Microsoft Word - 02. 04-09 ZNT-2.doc Bangladesh J. Plant Taxon. 16(1): 9-19, 2009 (June) © 2009 Bangladesh Association of Plant Taxonomists A TAXONOMIC ACCOUNT ON THE PHYTOPLANKTON OF A POND RECEIVING TEXTILE INDUSTRIAL EFFLUENTS. II. EUGLENOPHYCEAE AND BACILLARIOPHYCEAE Z.N. TAHMIDA BEGUM1 Department of Botany, University of Dhaka, Dhaka 1000, Bangladesh. Keywords: Industrial effluents; Phytoplankton; Taxonomy; Euglenophyceae; Bacillariophyceae. Abstract A total of 97 phytoplanktonic algal taxa belonging to 17 genera under two classes (Euglenophyceae and Bacillariophyceae) have been recorded from a pond receiving effluents from two textile industries at Demra, Dhaka district. Five diatom species, namely Navicula cryptocephala Kütz., N. decussis Oestrup, N. rhynchocephala Kütz., N. viridula Kütz. and Nitzschia intermedia Hantzsch are new records for Bangladesh. Introduction For the assessment of water quality phytoplankton are important biological indicators and sometimes they are better than physical and chemical variables (Round, 1985). Previously, information about the physico-chemical aspects (Begum and Hossain, 1993), and impact of major and minor elements on the plankton community (Begum et al., 1996) of a pond receiving textile industrial effluents have been made for the first time from Bangladesh. Recently, Begum (2008) has described the phytoplanktonic algal taxa belonging to six classes, namely Cyanophyceae, Chlorophyceae, Xanthophyceae, Chrysophyceae, Cryptophyceae and Dinophyceae from the same pond at Demra, Dhaka district. The present paper is a continuation and last part of the previous one, based on the same collections, and it includes 97 taxa under Euglenophyceae and Bacillariophyceae. Materials and Methods The samples were collected from a pond receiving textile industrial effluents in different seasons of 1990 and 1991. Description of sample collections, their preservation and examination, details of physical and chemical conditions of water at four stations or sampling points have been published by Begum (2008). Literature consulted for the identification of all the phytoplankton are: Islam and Khatun (1966), Islam and Haroon (1975), Islam and Aziz (1977, 1979), Islam and Chowdhury (1979), Islam and Hossain (1979), Germain (1981), Islam and Moniruzzaman (1981), Aziz and Islam (1986), Islam and Mannan (1986), Khondker et al. (1990), Islam et al. (1991), Aziz and Ara (2000), Nahar (2001), Aziz and Tanbir (2003), Islam and Alfasane (2004), and Islam and Irfanullah (2005). In the present study classification proposed by Bold and Wynne (1985) is followed. 1 E-mail: botany@univdhaka.edu 10 BEGUM Taxonomic enumeration A total of 97 taxa belonging to 17 genera under two classes are presented in this paper, most of them have been reported previously from different aquatic bodies, mostly polluted water (see references in the Materials and Methods). However, five diatom taxa are newly recorded for Bangladesh as indicated after their brief descriptions. Class: Euglenophyceae Order: Euglenales; Family: Euglenaceae 1. Euglena acus (Müller) Ehr., Abhandl. königl. Akad. der Wiss. zu Berlin 1: 1-88, pl. 6 (1830). [Syn.: Vibrio acus Müller (1786), Euglena acus var. rigida Hübner (1886), E. acus var. minor Hansgirg (1892)]. Cells 76-250 µm long, 5.7-14.3 µm broad. Stations: 1-4; abundant. 2. Euglena australica var. claviformis Playfair, Proc. Linn. Soc. N. S. W. 48: 223 (1923). Cells 20 µm long, 14 µm broad. Stations: 1-3; common. 3. Euglena chlamydophora Mainx, Arch. f. Protistenk. 60: 342, pl. 1, fig. 8 (1928). Cells 54 µm long, 17 µm broad. Stations: 1-4; common. 4. Euglena clavata Skuja, Symb. Bot. Upsal. 9(3): 189, pl. 22, figs 2-5 (1948). Cells 99 µm long, 16 µm broad. Stations: 2, 4; rare. 5. Euglena deses Ehr., Abhandl. d. Akad. d. Wiss. Berlin 1833: 248 (1834). [Syn.: Enchelys deses Müller (1786), Euglena satelles Braslavska-Spectorova (1937)]. Cells 99 µm long, 11 µm broad. Station: 2; rare. 6. Euglena exilis Gojdics, The Genus Euglena: 148, pl. 28, fig. 4 (1953). Cells 48 µm long, 11.4 µm broad. Stations: 1-3; few. 7. Euglena flava Dangeard, Le Botaniste 8: 180, pl. 5, figs. 53 (1902). Cells 16-44 µm long, 6.4-14.3 µm broad. Station: 3; rare. 8. Euglena geniculata Dujardin, Infusiones: 362 (1841). Cells 99 µm long, 15.6 µm broad. Stations: 1-4; common. 9. Euglena granulata (Klebs) Fr. Schmitz Jahrb. Wiss. Bot. 15: 16 (1884). [Syn.: E. velata var. granulata Klebs (1883)]. Cells 37-64 µm long, 23-29 µm broad. Stations: 1, 2, 4; few. 10. Euglena güntheri Gojdics, Univ. Wisconsin Press, Madison, p.161, fig.1, pl. 33 (1953). [Syn.: Enchelys terricola Günther (1928)]. Cells 54-97 µm long, 11.4-14.5 µm broad. Stations: 1, 2, 4; common. 11. Euglena pisciformis Klebs, Unters. bot. Inst. Tüb. 1(2): 302 (1883). [Syn.: E. agilis H. J. Carter (1856)]. Cells 24-82 µm long, 7-11 µm broad. Stations: 1-4; abundant. A TAXONOMIC ACCOUNT ON THE PHYTOPLANKTON OF A POND 11 12. Euglena polymorpha Dangeard, Le Botaniste 8: 175 (1902). [Syn.: E. granulata var. polymorpha Popova (1966)]. Cells 73 µm long, 6.6-23.8 µm broad. Stations: 1, 2; common. 13. Euglena proxima Dangeard, Le Botaniste 8: 154 (1902). Cells 54 µm long, 14.2 µm broad. Station: 3; rare. 14. Euglena sanguinea Ehr., Physik. Abh. kgl. Akad. Wiss. 1: 1-18, pl. 6. 1830 (1831). [Syn.: Cercaria viridis Müller (1790), Euglena viridis var. sanguinea Playfair (1921)]. Cells 60-102 µm long, 31 µm broad. Stations: 1-4; abundant. 15. Euglena sociabilis (Schimtz) Dangeard, La Botaniste 8: 182 (1902). Cells 70 µm long, 7 µm broad. Stations: 1-4; abundant. 16. Euglena spirogyra Ehr., Abh. K. Akad. Wiss. Berlin, Phys. Kl. 1830: 83, pl. 6: 6 (1830). [Syn.: E. spirogyra var. fusiformis Deflandre (1924)]. Cells 70-74 µm long, 3-14 µm broad. Stations: 1-4; common. 17. Euglena subehrenbergii Skuja, Symb. Bot. Upsal. 9(3): 192 (1948). Cells 92 µm long, 11.5 µm broad. Station: 1; rare. 18. Euglena tripteris (Dujardin) Klebs, Unters. Bot. Inst. Tüb. 1: 306 (1883). [Syn.: E. torta Stokes (1885), E. tripteris subsp. crassa Swirenko (1915)]. Cells 65-97 µm long, 11-17 µm broad. Station: 2; very rare. 19. Euglena variabilis Klebs, Unters. Bot. Inst. Tüb. 1: 300 (1883). Cells 77 µm long, 14-29 µm broad. Stations: 1, 2; abundant. 20. Phacus caudatus Hübn., Euglenac.-F1. Stralsund: 5, fig. 5 (1886). Cells 18-30 µm long, 8.5-18.2 µm broad. Stations: 1-3; rare. 21. Phacus curvicauda Swirenko, Arch. f. Hydrobiol. v. Planktonk. 10: 333 pl. II, figs 13, 16 (1915). [Syn.: Phacus brevicauda (Klebs) Lemm. bei Fritsch (1918), P. brevicauda fa. minor Defl. (1928)]. Cells 30-80 µm long, 24-47 µm broad. Stations: 1-4; abundant. 22. Phacus longicauda (Ehr.) Duj., Infusoires: 337 (1841). Cells 40 µm long, 33 µm broad. Stations: 1, 2, 4; few. 23. Phacus swirenkoi Skvortzov, Ber. d. Dtsch. Bot. Ges. 46 (105-125) (1928). Cells 38-70 µm long, 23-60 µm broad. Stations: 1, 3, 4; few. 24. Trachelomonas abrupta fa. angustata Defl., Monogr. Du genre Trachelomonas - Nemurous (1926). Lorica 25-26 µm long, 14-18 µm broad. Stations: 1, 2; few. 25. Trachelomonas allorgei var. madaripurense Islam, Int. rev. der Gesamt. Hydrobiol. 66(1): 109-125 (1981). Lorica 71 µm long, 18 µm broad. Station: 1; rare. 26. Trachelomonas armata (Ehr.) Stein, Org. Infusionsthiere III(1): pl. 22, figs 37, 38 (1878). Lorica 12-14 µm long, 21-30 µm broad. Station: 1; rare. 12 BEGUM 27. Trachelomonas armata var. steinii Lemm., Abh. Naturw. ver. Bremen 18: 165 (1905). Lorica 43-50 µm long, 31-39 µm broad. Stations: 2, 3; rare. 28. Trachelomonas caffra Rino, Revista de Ciências Biológicas [Universidade de Lourenco Marques], Série A, 5: 158, pl. 8, figs 6-9 (1972). Lorica with spines 32-33 µm long, 36 µm broad; without spines 22-24 µm long, 22-23 µm broad. Station: 2; rare. 29. Trachelomonas dybowskii Drez., Odbitka z Rosprawi Widom. z Muz. im Dzieduszychich. 7/8 (1921). [Syn.: T. oblonga Lemm. bei Conrad und Van Meel (1952)]. Lorica 16-19 µm long, 9-17 µm broad. Station: 3; rare. 30. Trachelomonas hispida (Perty) Stein, Org. Infusionsthiere III(1): 22, figs 20-34 (1878). Lorica 21-36 µm long, 15-25 µm broad. Stations: 1-4; common. 31. Trachelomonas hispida var. coronata Lemm., Eugl. in Die Süssw. Deutsch. Öst. und der Schweiz, G. Fischer, Jena 2: 150 (1913). Lorica 38 µm long, 22-25 µm broad. Stations: 2-4; few. 32. Trachelomonas hispida var. punctata Lemm., Abh. Naturw. ver. Bremen 18: 165 (1905). Lorica 25-29 µm long, 17-26 µm broad. Stations: 1-4; common. 33. Trachelomonas intermedia Dang., La Botaniste: 8 (97-360) (1901). Lorica 20-25 µm long, 18-21 µm broad. Station: 1; rare. 34. Trachelomonas mucosa var. brevicollis Skv., Ber. d. Dtsch. Bot. Ges. 43: 306-341 (1925). Lorica 18 µm long, 14.5 µm broad. Station: 1; rare. 35. Trachelomonas oblonga Lemm., Abh. Naturw. ver. Bremen 16: 344 (1899). Lorica 11-16 µm long, 7.5-12.4 µm broad. Stations: 1-4; common. 36. Trachelomonas oblonga var. attenuata Playfair, Proc. Linn. Soc: N. S. W., Sydney 40: 1-41 (1915). [Syn.: T. minuscula Drez. (1925)]. Lorica 16.4 µm long, 12.3 µm broad. Station: 2; rare. 37. Trachelomonas oblonga var. truncata Lemm., Beih. Bot. Zbl. 76: 150-156 (1898). Lorica 10-11 µm long, 7.5 µm broad. Station: 2; rare. 38. Trachelomonas oblonga Lemm. fa. ovata Defl., Monogr. Du genre Trachelomonas –Nemurous (1926). Lorica 17.7 µm long, 13.6 µm broad. Station: 1; rare. 39. Trachelomonas planctonica Swir., Arch. Hydrobiol. Planktonk. 9: 633 (1914). Lorica 26-29 µm long, 21 µm broad. Station: 2; rare. 40. Trachelomonas playfairii Defl., Bull. Soc. Bot. France 71: 1125 (1924). [Syn.: T. flexicollis Drez. (1925), non T. flexicollis Drez. (1922)]. Lorica 23-25 µm long, 16-18 µm broad. Stations: 1-4; few. 41. Trachelomonas pulcherrima Playfair, Proc. Linn. Soc.: N. S. W., Sydney 40: 13 (1915). [Syn.: T. oblonga var. pulcherrima (Playfair) Popova (1955)]. Lorica 20.0- 21.5 µm long, 10.0-11.5 µm broad. Station: 2; rare. A TAXONOMIC ACCOUNT ON THE PHYTOPLANKTON OF A POND 13 42. Trachelomonas pulcherrima var. latior Playfair, Proc. Linn. Soc.: N. S. W., Sydney 40: 1-41 (1915). Lorica 20 µm long, 11 µm broad. Station: 2; vary rare. 43. Trachelomonas pulcherrima var. ovalis Playfair, Proc. Linn. Soc.: N. S. W., Sydney 40: 14 (1915). [Syn.: T. oblonga var. ovalis Popova (1955)]. Lorica 19.6 µm long, 10.0-11.4 µm broad. Station: 2; rare. 44. Trachelomonas pusilla Playfair, Proc. Linn. Soc.: N. S. W., Sydney 40: 12 (1915). Lorica 12.4-14.3 µm long, 10.7-12.4 broad. Stations: 1-3; common. 45. Trachelomonas robusta Swir. emend Defl., Arch. Hydrobiol. 9: 636 (1914). Lorica 28.0-28.6 µm long, 21.5-22.0 µm broad. Station: 2; rare. 46. Trachelomonas rotunda Swir., Arch. Hydrobiol. 9: 636 (1914). [Syn.: T. gibbelaris var. rotunda Skv. (1925)]. Lorica 12.0-22.5 µm long, 14-25 µm broad. Stations: 1-4; abundant. 47. Trachelomonas superba Swir., Arch. Hydrobiol. 9: 642 (1914). [Syn.: T. horrida var. superba (Swirenk.) Skv. (1917)]. Lorica 31-41 µm long, 25-35 µm broad. Stations: 2, 4; few. 48. Trachelomonas volvocina Ehr., Phys. Abh. Berl. Akad. Wiss: 145-336 (1833). Lorica 7.0-21.5 µm in diameter. Stations: 1-4; abundant. 49. Trachelomonas volzii Lemm., Arch. Hydrobiol. 1: 409-427 (1906). Lorica 31-32 µm long, 16.5-18.0 µm broad. Stations: 1, 2, 4; few. 50. Trachelomonas volzii Lemm. var. acidophila Bourr., Bull. Inst. Franç. Afr. Noire, ser. A, 23: 310, 354, pl. 5, fig. 13, pl. 6, fig. 2. (1961). Lorica 36-37 µm long, 14-16 µm broad. Station: 1; rare. Class: Bacillariophyceae Order: Centrales; Family: Melosiraceae 51. Melosira granulata (Ehr.) Ralfs, Pritchard, Hist. Inf. ed. 4: 820 (1861). [Syn.: M. moniliformis Ag. (1824)]. Frustules 11.5-15.5 µm long, 8.0 µm broad; half-cells 3.6 µm long. Stations: 1-4; abundant. 52. Melosira varians C. Ag., Flora 10(40): 628 (1827). [Syn.: Lysigonium varians (C. Agardh) De Tone (1892)]. Frustules 20-22 µm long, 9.5 µm broad, spine 7.3 µm long. Stations: 1-3; few. Family: Coscinodiscaceae 53. Coscinodiscus lacustris Grun., K. Svenska Vet.-Akad. Handl., ser. 4, 17(2): 114 (1880). Frustules 33-34 µm in diameter in valve view. Stations: 1-3; few. 14 BEGUM Order: Pennales; Family: Fragilariaceae 54. Fragilaria capucina Desm., Pl. Crypt. France ed. 1, 10: 453 (1825). [Syn.: F. capucina var. lanceolata Grunow (1881)]. Frustules 44 µm long, 4.5 µm broad. Stations: 2-4; common. 55. Fragilaria virescens Ralfs, Ann. Mag. Nat. Hist. 12: 110 (1843). Frustules 42-79 µm long, 5-8 µm broad, striae 9-12 in 10 µm. Stations: 1-4; common. 56. Synedra acus Kütz., Kieselschal. Bacill: 68, pl. 15, fig. 7 (1844). Frustules 149 µm long, 73 µm broad (at the middle), 3.6 µm broad (at the tip), striae 14-16 in 10 µm. Stations: 1-4; abundant. 57. Synedra tabulata (Ag.) Kütz., Bacillarien p. 68 (1844). [Syn.: Diatoma tabulatum Ag. (1832)]. Frustules 33-94 µm long, 4.0-5.5 µm broad, striae 12 in 10 µm. Stations: 1-4; abundant. 58. Synedra ulna (Nitzch) Ehr., Abh. K. Akad. Wiss. Berlin 1831, Phys. Kl. 87 (1932). [Syn: Bacillaria ulna Nitzsch.]. Frustules 320-350 µm long, 6.6 µm broad in the median region; tip 9.5 µm broad. Stations: 1-4; abundant. 59. Synedra ulna var. oxyrhynchus (Kütz.) Ơ Meara, Proc. Ray. Trish Acad., ser. 2 (science): 306 (1875). Frustules 120-126 µm long, 14 µm broad, 10 or 11 striae in 10 µm. Stations: 1-4; common. Family: Eunotiaceae 60. Eunotia alpina (Näg.) Hust., A. Schmidt's Atlas: pl. 291, figs 7, 8 (1913). [Syn.: Synedra alpina Nägeli (1849)]. Frustules 57-100 µm long, 2.5-3.5 µm broad in the median region. Stations: 2-4; common. 61. Eunotia lunaris (Ehr.) Grun., Month. Micr. J. 18: 170 (1877). Frustules 112 µm long, 73 µm broad (at the middle), 15 striae in 10 µm. Stations: 1-4; abundant. 62. Eunotia monodon Ehr., Ath. K. Akad. Wiss. Berlin Physik. Kl. 1841: 414 (1843). [Syn.: E. undoso var. monodon Ehr. (1870), E. major (W. Smith) Rabenhorst (1864)]. Frustules 54 µm long, 7-26 µm broad (at the middle), 9-12 striae in 10 µm. Stations: 1, 2, 4; few. 63. Eunotia pectinalis var. minor (Kütz.) Rab., Bot. Jahrb. 45: 117 (1910). Frustules 43.5 µm long, 3.6 µm broad (at the middle), 14 or 15 striae in 10 µm. Stations: 2, 4; very rare. 64. Eunotia sudetica (O. Müller) Forsch, Ber. Biol. Stat. Plön 6: 59 (1898). Frustules 33 µm long, 15 µm broad, 9 or 10 striae in 10 µm. Stations: 2-4; common. A TAXONOMIC ACCOUNT ON THE PHYTOPLANKTON OF A POND 15 Family: Naviculaceae 65. Gyrosigma acuminata (Kütz.) Rab., Süssw.-Diat.: 47 (1853). [Syn.: Frustulia acuminata Kütz. (1832)]. Frustules 139-165 µm long, 23-25 µm broad. Stations: 1-4; abundant. 66. Gyrosigma attenuatum (Kütz.) Rab., Süssw.-Diat.: 47 (1853). [Syn.: Frustulia attenuate Kütz. (1833)]. Frustules 208-250 µm long, 25 µm broad. Stations: 1-4; abundant. 67. Gyrosigma distortum (W. Smith) Cleve var. parkeri (M.B. Harrisson) Cleve, K. Svenska Vet.-Akad. Handl., ser. 4, 26(2): 116 (1894). Frustules 110-120 µm long, 16-17 µm broad. Stations: 1-4, few. 68. Navicula cryptocephala Kütz., Bacillarien: 95 (1844). Frustules 25-35 µm long, 5-7 µm broad, 16 or 17 striae in 10 µm. Stations: 2-4; few. It is a new record for Bangladesh. 69. Navicula cuspidata Kütz., Bacillarien: 94 (1844). [Syn.: Frustulia cuspidata Kütz. (1833), N. fulva Ehr. (1838)]. Frustules 47-166 µm long, 16-32 µm broad, 11-18 striae in 10 µm. Stations: 1-4; common. 70. Navicula decussis Oestrup, DanSek Diat.: 77, pl. II, fig. 50 (1910). Frustules 16-25 µm long, 6-7 µm broad. Stations: 1-4; abundant. It is a new record for Bangladesh. 71. Navicula exigua (Dujardin) Nouv., Man. Obs. Micr. Atlas.: 44 (1842). Frustules 25- 28 µm long, 7.8 µm broad. Stations: 1-4; abundant. 72. Navicula gastrum (Ehr.) Kütz., Bacillarien: 94 (1844). [Syn.: Pinnularia gastrum Ehr. (1843)]. Frustules 26-49 µm long, 7-10 µm broad. Stations: 2-4; few. 73. Navicula menisculus Schum., Schr. K. Phys.-Ökon. Ges. königs berg 8: 56 (1867). [Syn.: Navicula peregrima var. menisculus A. Mayer (1911)]. Frustules 28 µm long, 6-7 µm broad. Stations: 1-4; abundant. 74. Navicula rhynchocephala Kütz., Bacillarien: 145 (1844). Frustules 50-65 µm long, 12-15 µm broad, 10 striae in 10 µm. Stations: 1, 3, 4; few. It is a new record for Bangladesh. 75. Navicula viridula Kütz., Bacillarien: 91 (1844). Frustules 60-80 µm long, 13-15 µm broad, 6-9 striae in 10 µm. Stations: 1-4; few. It is a new record for Bangladesh. 76. Pinnularia acrosphaeria Bréb. var. laevis Cleve, K. Svenska Vet.-Akad. Handl., ser. 4, 27(3): 86 (1895). Frustules 83 µm long, 12.7 µm broad, 12-14 striae in 10 µm. Stations: 1-4; abundant. 77. Pinnularia gibba var. mesogongyla (Ehr.) Hust., Pascher, Sussw.-fl. 10, 2. Aufl.: 327 (1930). [Syn.: P. mesogongyla Ehr. (1843)]. Frustules 44 µm long, 10 µm broad, 14 or 15 striae in 10 µm. Stations: 2, 3; few. 16 BEGUM 78. Pinnularia gibba var. parva (Ehr.) Grun., An. Mus. Argent. Cienc. Nat. 37: 395 (1933). [Syn.: Navicula stauroptera var. parva Grunow (1860)]. Frustules 33-42 µm long, 8.3-9.0 µm broad, 9-12 striae in 10 µm. Stations: 2-4; few. 79. Pinnularia tabellaria Ehr., Abh. K. Akad.. Wiss. Berlin, Physik. K1. 1841: 422 (1843). Frustules 102 µm long, 16 µm broad (at the middle) and 11 µm broad (at the tip), 15 striae in 10 µm. Stations: 3, 4; few. 80. Pleurosigma balticum var. simile (Ehr.) Grun., Ann. Mag Nat. Hist. ser. 2, 9: 8 (1852). Frustules 87 µm long, 15 µm broad, 19 or 20 striae in 10 µm. Stations: 1, 3; common. 81. Stauroneis anceps fa. gracilis (Ehr.) [Hustedt] Pascher, Süssw.-Fl. 10, 2, Aufl.: 256 (1930). Frustules 90-100 µm long, 9-21 µm broad, 20 or 25 striae in 10 µm. Stations: 2-4; common. Family: Cymbellaceae 82. Cymbella affinis Kütz., Bacillarien: 80 (1844). [Syn.: Cocconema fusidium Ehr. (1838), Cymbella cymbiformis C. Agardh (1830)]. Frustules 83 µm long, 18 µm (at the middle), 11 µm broad (at the tip). 13-15 striae in 10 µm. Station: 4; very rare. 83. Cymbella hustedtii Krasske, Bot. Arch. 3: 204, fig. 11 (1923). Frustules 36 µm long, 11 µm broad (at the middle), 7 µm broad (at the tip), 13-15 striae in 10 µm. Station: 3; rare. 84. Cymbella parva (W. Smith) Kirchner, Alg. Schles.: 188 (1878). [Syn.: Cocconema parvum W. Smith (1853)]. Frustules 80 µm long, 18 µm broad (at the middle), 11 µm broad (at the tip), 10-12 striae in 10 µm. Stations: 1, 3; very rare. 85. Cymbella stuxbergii (Cl.) Cleve, K. Sverska Vet.-Acad. Handl., ser. 4, 26(2): 174 (1894). [Syn.: Cocconema stuxbergii Cleve (1880)]. Frustules 50-69 µm long, 18-22 µm broad, 9-10 striae in 10 µm. Stations: 2-4; common. 86. Cymbella tumida (Bréb. ex Kütz.) Van Heurek, Syn. Diat. Belg. Expl., pl. 2, fig. 10 (1880). [Syn.: Cocconema tumidum Bréb. ex Kütz. (1849)]. Frustules 40-78 µm long, 12-20 µm broad, 10-15 striae in 10 µm. Stations: 2-4; common. 87. Cymbella turgida Gregory, Quart. J. Micr. Sc. 4: 5 (1858). [Syn.: Cymbella eleginenia Krammer (1981)]. Frustules 56 µm long, 15 µm broad, 8 or 9 striae in 10 µm. Station: 3; few. 88. Cymbella turgidula Grun., A. Schmidt, Atlas: pl. a, figs 23-29 (1875). Frustules 38- 39 µm long, 12-14 µm broad, 9 or 10 striae in 10 µm. Stations: 1-4; few. 89. Gomphonema augur Ehr., Ber. K. Akad. Wiss. Berlin 1840: 211 (1840). [Syn.: G. ehrenbergii Farrutherum (1864)]. Frustules 20-22 µm long, 7 µm broad. Stations: 2- 3; few. A TAXONOMIC ACCOUNT ON THE PHYTOPLANKTON OF A POND 17 90. Gomphonema lanceolatum var. turris (Ehr.) Hust., Arch. Hydrobiol. suppl. 14: 166 (1935). [Syn.: G. turris Ehr. (1842)]. Frustules 54-73 µm long, 12-15 µm broad, 9-12 striae in 10 µm. Stations: 1-4; abundant. 91. Gomphonema longiceps var. subclavata (Ehr.) Grun., in Hustedt Pascher, Süssw-Fl. 10. 2. Aufl.: 375 (1930). [Syn.: G. montanum var. subclavatum Grun. (1880)]. Frustules 62 µm long, 11 µm broad. Station: 3; few. 92. Gomphonema olivaceum (Hornemann) Kütz., Bacillarien: 85 (1844). Frustules 45- 48 µm long, 8.5-9.0 µm broad, 8-10 stirae in 10 µm. Stations: 1, 2, 4; few. Family: Epithemiaceae 93. Rhopalodia gibba (Ehr.) Ö Müller, Bot. Jahrb. 22: 65 (1895). [Syn.: Epithemia gibba (Ehr.) Kütz. (1844), Navicula gibba Ehr. (1832)]. Frustules 80-109 µm long, 18.2- 21.8 µm broad (at the middle), 11.0-14.5 µm broad (at the tip) having sometimes median constrictions. Stations: 2-4; common. Family: Bacillariaceae 94. Nitzschia acicularis (Kütz.) W. Smith, Syn. Brit. Diat. I: 43 (1853). [Syn.: Synedra acicularis Kutz. (1844)]. Frustules 35-100 µm long, 3-5 µm broad, striae 16-20 in 10 µm. Stations: 2-4; few. 95. Nitzschia hantzschiana Rabh. in Grunow, Verh. K. Zool.-Bot. Ges. Wien 12: 576 (1862). Frustules 87 µm long, 10 µm broad, 10 canals in 10 µm. Stations: 1-4; common. 96. Nitzschia intermedia Hantzsch, Grunow K. Svenska Vet.-Akad. Handl., Ser. 4, 17(2): 95 (1880). Frustules 40-130 µm long, 4-6 µm broad, 9-12 striae in 10 µm. Stations: 1, 3; few. It is a new record for Bangladesh. 97. Nitzschia longissima (Bréb.) Grunow, Verh. k. Zool.-Bot. Ges. Wien 12: 581 (1862). [Syn.: Ceratoneis longissima Bréb. (1849), Nitzschia birostrata W. Smith (1853)]. Frustules 33 µm long, 4 µm broad. Stations: 2, 4; few. Discussion The studied pond is a unique habitat because of the fact that the limnological parameters showed wide range. Here carbon dioxide was occasionally undetectable at Stations 1 and 3, biocarbonate alkalinity was also undetectable at different times in all the stations and anoxia was observed in all the stations (Begum, 2008). Among the different phytoplankton groups, highest richness was represented by Euglenophyceae (50 taxa), Chlorophyceae (48 taxa) (Begum, 2008), and Bacillariophyceae (47 taxa) followed by Cyanophyceae (17 taxa) (Begum, 2008). Chrysophyceae, Xanthophyceae, Cryptophyceae 18 BEGUM and Dinophyceae were each represented by single species. Similar observation was made earlier by Islam et al. (1991) in organically polluted pond. Dominance of Euglenophyceae in the studied pond is supported by the observations made by Islam et al. (1991) and Begum and Hossain (1993). Record of euglenoid bloom under oxygen deficient condition is in agreement with observations made by previous workers (Hickmen and Penn, 1977; Begum and Hossain, 1993). The comparatively lower representation of Cyanophyceae among the major groups is in agreement with observations made by Islam et al. (1991) and Begum and Hossain (1993). Acknowledgments The author is grateful to late National Professor A.K.M. Nurul Islam, Department of Botany, University of Dhaka, for identification of some euglenoids and diatoms, and also grateful to Md. Zahangir Hossain for the assistance during the collection of the materials. Thanks are due to two textile mill authorities to sample their aquatic habitats. References Aziz, A. and Ara, M. 2000. Diatom taxa from deepwater rice fields at Tangail, Bangladesh. Bangladesh J. Plant Taxon. 7(1): 7-13. Aziz, A. and Islam, A.K.M. Nurul 1986. Lagoon Algae of St. Martin’s Island, Bangladesh. Dhaka Univ. Stud. Part E. 1(1): 45-52. Aziz, A. and Tanbir, M. 2003. Algal flora of some northern districts of Bangladesh. Bangladesh J. Plant Taxon. 10(1): 63-77. Begum, Z.N.T. 2008. 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