BULLETIN OF THE FLORIDA STATE MUSEUM BIOLOGICAL SCIENCES Volume 4 Number 5 THE FRESHWATER DECAPOD CRUSTACEANS OF THE APALACHICOLA DRAINAGE SYSTEM IN FLORIDA, SOUTHERN ALABAMA, AND GEORGIA Honon H. Hobbs, Jr., and C. W. Hart, Jr. UNIVERSITY OF FLORIDA Gainesville 1959 The numbers of THE BULLETIN OF THE FLORIDA STATE MUSEUM, BIOLOGICAL SCIENCES, will be published at irregular intervals. Volumes will contain about 800 pages and will not necessarily be completed in any one calendar year. OLIVER L. AUSTIN, JR- Editor The publication of this number of THE BUL- LETIN has been made possible by a grant from the Graduate School, University of Florida. All communications concerning purchase or exchange of the publication should be addressed to tbe Curator of Biological Sciences, Florida State Museum, Seagle Building, Gainesville, Florida. Manuscripts should be sent to.the Editor of the BULLETIN, Flint Hall, University of Florida, Gainesville, Florida. Published 14 May 1959 Price fer this issue $.60 THE FRESHWATER DECAPOD CRUSTACEANS OF THE APALACHICOLA DRAINAGE SYSTEM IN FLORIDA, SOUTHERN ALABAMA, AND GEORGIA HORTON H. HOBBS, JR., AND C. W. HART, JR. 1 SYNOPSIS: Two families of freshwater decapod crustaceans frequent the lower Apalachicola drainage system. The family Palaemonidae is represented . by 2 shrimps of the genus Palaemonetes and the Astacidae by 21 crayfishes be- longing to the genera Procambarus (15 species), Cambarus (4), Orconectes (1), and Cambarellus (1). An illustrated key is provided for identifying these animals, and a tabular summary of their ecological distributions precedes an annotated list of species. The latter includes for each species a bibliographic synonomy, diagnostic characters, color notes, ecological data, range, life history notes, and a list Of crayfish ass6ciates. Locality records :in the area are indicated on ap- pended maps. Procambarus rogersi expletus, new subspecies, is described from Calhoun County, Florida. INTRODUCTION The area treated in this study is bounded on the West by the Choc- tawhatchee River; on the north by Henry County, Alabama, Clay, Calhoun, and Dougherty counties, Georgia; on the east by Dougherty, Mitchell, and Grady counties, Georgia, and Leon and Wakulla counties, Florida; and on the south by the Gulf of Mexico. Here occur almost half of the freshwater decapod crustaceans found within the political boundaries of the State of Florida-28 species and subspecies belonging to 5 genera. Some of the crayfish frequent the larger streams; others appear to be confined to a few '. small streams, while certain of them are apparently restricted to subsurface waters which they reach by burrowing, sometimes to a depth of more than 10 feet. The shrimp have invaded most of the permanent bodies of water except the smaller streams, and are fre- quently encountered in semiperm-anent aquatic environments. ' 1 Horton H. Hobbs, Jr. is Professor of Biology at the University of Virginia and Director of the Mountain Lake Biological Stati6n. His chief interest is in the taxonomy, ge6graphic and ecological distribfition of freshwater decapod crus- taedans. C. W. Hart, Jr. is a Research Associate in the Department of Limnology of tbe Academy of Natural Sciences of Philadelphia, and is also Editor of Scientific Publications of the Academy. He is particularly intere5ted in the taxonomy of ostratods and in the morphology of. crayfishes. These investigtitions were sup- ported in part by Research Grant No. G-942 from the National Science Founda- tion. Manuscript submilted 9 September 1958.-ED. 146 BULLETIN FLORIDA STATE MUSEUM Vol. 4 Within this area a wide diversity of habitats is available to the decapod stocks that have invaded it and, in spite of the slight vari- ation in topography, the development of diverse soil types in rela- tively small areas has resulted in swamp and marsh areas partially or completely isolated by well-drained soils. Many of the streams flow through areas that, because of the nearly xerie conditions pre- vailing adjacent to them, are accessible only to those crayfishes and ~ shrimps able to reach them by migrating upstream. Too, the lower Apalachicola River itself appears to have functioned as a barrier to certain species as effectively as xeric habitats. Thus it is apparent that barrier effects, insofar as these decapods are concerned, are just as efEcient in a monoton6us terrain as in regions with striking diversity of elevations. The importance of soil types becomes apparent when it is realized that in Florida the total variation in topographic relief ranges from sea level to approximately 500 feet, and the area of the State above 800 feet is small indeed. In Florida only along the Apa- lachicola River does one find a situation that recalls the deep shaded ravines so typical of the upper Piedmont and foothills of the Appa- lachian System, and it is of interest that only here are found a flora and fauna with so many upper Piedmont and southern Appalachian elements. The senior author's interest in the Apalachicola drainage system began when he first collected in the area.in 1984. Since then he has made many collections in the vicinity to ascertain its crayfish fauna. In September 1955 both of us spent 10 days in the area visiting as many localities as possible. This visit was initiated through the ac- tivities of a group of biologists aisociated with the Florida State Museum and the Department of Biology, University of Florida, and led by Dr, J. C. Dickinson, Jr. They became interested, upon learning of the proposed impoundment of the Flint and Chattahoochee rivers, in making a study of the flora and fauna that the lake resulting from the construction of the Jim Woodruff Dam would displace. A number of important contributions have been made to our knowl, edge of the fauna and flora of the region, most of which have been ~'CifUl'in tlie excellent study by Hubbell, Laessle, and Dickinson (1956). They hav6 0resented1 a comprehensive treatment of the physical fea- tures, .and . natural regions of the area together with a classification of the )hajor habitats. Since then Clench and Turner (1956) com- pleted a monographie study of the mollusks from the Escambia to the Suwannee River; and Berner (1958) has published a list of the mayflies of the lower. Apalachicola River Drainage. 1959 HOBBS AND HART: FRESHWATER CRUSTACEANS 147 The history of work on the crayfi5hes of this area is indeed brief, dating back only to 1988 when the senior author described Cambarus rogersi (now Procambarus rogersi) from the Apalachicola flatwoods near Blountstown. The bibliography at the end of this paper cites all the subsequent work published on the subject to date. THE QRIGB- OF THE FAUNA The region under consideration lies wholly within the Coastal Plain province, and although opinions differ as to how long it has been above sea level (c.f. Cook 1945 and Goin 1958), almost certainly some of it was inundated as recently as the latter part 6f the Pleisto- cene. With the retreat of the sea three principal highways seemed to have been opened to the decapods: (1) The confluence of the Flint and Chattahoochee rivers to form the Apalachicola provided a route for the Piedmont fauna to reach the Florida panhandle. (2) The second route from the northeast developed along the Ochlockonee drainage system and allowed the Coastal Plain fauna in southeastern Georgia to move into the coastal Ratwoods of the panhandle. (8) The third route, from the northwest, provided a highway for stocks moving southeastward from Alabama into the panhandle. In spite of the fact that the molluscan fauna is apparently derived totally from a northwestern stock (Clench and Turner, 1958: 108), considerable in- terest and importance attaches' to the. role that these three routes have played in the population of the Apalachicola region, for not only does an examination of them shed light oh the evolution of the several decapod stocks, but also should contribute to an understanding of the origin and ,evolution of much of the biota of the, area. The erayfishes and shrimps of the Apalachicola drainage system represent 10 somewhat closely related groups, and only 2 species are endemic to the region, the others being found in other drainage systems. East of the developing Apalachicola River the Ochlockonee sys- tem paralleled to some degree the developing Flint River. This re- sulted in a well-drained area between the two and, except for the possibility of stream piracy developing in the intervening area, there could have been little opportunity for the faunas of the two systems to mix. Only in the continuous flatwoods between the lower reaches ~ of these two streams could decapods have migrated from one stream to the other. Immediately west of the Apalachicola River the land is drained chiefly by the Chipola River which rises· in the southeastern part of 148 BULLETIN FLORIDA STATE MUSEUM Vol. 4 Alabama.and joins the Apalachicola some 25 miles above its mouth. Between these two rivers, and particularly in Alabama and northern Florida, the land lies at a relatively high elevation with few streams. Even though the Chipola is a small stream it has undoubtedly facili- tated the migrations of several stocks now found in the coastal flat- woods. Of the 6 crayfishes that have apparently invaded the region from the north along ihe Flint and Chattahoochee rivers, 8 are primarily stream dwellers. One, Procambarus paeninsulanus, is somewhat ubi- quitous 2 and two, Cambarus #oridanus and C. diogenes, are burrow- ing species that excavate complex burrows in the immediate vicinity of streams. Of the stream-dwelling species, one representative, C. latimanus, typically a Piedmont form, is f6und in a few localities in the deep ravines along the east side of the Apalachicola River in Florida as well as in a few places in the Flint and Chattahoochee drainages below the Fall Line in Georgia and Alabama. Another, P. spiculifer, occurs in most of the major river systems in Alabama, Georgia, and northern Florida, both in the Piedmont and Coastal Plain provinces. The third, P. venutus, has been found in only a single locality in the area, a small brook in the Apalachicola Bluffs. It occurs abundantly in streams to the west and northwest, and the small population here is probably a relict one. It is so considered because it is known elsewhere in the drainage from only two localities near Phenix City, Alabama, and it is assumed that these are the only ones where the species, once widely dispersed in this drainage system, has survived to the present. Of the burrowing species, C. diogenes is found from New Jersey and the Great Lakes southwestward to Texas. The other, C. /loridanus, appears to be confined to the Apa- lachicola and the Ochlockonee systems. Procambarus paeninsulanus frequents most aquatic habitats from the Choctawhatchee River east- ward to the Atlantic Ocean.. Whereas representatives of only two crayfish genera entered the region from the north along the Apalachicola River, representatives of three appear to have arrived from the northwest. The only stream- dwelling species in this group is the pigmy erayfish, Cambarellus schmitti, which is found in springs and streams from southern Ala- bama to the northern part of the peninsula of Florida. In the flat- woods in temporary lentic and lotic situations occur fve species that 2 The word ubiquitous is here' used to designate a broad ecological tolerance, and is applied to those species that frequent leritic and lotic habitats as well as burrows. 1959 HOBBS AND HART: FRESHWATER CRUSTACEANS 149 dig shallow burrows during seasons of drought. Orconectes clupeatus is found from Oklahoma to South Carolina, C. fodiens from Ontario southward and eastward through the upper Mississippi basin to Geor- gia, and the remaining three, P. latipleurum, P. apalachicolae, and P. hubbelli have small ranges in the region, latipleurum being en- demic to the Apalachicola drainage system. The remaining species that appears to have arrived in the area from the northwest is P. pycnogonopodus, another ubiquitous form found abundantly in the western drainage of the Apalachicola River in Florida. Only one genus, Procambarus, is represented by the erayfish stocks that arrived in the Apalachicola region from the northeast. From one of them arose two burroiving species, P. rogersi and P. Pygmaeus. The rahge of rogersi is largely restricted· to this area; that of pygmaeus is apparendy discontinuous, records having been established in iso- lated localities on both sides of the Apalachicola River and in the vicinity of the Okefenokee Swamp. Another northeastern stock is represented by P. kilbt,i, a secondary burrower (see below) which rangeg through the coastal flatwoods from the Apalachicola drainage system eastward to Levy County, Florida. From the other two stocks arose the ubiquitous P. leonensis, the range of which extends from the eastern tributaries of the Apalachicola River to the Suwannee River, and the stream-dwelling, endemic P. youngi. Of the two species of shrimps in the area, Palaemonetes kadiaken- sis seems to have arrived from the northwest and P. paludosus by far more abundant in the area, fr6m the northeast. The hypogean crayfishes, Procambarus pallidus (Hobbs, 1940:' 394) and Cambarus cryptodytes Hobbs (1941: 110), known respectively from sinkholes in the Tallahassee region and fr6m a well two miles south of Graceville, Jackson County, Florida may eventually be found with- in the area; however, they have not been included in this rep6rt. KEY TO THE DECAPODS OF THE AREA 1 Rostrum compressed, with a row 65 spines above and at least one or , two below'(figs. 1, 8) Third pair of walking legs not chelate.______.......__ Palaemnniclae (shrimp) 1' Rostrum depressed, never with a row of spines above (fig. 5) Third pair of walking legs chelate:..._.-__ __.._...._-_.-___.___.-__Astacidae (crayfish) KEY TO PALAEMONIDAE 1 Branchiostegal spine located on anterior margin of carapace immediately below the branchiostegal groove (fig. ' 1). Posterior pair of dorsal spines 150 BULLETIN FLORIDA STATE MUSEUM Vol. 4 on telson 15'ing midway between anterior pair and caudal margin of telson __.- -- Palaemonetes (Palaemonetes) paludosus 1' Branchiostegal spine lying behind anterior margin of carapace and below the branchiostegal groove (fig. 3) Posterior pair of dorsal spinei on telson lying almost on caudal margin of telson, sometimes in a line with the ter- minal spines (fg. 2) --_-__Palaemonetes (Palaemonetes) kadiakensis THE SHRIMP We have observed only two species of freshwater 5hrimp in the area and, while they are abundant in certain places, no systematic attempt has been made to record all the localities from which they have been collected. They cannot be separated reliably without some magnification to see the diagnostic characteristics given in the key. The number of spines on the rostrum varies, but the predomi- nent numbers are indicated in Bgures 1 and 8. Palaemonetes (Palaemonetes) paludosus (Gibbes) (Figures 1 and 4) Hippolyte paludosa Gibbes 1850, Proc. Amen Ass. Adv. Sci., 8: 197. Palaemonetes exilipes Stimpson 1871, Ann. Lyc. Nat. Hist., N. Y., 10: 180. Palaemonetes (Palaemonetes) paludosus Holthuis 1949, Koninklijke Nederlandsche Akademie van Wetenschappen, 52 (i): 7. This species is abundant in the lower Piedmont and Coastal Plain provinces from New Jersey to Florida. It has also been reported from Mississippi, L6uisiana, Oklahoma, and Texas. Palaemonetes (Palaemonetes) kadiakensis Rathbun (Figures 2 and 8) Palaemonetes kadiakensis Rathbun 1902, Proc. U. S. Nat. Mus., 24: 908. Palaemonetes (Palaemonetes) kadiakensis Holthuis 1949, Koninklijke Nederlandsche Akademie van Wetenschappen, 52 (1): 8. According to Holthuis (loc. cit.) this species occurs in the "fresh- waters of Central U.S.A. west of the Alleghenies from the Great Lakes to the Gulf coast, also in S. Ontario (Canada) and N. E. Mexico". Although it is not rare in this area, it is not so common as P. paludosus. 1959 HOBBS AND HART: FRESHWATER CRUSTACEANS 151 KEY TO ASTACIDAE 1 Male 22 I' Female - -- -- ----- 2 2(1') Annulus ventralis freely movable-not fused wih sternum anterior to it · _ '__.- 6 2' Annulus ventralis only slightly movable-fused with sternuman- terior to it (.nm.1121/Im 8 8(2',23) Areola linear or obliterated (fig. 35) 4 8' Areola narrow or broad but never reduced to a line (fig. 6) ________ 5 4(8) M6v'able finger of chela with a distinct excision on opposable mar- gin; fingers concolorous, not red-tipped (fig. 11) -__________C. fodiens 4' Movable finger with no well-defined excision on opposable mar- gin ; fingerS red-tipped (fig . 10) C . diogenes 5(8') Areola with three. or four punctations across narrowest part; color brownish or greenish gray C. latimanus 5' Areola with only one or two punctations across narrowest part; color reddish purple or red C floridanus 6(2) Mesial surface of carpus (Eg. 7) of cheliped without a prominent tubercle or spine, except sometimes on distal margin; Fostrum with- Out lateral spines or tubercles ...OrcOnectes dypeatus 6' Mesial surface of carpus of cheliped with a prominent tubercle or spine, 6r if without, then fostium always bears lateral spines or tubercles - - · - .. ~ .- ··- - 7 7(6') Sclerite between fifth walking legs in the form of an acute triangle; adult individuals never more than one inch in length -- - ______ 60nbarellus schmitti 7' Sclerite between fifth Walking legs variable ih shape but never in the form of an acute triangle; adult individuals always more. than one inch in length ~ 8 8(7') Lateral surface of carapace with two spines on each side immedi- ately behind cervical groove 9 8' Lateral surface of carapace without or with only one spine on each side immediately behind cervical groove 10 9{8,81) Spine present on mesial margin of basipodite of cheliped (fig. 9sb) ---Procambarus versutus 9' No spine present on me5ial margin of basipodite of cheliped ____ - - . P spicutifer 10(8') Palm of chela flattened (depressed) with a cristiform row of tubercles on inner margin (fig. 80) _- . · - r n n- - · -- - 11 10' Palm of chela not conspicuously depressed and never with a single cristiform row of tubereles on inner margin - 15 11(10) Annulus ventralis distincily longer than wide___P. rogersi ochlocknensis 11' Annulus ventralis either broader than 16ng or with. the two dimen- sion5 subequal in length 12 152 BULLETIN FLORIDA STATE MUSEUM Vol. 4 12(11') Annulus veritralis distinctly broader than long and without con- spicuous tubercles anteriorly ..............._-_...__......_--_.....P . rogersi Togersi 12' Annulus ventralis with length and width subequal or with con- spicuous tubercles anteriorly 18 13(12') Annulus ventralis without tubercles anteriorly; carapace green with scarlet markings P pygmaeus 13' Annulus ventralii with tubercles anteriorly (Eg. 37); carapace purplish red 14 14(13') Inner margin of antennal scale evenly rounded (fig. 89) _-_.-_-- --_-_ P rogersi expletus Explanation of Figures 1-11 Figure 1. Lateral view of anterior portion of Paldemonetes paludosus. Figure 2. Dorsal view of telson of Palaemonetes kadiakensis. Figure 8. Lateral view of anterior portion of Palaemonetes kadiakensis. Figure 4. Dorsal view of telson of Palaemonetes paludosus. Figure 5. Lateral view of carapace of Procambarus voungi. Figure 6. Dorsal view of carapace of Procambarus Youngi Figure 7. Dorsal view of distal three podomeres of cheliped of male of Pro- cambarus youngi. Figure 8. Dorsal view of chela of male of Procambarus hubbetli Figure 9. Ventral view of proximal podomeres of left cheliped and second walking 16g of Procambarus versutus. Figure 10. Movable finger of chela of Cambarus diogenes diogenes. Figure 11. Movable finger of chela of Cambarus fodiens. Abbreviations Used ar-areola as-anterior dorsal spihe B-1-basipodite of cheliped (first walking leg) 8-2-basipodite of second walking leg bg-branchiostegal groove bs-branchiostegal spine , C-1--coxopodite (coxa) of cheliped (first walking leg) C-2-coxopodite of second walking leg car-arpus ex-xcision I-1-Ischiopodite of cheliped (first walking leg) I-2-Ischiopodite of second walking leg lsi-lateral spine on carapace 1sr-lateral spine on rostrum mf-movable finger plm-palm of chela ps-posterior dorsal spine s-spine sb-spine on basipodite 1959 HOBBS AND HART: FRESHWATER CRUSTACEANS 158 S bs 26g PS bs dsbg 3 4 ls< Isr Isc mf 5 ISC Pim 1-1Or S 6 8-1 cor 7 0-1 0 8-2 C- -8 9 154 BULLETIN FLORIDA STATE MUSEUM Vol. 4 14' Anterior half of inner margin of antennal scale straight_........___.... P rogersi campestris 15(10') Areola at least one-third as broad as long and acumen as long as remainder of rostrum (fg. 6) P. youngi 15' Areola always less than one-third as broad B long and acumen never as long as remainder of rdstrum 16 16(15') Lateral spines present on carapace and usually on margins of ' rostrum (fig. 6) 17 16' Lateral spines lacking on carapace and seldom present on rostrum__. 19 17(16) Surface of. annulus ventralis subplane except for sinuous sinus P paeninsulanus 17' Surface of annulus ventralis not flat but bearing prominences or ridges 18' 18(17') Annulus ventralis usually with a broad trahs*erse furrow (east of the Apalachicola River) -- - P leonensis 18' Annulus Ventralis usually with a median longitudinal elevation (west of the Apalachicola River) -_____________...__-.-__...-...P. P!/cnogonopodus 19(16') Anterolateral surfaces of annulus yentralis with spines or tubercles 20 19' Anterolateral surfaces af annulus ventralis without spines or tubercles 21 20(19) Rostrum acute lanceolate ·» - P latipleunim Explanation of Figures 12-26 First left pleopods of. first form males. All are lateral views except figures 14-16 and 25 which are caudal views. Pubescence is not indicated in any of the pleo- pods illustrated. , Figure 12. Procambarus leonensis. Figure 13. Procambarus pugmaeus. Figure 14. Procambarus rogersi rogersi. Figure 15. Procambarus rogersi ochlocknensts. Figure 16. Procambarus rogersi campestris. Figure 17. Procambarus pucnogonopodus, Figure 18. Procambarus paeninsulanus. Figure 19. Procambarus kilbyi Figure 20. Procambarus apalachicolae. Figure 21. Procambarus latipleurum. Figure 22. Procambarus uersutus. Figure 23. Procambarus. spiculifer. Figure- 24. Cambarus floridanus. Figure 25. Orconectes cl!/peatils. Figure 26. Procambarus youngi. Abbreviations Used ck-audal knob cp-cephalic process cpj-central projection ml-mesial process 1959 HOBBS AND HART: FRESHWATER CRUSTACEANS 155 mp c~ 4 cp} mp cs) ck 12 13 14 15 16 P mp 17 18 19 20 21 L 22 23 24 25 26 156 BULLETIN FLORIDA STATE MUSEUM Vol. 4 20' Rostrum broadly ovate · P apalachicolae 21(19') Dorsal surface of carapace and abdomen usually with a light median longitudinal band (Apalachicola drainage system and eastward)....P. kilb{/i 21' Dorsal surface of carapace and abdomen speckled; adults never with a light median longitudinal band (Choctawhatchee drain- age system) - P. hubbelli 22(1) First pleopod terminating in two parts that if not markedly unequal in length are bent posteriorly at at least right angles to the main shaft of the appendage (figs. 24,25) 28 22' First ·pleopod terminating in two or more conspicuous parts; if only two, then subequal in length and never bent posteriorly at as much as at right angles (figs: 12-28, 26) - - --- 24 28(22) Tips of first pleopod consisting of one short and one long ramus ( fig . 25)..-- -- m-- ----i .__.__Orconectes clypeatus 28' ~ Tips· of first, pleopod consisting of two rami of subequal length bent approximately at right angles to the main shaft of the append- age (Bg. 24) Cnmhnm.q 8 24(22') Hooks present on ischiopodites (third joint from base) of second and. third pereiopods -_......_..._.........-....._-_-_-_-__......Cambarellus schmitti 24' Hooks present on ischiopodites of third (fig. 86) or third and fourth perei6pods 25 25(24') ' Hooks present on ischiopodites of third pereiopods only ..........__--- 26 25' Hooks present on ischiopodites of third and fourth pereiopods ........ 31 26(25) Palm of chela flattened and with a cristiform row of tubercles along inner margin (fig. 80) 27 26' Palm of chela not flatttened, never with a cristiform row of tubercles, and usually with a consDicuous· tuft of plumose setae along inner margin (fig. 8) Procambarus hubbetli 27(26) Caudal knob of first pleopod conspicuous (figs. 14-16, 84) __--_.-_--- 28 Explanation .of Figures .27-39 Procambarus Togersi expletus, subsp. nov. Figure 27. Mesial view of first pleopod of holotype. Figure 28. Mesial vie# of first pleopod of morphotype. Fihure 29. Lateral view of carapace of holotype. Figure 30. Upper surface of distal three podomeres of cheliped of holotype. Figure 81. Lateral view of first pleopod of morphotype. Figure 82. Lateral view of first pleopod, of holotype. Figure 38. Cephalic view of distal portion. of flrst pleopod of holotype, Figure 84. Caudal view of distal portion of first pleopod of holotype. Figure 85. Dorsal view of carapace of holotype. Figure 86. Basipodite and Ischiopodite of third pereiopod of holotype. Figure 37. Annulus ventralis of allotype. Figure 38. Epistome of holotype. Figure 89. Antenhal scale of holotype. 1959 HOBBS AND HART: FRESHWATER CRUSTACEANS 157 - . , f. rf ~..b:· ~ : .' ,·. ./ f ],»2'#- 1- 29 ' 7 . p f .VE r * ·-2 28 3127 32 30 33 ,,-11----h. 34 S - ty - - -4 - 1 39 35' 36 37 38 158 BULLETIN FLORIDA STATE MUSEUM Vol. 4 27' Caudal knob of first pleopod vestigial so that only two terminal ele- ments are apparent (fig, 18) . P pygmaeus 28(27) Caudal knob bent mesially at a right angle to the main shaft of the appendage, ( fig . 14) P TOgersi Togersi 28' Caudal kn6b bent no more than at a 45 degree angle to the main shaft of the appendage (figs, 15, 16, 84) 29 29(28') Inner margin of antennal scale evenly rounded (fig. 89) --- - P. rogersi expletus 29' Anterior half of inner margin of ante-nnal scale straight ____...__._... 80 80(29') Plate-like central projection of first pleopod directed obliquely eau- dad across cephalic border of tip, cephalic process present (4 15) P rogersi ochlocknensis 80' Plate-like central projection of first ple6pod directed laterad across cephalic border of tip, cephalic process rudimentary or absent (fig. 16) P Togersi campestris 81(25') Lateral surface of carapace with two spines on each side __..........__ 9 31' Lateral surface of carapace. with only one spine on each side (fig. 5) 82 82(31') Areola at least one-third as broad as long and acumen as long as . remainder of rostrum (fig. 6) P youngi 32' Areola always less than one-third as broad as long and acumen never as long as remainder of rostrum 88 38(32') Areola less than one-fifth as broad as long 84 88' Areola at least one-fifth as broad as long - 86 34(83) First left pledpod with a conspicuous angular prominence on ceph- alic margin (fig. 18) P paeninsulanus 34' First left pleopod without an angular prominence on cephalic margin (figs. 12, 17) 35 85(84') Distal portion of first pleopod somewhat taperihg and directed caudodistad (fig. 12) P Zeonensia 35' Distal portion of first pleopod not tapering, and directed distad (Eg. 17) P · pycnogonopodus 86(88') Mesial process of first pleopod heavy, subspatulate, and diretted cauddd (fig. 19) --· -v P kilbyi 86' Mesial process slender and never directed caudad (figs. 20, 21) __ 37 37(36') Mesial process subspiculiform and curved cephalad (fig. 21) P latipleurum 87' Mesial process slender, but not so spiculiform, and directed caudo- distad (Rg. 20) P apalachicolae 1959 HOBBS AND HART: FRESHWATER CRUSTACEANS 159 SUMMARY OF ECOLOGICAL HABITS AND HABITATS OF THE CRAYFISHES A-Species that Occur in Burrows The burrowing forms show three somewhat different relationships to the burrowing habit, indicated by: P-primary (restricted to bur- rows); S-secondary (generally occupying burrows but wandering into open water during rainy seasons); and T-tertiary (burrowing only when the aquatic basin becomes dry, or occasionally, but not necessarily, as its breeding period approaches). I. Burrowing in Seepage Areas [Bayheads and Bogs, Hubbell et al., 1956: 84, 86] P. Togersi rogersi P C . latinumui S P . Togersi expletus P C . #oridanus P P. Fogersi ochlocknensis P C. diogenes P or S P. rogersi campestris P II. Burrowing in Flatwoods [Slash Pine Flatwoods-Marginal thicket type and Pitcher-plant type, Hubbell et al., 1956: 85] P. TOgersi Togersi P P. hubbelli S P. rogersi expletus P P. apalachicolae S P. rogersi ochlocknensis P P. latiplewum S P. rogersi campestris P P. kilbyi S P . paeninsulanus T P. leonensis T P. pycnogonopodus T P. pygmaeus P or S 0. clypeatus S or T III. Burrowing in Floodplains of Large Streams [Alluvial Swamps, Huibell et al., 1956: 83] C. diogenes P-S C. #oridanus P IV. Burrowing in Banks 6f Streams P. hubbelli S P. uersutus T P. paeninsulanus T C. diogenes P-S P. kilbyi S C. latimanus S P. spiculifer T . C. fodiens S C. floridanus P V. Burrowing in Drying Ponds or Ditches [Cypress Ponds, Hubbell et al., 1956: 83] 160 BULLETIN FLORIDA STATE MUSEUM Vol. 4 P. hubbelli S P. pyonogonopodus T P. kilbyi S P. leonensis T P. apalachicolae S P. pygmaeus P or S P. Zatipleurum S 0. 04/peatus S or T P. paeninsulanus T C. fodiens S B-Species Occasionally or Usually Found Outside of Burrows I. Inhabiting Ponds, Lakes, and Ditches. L-permanent lakes or ponds; T-temporary-or fluctuating ponds or ditches C Including Cypress Ponds; Hubbell et al., 1956: 38] P. hubbem T P. apalachicolae T P. kilbyi T P. pycnogonopodus L-T P. leonensis· L-T P. paeninsulanus L-T 0. 04/peatus T P. paludosus L (shrimp) II. Inhabiting Lotic Situations. A-ravine brooks; I-intermittent streams; B-rivers, creeks, and brooks not in deep ravines. P. kilbyi I P. versutus A P. leonensis I-B P. youngi B P. P!/cnogonopodus--I-B P. pugmaeus I P. paeninsulanus I-B C. schmitti B P. spiculifer A-B 0. clypeatus I C. latimanus A P. paludosus I-B (shrimp) P. kadiakensis B (shrimp) III. Inhabiting Sluggish Streams and Sloughs. P. kilbyi P. paeninsulanus P. hubbelli · 0. clypeatus P. Zeonensis C. schmitti P. pycnogonopodus P . paludosus (shrimp) P. kadiakensis (shrimp) ANNOTATED LIST Both the keys and the diagnostic characters have been designed for the recognition of the crayfishes and shrimps of this area, and should not be utilized' to identify or to confirm an identification of specimens collected outside of the region. Notes on color and ref- ' erences to the habits 6f the several species are. insofar as we are aware, applicable to any localities where the animals are found. 1959 HOBBS AND HART: FRESHWATER CRUSTACEANS 161 Life history notes and the list of crayfish associates apply only to the erayfishes collected in the general region and not throughout the fange of each species or subspecies. The maps indicate the distribution of each of the crayfishes in the area; exact locality data are given only for those species that are known from only a few localities. In the Life History Notes reference is made to "first form males". 5, "These are breeding males as opposed to second form males which are adult but apparently incapable of transferring sperm to the fe- male. The first form male may be distinguished from the second by the presence of at least one comeous apical proc,~s on the first abdominal appendage, pleopod, whereas none of them is corneous in the second form male. Those species, some of the habitats of which have been or prob- ably will be affected by the impoundment of the Jim Woodruff Dam are P. spiculifer, P. paeninsulanus, O. clypeatus, C. latimanus, C, Fori- danus, C. fodiens, and C. diogenes. Procambarus youngi Hobbs (Figures 5,6,7,26; Map 6) Procambarus youngi Hobbs 1942, Univ. Fla. Pub., Biol. Sci. Ser., 8 , (2): 181, 15 Bgs. This species is known from Only three localities, one each iIi the drainage systems of the Chipola River, St. Marks River, and Wetappo Creek (see below). Further collecting in the permanent streams in the Apalachicola flatwoods and bordering uplands should be under- taken to determine whether Or not this species is as limited in its distribution as it appears to be. DIAGNOSTIC· CHARACTERS.-A combination of the acumen Of the rostrum being subequal in length to the remainder of the rostrum, the areola comprising one-third of the length of the carapace, and, in the male, the length of the inner margin of the palm of the chela being longer than that of the m6vable fnger is sufficient to distinguish this crayfsh from any other. COLOR NOTES.-Not available. ECOLOGICAL OBSERVATIONS.-The type locality, Guard House Branch, is a small clear stream flowing through gently sloping flat- woods. Wetappo Creek is a somewhat larger stream that is fre- quently coffee-colored, and the St. Marks River is a large spring-fed stream, crystal-clear except during periods of heavy rains when it, 162 BULLETIN FLORIDA STATE MUSEUM Vol. 4 too, becomes somewhat coffee colored. In the larger streams P. · youngi was found only in the littoral areas among the vegetation and debris. KNOWN LOCALITIES.-Florida, Gulf County: Guard House Branch, 1 mile west of Weewahitchka, on State Highway 22 (old no. 52); 6.4 miles east of Bay County line on State Highway 22. Wakulla County: St. Marks River, 6.8 miles east of Woodville. LIFE HISTORY NOTEs.-First form males have been collected in April, September, and November. No females with eggs or young have been observed. CRAYFISH ASSOCIATES.-P. paeninsulanus, P. spiculifer, and C. schmitti. Procambarus spiculifer (LeConte) (Figure 28; Map 2) Astacus spiculifer LeConte 1856, Proc. Acad. Nat. Sci., Philad; 7: 401. Cambarus spiculifer Hagen 1870, Illus. Cat. Mus. Comp. Zool., Har- vard Coll., (3): 9. Procambarus spiculifer Hobbs 1942, Amen Midi. Nat., 28 (2): 842 (by implication). Procambarus spiculifer is the largest and one of the most abundant species in the area. Its range has been recently reviewed by Hobbs (1958: 416) who reported it to inhabit streams from the headwaters of the Chattahoochee River south to the Suwannee River in Florida and west to Mobile County, Alabama. In Alabama it is not known to ~ occur north of a line drawn from Washington County to Lee County. DIAGNOST[C CHARACTE:RS.-The presence of two lateral spines on each side of the carapace and the absence of a spine from the mesial margin of the basipodite of the cheliped will distinguish this crayfish from any other in the area under consideration. COLOR NOTES.-This is the most strikingly marked species in the area, and while the actual colors vary considerably, the patterns of the markings are remarkably constant in those individuals that fre- quent the Apalachicola drainage system. The most conspicuous of these markings is a dark longitudinal band on each side of the cara- pace which extends dorsally at the posterior margin Of the carapace toward the corresponding band on the opposite side; a conspicuous gap separates the two bands. In addition other dark patches and bands are symmetrically arranged on the carapace. The ground color varies from light tan and dark brown to bluish green; the chelae ALABAMA GEORGIA ALABAMA GEORGIA 1959 H O BBS A N D H A R T: FR E S H W ATE R C B U S TA C E A N S 168 CLAY HENRY % CLAY - 9 ~.£]DALE EARLY CAL UN T DOU , BAKER 0 EARLY 0 BAKER - MLLER kz- - ~OUSTON )ILLER .,0, 0./' M TCHELL 0 DECA GRADY 0 DECA / . ITCHELL SEMINOLE / ALAS*4A GRADY ~ FLORIbA I / FLORIbA~ JACKSON ACKSON .0 GEORGIA GEORGIAA & FLORIDA LEONLEON INGT 1 WASHINGTDN FLORIDA 00 , /. .... 0 A . i.eak„ I WAKULLA I WAKULLA .71 - | LIBERTY * ,~ LIBERTY 'GULF ; FAA KLIN 'GULF . FRI KLIN C:P. Ilonens'., .*sploullfer A,R pyanogonopodus <0/ «U:/ GULF OF MEXICO ' GULF OF MEXICO MAP I MAP 2 164 BULLETIN FLORIDA STATE MUSEUM Vol, 4 are usually dark with red-tipped fingers and with cream-colored tubercles. Red splotches are present on the epimera of the abdominal segments. ECOLOGICAL OBSERVATIONS.-Procambarus spiculifer appears to be confined to lotic habitats and is the only erayfish that has been taken from the rivers in the area. "The size of the stream is not of primary importance-almost any well areated, lotic situation which the cray- fish can reach by suitable highways is likely to be occupied. P. spic- ulifer has never been collected in standing water, and only rarely haye I taken it from the still reaches of a stream. ...In the ravines along the Apalachicola and Ochlocknee rivers where small springs and seepage areas combine their waters to form small creeks, spiculifer is abiindant, although it does not seem to invade the shallow head- waters. In these streams the water is vefy clear and cool, ·and usually flows with a moderate current over a sand or clay bottom Hobbs 1942b: 128,124). While this species does not appear to penetrate the headwaters of the small creeks in the ravines south of Chattahoochee, it is found in the small headwater brooks to the north as well as in those streams flowing into the Ochlockonee River in Decatur County, Georgia and Gadsden County, Florida. The presence or absence of vegetation in the stream appears to have little effect on the popula- tion. Frequently specimens are more easily obtainable where aquatic vegetation is abundant, but some of the largest populations were en- countered in streams totally devoid of aquatic vascular plants. Some kind of cover, whether it be an undercut bank, vegetation, or debris, is always associated with a sizable population. In streams affording few places for concealment. the population is always small. Whereas P. spiculifer does not burro* to the extent that many of the species in the area do, it does dig shallow horizontal tunnels into the banks of streams, and many of the larger specimens 'have been taken from such tunnels during the day. In most places larger series of specimdns may be obtained from the open water at night when the animals leave their places of concealment. LIFE HISTORY NOTES.-First form males have been collected in every month of the year, and while there are few records of females with eggs, they have been observed in January, March, and August. CRAYFISH ASSOCIATES.-P. youngi, P. paeninsulanus, P. leonensis, P. pycnogonopodus, P. kilbyi, 0. clt/peatus, C. schmitti, C. diogenes, C. Boridanus, C. latimanus. and C. fodiens. 1959 HOBBS AND HART: FRESHWATER CRUSTACEANS 165 Procambarus versutus (Hagen) (Figures 9,22; Map 5) Cambarus uersutus Hagen 1870, Illus. Cat. Mus. Comp. Zool., Har- vard Coll., (3): 51. Procambarus uerautus Hobbs 1942, Amen Midi. Nat., 28 (2): 842 (by implication). The easternmost limit of the range of this species occurs in the Apalachicola drainage system, and in its lower reaches is known from a sjngle stream, Little Sweetwater Creek in Liberty County, FJorida. Its range extends fr6m Mississippi eastward to the Apalachicola drain- age systern. 'DIAGNOSTIC CHARACTERS.-The presence of two lateral spines .on ' each side of the carapace and the presence of a spine on the mesial margin of the basipodite of the cheliped will distinguish this erayfish from any other in the region. COLOR NOTES.-Like its close relative, P. spicillifer, this crayfish is strikingly colored. The most conspicuous markings are found on the carapace; on its tan background a brick-red longitudinal band on each side extends dorsally from the posterior margin of the carapace toward the corresponding band on the opposite side. Another brick- red longitudinal stripe extends along each side just ventral to this one, separated from it by a cream stripe. Additional red and cream markings are symmetrically arranged. The chelipeds are reddish brown with black tubercles. ECOLOGICAL OBSERYATIONS.-P. uersutus, insofar as known, has never been found in lentic situations, and it appears to be most abund- ant in small, sand-bottomed, spring-fed streams. In such habitats it occurs under the undercut banks or in clumps of debris. In streams containing Vallesneria, Potomageton, and other aquatic plants P. versutus may occur in large numbers. In Little Sweetwater Creek it was taken, near the headwaters whefe the depth of the water was no more than 3 inches. Although efforts were made to locate this species in other ravine streams in the Apalachicola Bluff area, this is the only place it was found. KNOWN LOCALmES.-Headwater ravine tributary to Little Sweet- water Creek near Rock Bluff, Liberty County, Florida, and several 16calities in Washington County. LIFE HISTORY NoVES.-First form males have been collected every month of the year except January, February, July, and November. ALABAMA GEORGIA ALABAMA GEORGIA g HENRY j CLAY f/' r HENRY ~ 'CLAY ..,- , / Dou TY 0 EARLY CAL UN 7 DOUG TY 9 / BAKER #OU TON hILIER - ~HOU~TON a¢ILLER , , ~ MITCHELL ,~ ~ L~ \ , MITCHELL ALABAMA DECA UR/ GRADY ALABAMA 0 DECA 7'' aney < SEMINOLESEM:NOLE FLORIDA ./ JACKSON . ~ ~' ~0 7 JACKSON A GEORGIA LEON -1--- 1 LEON IT-Il 5 / •6ADSD~N ~ FLORIDA I \ /•6ADS06'1 ~ FLORIDA rWASHINGTON B U LLE T IN F LO R ID A S TATE M U S E U M Vol. 4 0. ~ CALH N CALI 07- /1. WAKULLA BAY WAKULLA 0 . .AY <\ \. 0.. % ; LIBERTY1 LIBERTY / A R hubbelli .1 AP tallpleurum ® Rki b,1 0 R poeninsulon. 14/ ~ G,,chmittl <24/ GULF OF MEXICO GULF OF MEXICO MAP 3 MAP 4 1959 HOBBS AND HART: FRESHWATER CRUSTACEANS 167 Only in April and June have females with eggs been found, and the single, female that was found with young attached to the pleopods was collected in April. CRAYFISH ASSOCIATES.-No ~ other crayfishes were collected in the single locality where P. versutus is known to occur in this region. In the Choctawhatchee drainage system in the southwestern part of Washington County it was associated with C. diogenes. Procambarus leonensis Hobbs (Figure 12; Map 1) Procambarus leonensis Hobbs 1942, Univ. Fla. Publ., Biol. Sci. Ser., 3 (2): 114, figs. 121-125; Hobbs 1948, Proc. Fla. Acad. Sci., 6 (1): 49, 12 figs. Procambarus leonensis frequents both lentic and lotic habitats be- tween the Apalachicola and Suwannee rivers in Florida; however it does not appear to be abundant in the Apalachicola drainage system. Perhaps this is not actually true, for very little collecting has been done in the southern part of Liberty and the western part of Franklin counties, Florida. DIAGNOSTIC CHARACTERS.-The only reliable criterion for recog- - nizing this species is the structure of the terminal elements -of the first pleopod of the male. A single small lateral spine or tubercle is present on both sides of the carapace and the pleopod tapers distally, is somewhat recurved, and bears four terminal "teeth", two of which are spine-like, one subspatulate and corneous (in the first form male), and the fourth vestigial iii the form of a small tooth lying caudal to the subspatulate element. Hooks are present on the ischiopodites of the third and fourth walking legs of the male. COLOR NOTES.-P. leonensis is rather drab when compared with P. spiculifer or P. versutus,· its greenish brown background shows darker irregular ' markings dorsally and lighter markings laterally, and usually two pairs of black spots on the dorsolateral surfaces of the' branchiostegites. The legs are usually bluish green and in mature specimens the chelipeds are often conspicuously brownish orange on the lower surface. EcoL0GICAL OBSERVATIONS.-Procambarus Zeonensis is the sole in- habitant of many of the sinkhole ponds in the limestone sections of its range, and is the only species known to inhabit many of the - larger lakes in the Tallahassee region. It has also invaded most of 168 BULLETIN FLORIDA STATE MUSEUM Vol. 4 the streams, roadside ditches, and swamps throughout the extent of its range. Individuals living in temporary bodies of water construct during dry seasons simple burrows, which may or may not reach the water table, and where they remain until the ground water rises once again to fill the ditches or ponds. LIFE HISTORY NOTES.-First. form males have been collected in January, April, 'May, June, August, September, November, and De- cember. Females with eggs were found in April, May, August, and September. CRAYFISH ASSOCIATES.-P. kilbyi, P. rogersi campestris (and inter- grades), P. pygmaeus, P. spiculifer, P. paeninsulanus, and O. clypeatus. Procambarus pycnogonopodus Hobbs (Figure 17; Map 1) Procambarus pycnogonopodus H6bbs 1942, Univ. Fla. Publ., Biol. Sci. Ser., 8 (2): 117, figs. 126-180;. Hobbs 1948, Proc. Fla. Acad. Sci., 6 (1): 58, 15 Bgs. This species occurs in most bodies of water in which collections have been made between the Apalachicola and Yellow rivers in Flor- ida and, while it has not been encountered in the Flint-Chattahoochee region, it is abundant in streams flowing into the Apalachicola in' Cal- houn County, Florida. It has not been reported from the Yellow River system. DIAGNOSTIC CHARACTERS.-A single small lateral spine or tubercle is present on each side of the carapace, and the first pleopod of the male is of almost uniform thickness up to the tip. Projecting from the latter are only three small elements: one that is spiniform, a hooklike one, and (in the first form male) a very small corneous tooth that, in lateral aspect, lies between the two. Hooks are present on the ischio- podites of the third and fourth walking legs in the male. COL0R NoTEs,-Ground color reddish brown with a greenish cast. Lateral portion of carapace lighter with more tan, becoming cream to light green along ventral margins of branchiostegites. Dorsolateral p6rtion of branchiostegites with a pair of black spots, one just posterior to the cervical groove and the other just anterior to caudal margin of carapace, both on a level with the eyes. Legs olive green above and greenish cream below. Cheliped dark orange brown with black tuberclei above, orange below with black and cream tubercles. - ECOLOGICAL OBSERVATIONS.-P. pycnogonopodus has an ecological toler~nce as wide as that of any of the crayfishes in the region, and - ALABAMA GEORGIA ALABAMA GEORGIA HENR~ ~ CLAY ../ DALE HENRy t CLAV· (t C UN T DOU 0 BAKER BAKER m .0... ~HOU TON ILLER .0.- ALABAMA. o DECA 9 GRADY ALABA,W~ <1~ ~ ' ~ GRADY ~ MITCHELL ,. ..CHEL. SEMINOLE SEMINOLE FLORIbAFLO I A / . JACKSON, / JACKSON O0 GEORGIA GEORGIA 1959 H O BBS A N D H A R T: FR E S H W ATE R C R U S TA C E A N S 169 LEON 1 FLORIDA WASHINGT FLORIDA WASHINGT /408¤a~ /00 A WAKULLA 1,' CAL. Ii'/ _ WAKULLA BAY 1 LIEATY * A | LIBERTY ~ FAA KLIN GULF FRA ~LIN 0 R opolochicolde 0 0· dlogenes A R pygmalue m o.fodlens m R veroutus 14/ A R youngl 744 GULF OF MEXICO GULF OF MEXICO MAP5 MAPG 170 BULLETIN FLORIDA STATE MUSEUM Vol. 4 is the only one that has been found in brackish water. Wherever epigean water occurs within its range, with the possible exception of the larger rivers, this species is usually present. Even in temporary bodies of water, such as pools, ditches, and some streams, it is usually present; and when the water disappears, it constructs simple burrows as much as 8 feet in depth. The presence or absence of vegetation in the water appears not to restrict it, but it seems to be more abundant in habitats rich in aquatic plants. LIFE HISTORY NOTES.-First form males have been collected in April, May, June, October, and November. Females with eggs have been ob5erved in April, May, and October. CRAYFISH ASSOCIATES.-P. spicolifer, P.„ kilbyi. P. rogersi rogersi, P. latipleurum, P. pygmaeus, P. hubbelli, P. paeninsulanus, P. apa- lachicolae, and.Cambarellus schmitti. Procambarus paeninsulanus (Faxon) (Figure 18; Map 3) Cambarus clarkii paeninsulanus Faxon 1914, Mem. Mus. Comp. Zool., 40 (8): 869. Procambarus clarkii paeninsulanus Hobbs 1942, Amer. Midl. Nat., 28 (2): 342 (by implication). Procambarus paeninsulanus Hobbs 1942, Univ. Fla. Publ., Biol. Sci. Ser., 8 (2): 104, 5 Bgs. Procambarus paeninsulanus is not only relatively abundant in the area, but is common throughout its range, which extends from the Choctawhatchee River system in Florida eastward to the Atlantic Ocean and from southeastern Alabama and southern Georgia south- ward to Hillsborough County, Florida. DIAGNOSTIC CHARACTERS.-The purplish red color of the adults of this species coupled with an almost flat annulus ventralis in the female and a distinct angular prominence on the cephalic surface of the first left pleopod of the male will readily separate this species from others in the area. COLOR NOTES.-Ground color purplish red with purplish to black markings. Lateral surface of carapace lighter in color ventrally, pass- ing from pink to pinkish cream. Branchiostegites with a dark band running longitudinally from almost the caudal margin of the carapace to the cervical groove on a level with the eyes. Chelipeds red or reddish orange with black 9r cream tubercles; lower surface more brillantly colored than upper surface. 1959 HOBBS AND HART: FRESHWATER CRUSTACEANS 171 ECOLOGICAL OBSERVATIONS.-This species, like P. pycnogonopodus and P. leonensiss is not limited to one or two types of ecological situ- ations but is found in almost all aquatic habitats in ·its range. Like the two previous species it constructs 5imple burrows, and almost all the females carrying eggs have been collected from the straight or gently sloping tunnels. Although there is no evidence that these animals undergo mass migrations overland as do their close relative P. clarkii (see Penn 1948: 15), specimens have been collected at least 42 mile from the nearest. body of water. It was formerly quite a- bundant in several localities now inundated by the impounded waters of the Jim WoodrufE Dam, both aiong the western border of the Chattahoochee in Florida and in the lower Flint in Georgia. LIFE HISTORY NOTES.-First form males have been collected in every month of the year except January and December, and females with eggs in March, May, and August thr6ugh November. Females with young were also collected from August through November. CRAYFISH ASSOCIATES.-P. kilbyi, P. spiculifer, P. pygmaeus, P. pycnogonopodus, P. hubbelli, P. youngi, P. leonensis, Orconectes cly- peatus, Cambarellus schmitti, Cambarus diogenes, and C. fodiens. Procambarus apalachicolae Hobbs . (Figure 20; Map 5) Procambarus apalachicolae Hobbs 1942, Univ. Fla. Publ., Biol. Sci. Ser., 8 (2) 55,15 figs. This species, although abundant in its relatively small range, is apparently confined to the Apalachicola Batwoods in southern Bay and Gulf counties, Florida. Its range in relation to those of P. latipleurum and P. econ/inae (Hobbs 1942:-49) is discussed by Hobbs (idem, pp. 57-58). DIACNOST[C CHARACTERS.-The absence of spines on the rostrum and on the lateral surfaces of the carapace together tith the rela- tively broad areola (approximately three times as long as·wide), hooks on the ischiopodites of the third and fourth pereiopods of the male, prominent tubercles on the cephalolateral borders of the annulus ven- tralis of the female, and a caudodistally directed spine on the first pleopod of the male serve to identify this species, COLOR NOTES.-None ayailable. EcoLOGICAL OBSERVATIONS.-P. apalachicolae is a secondary bur- rower and typically inhabits depressi6ns in the Apalachicola flatwoods where water stands during some period each year. When the de- ALABAMA GEORGIAALABAMA GEORGIA 172 B U LLE T IN F LO R ID A S TATE M U S E U M V ol. 4 C AY DALE| DUE - UN y 00", CAL UN Y0 EARLY BAKEBNCER v/ /U $ 0- ' /15.-~-fL . \=/ / / /LLER 0.--~OU TOM ;,/ ..0.ELL r ix . ° ... 4 -*°' .c. Nat. Hist., N. Y., 10: 92-136, Volpe, E. Peter, and George Henry Penn 1957. Dimot©hism of chr6matophore patterns in the dwarf crawfish. Journ. Hered., 48 (8): 90-96,2 figs; 8 tables. Contributions to the BULLETIN OF THE F.LORIDA STATE MUSEUM may be in any field of biology. Manuscripts dealing with natural history or systematic problems involving the southeastern United States or the Caribbean area are solicited especially. Manuscripts should be of medium length-12 to 200 printed pages. Examination for suitability is made by an Editorial Board. The BULLETIN is distributed worldwide, through institutional subscsiptions and exchanges only. It is considered the responsibility of the author to distribute his paper to all interested individuals. To aid in this, fifty copies are furnished the author without cost. PREPARATION OF MANUSCRIPT ' Highly recommended as a guide is the "Style sheet for the scientific serial publica- tions of the American Museum of Natural History," second edition, revised, 1958. 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