595 Contributions to the Knowledge of the Myrmecophilous Pselaphines (Coleoptera, Staphylinidae, Pselaphinae) from China. IX. a Redefinition of the Genus Anaclasiger, with a Description of a Second Species Associated with Prenolepis sphingthoraxa (Hymenoptera, Formicidae) by Zi-Wei Yin1, Bao-Ping Huang2 & Li-Zhen Li1,3 ABSTRACT The genus Anaclasiger Raffray is redefined and its taxonomic placement briefly discussed, based on the discovery of a second species of the genus, A. zhudaiae sp. n., collected in association with the ant Prenolepis sphingthoraxa from South China. The new species is described and illustrated. An identifica- tion key to species of Anaclasiger is provided. INTRODUCTION The monotypic genus Anaclasiger Raffray was established (Raffray, 1890a) for a unique species, A. sinuaticollis Raffray, from Singapore. Subsequently, the species was recorded from Taiwan (Raffray, 1914) and Malaysia (Nomura & Idris, 2005). Recently, A. sinuaticollis was redescribed (Nomura et al., 2006) in detail with SEM illustrations, and was reported from Thailand and Japan in the same paper. In 2010, the junior author, Bao-Ping Huang, conducted several investiga- tions on the local entomological fauna of Shenzhen city, during which a small series of clavigerine beetles were collected from several colonies of the ant Prenolepis sphingthoraxa Zhou et Zheng. Among the collected specimens, some proved to represent an undescribed genus and species, recently named (Yin et al. 2011) Sinoclavigerodes yalianae, and a single individual belonged to an unknown species of the genus Anaclasiger. 1Lab of Environmental Entomolog y, Department of Biolog y, College of Life and Environmental Sciences, Shanghai Normal University, 100 Guilin Road, Shanghai, 200234, P. R. China. E-mail: yin_ziwei@yahoo.com 2 Room 301, 88 Bu-Wei Village, Jingtian Rd., Futian District, Shenzhen, 518034, Guangdong Province, P. R. China. 3Corresponding author. E-mail: pselaphinae@gmail.com 596 Sociobiolog y Vol. 59, No. 3, 2012 The purpose of this paper is to redefine the genus Anaclasiger and briefly discuss its taxonomic placement, to describe the new species with illustra- tions of its major diagnostic features, and to provide an identification key to species of the genus Anaclasiger. MATERIAL AND METHODS A slash (/) is used to separate lines on the same label, a double slash (//) is used to separate different labels. The foveal terminolog y follows Chandler (2001), except for using ‘ventrite’ instead of ‘sternite’. The following acronyms are used in the text: AL–length of the abdomen; AW–maximum width of the abdomen, measured in dorsal view; BL–length of the body (= HL + PL + EL + AL); EL–length of the elytra, measured along the sutural line; EW–maximum width of the elytra; HL–length of the head, measured from the anterior clypeal margin to the occipital constric- tion; HW–width of the head across eyes; PL–length of the pronotum along midline; PW–maximum width of the pronotum. The holotype is deposited in the Insect Collections of Shanghai Normal University. TAXONOMY Genus Anaclasiger Raffray Anaclasiger Raffray, 1890a: 165 Type species Anaclasiger sinuaticollis Raffray (subseq. mon. by Raffray, 1890b: 216). Diagnosis Head cylindrical, frontal rostrum strongly projecting ; antennae formed by four antennomeres, antennomeres I–II short, and antennomeres III–IV long ; antennomeres IV rounded apically, lacking setose truncate cavity. Pronotum lacking foveae; with distinct lateral antebasal constriction. Elytra lacking basal foveae; discal striae present; lacking setal trichome at postero- lateral margins. 597Zi-Wei Yin et al.— The Myrmecophilous Genus Anaclasiger Redescription Length 1.5–2.1 mm. Head with prominent frontal rostrum, lacking antennal tubercles; nude vertexal foveae widely separated; antennae with four anten- nomeres, antennomeres I–II short and subequal in length, III–IV elongate; antennomeres III straight, IV much longer than III, curved laterally, with dense apical setae; gula broadly and shallowly swollen, with two gular foveae moderately separated. Pronotum with thick discal setae in anterior half; mediobasal impression large and shallow; distinct lateral antebasal constriction covered with rows of long setae; lacking lateral antebasal foveae; lacking lateral procoxal foveae. Elytra lacking basal fovea; discal striae extending from humeral angle and extending to at least elytral midpoint. Meso- and metathorax lacking foveae; metathorax strongly convex medi- ally; with broad posterior margin. Legs short to elongate; tarsomeres I–II very short, III elongate; tarsomeres I often difficult to see. Abdomen with tergites IV–VI fused into composite plate, with deep transverse basal impression, deep basolateral foveae in impression; thick setal trichome at lateral ends of impression; paratergites IV–VI well demarcated, IV with linear tufts of setae at base; sternites IV–V subequal in length, VI– VII short; sternite IV with large mediobasal foveae. Aedeagus asymmetric, median lobe broad and enlongate; with sclerotized endophallus; large dorsal diaphragm opening oval. Comparative notes. This is placed as a unique genus in the subtribe Clavigerodina by the head being separated from the neck by an occipital carina, the elytra covered with short, thin and sparse setae arranged without order, and the composite tergite lacking a laterally well-defined furrow in the large transverse basal depression. Anaclasiger shares only with Microdiartiger Sawada the short antennomeres I–II and long antennomeres III–IV. This genus also shares with Sinoclavigerodes Yin et al. the lack of the setal trichome at the elytral posterolateral margins. Anaclasiger can be readily separated from all Asian clavigerodine genera by the terminal antennomere being rounded apically (not truncate) and lacking an apical setose cavity, and the pronotum with a distinct lateral antebasal constriction. 598 Sociobiolog y Vol. 59, No. 3, 2012 Fig. 1. Dorsal habitus of Anaclasiger sinuaticollis. Scale: 0.3 mm. 599Zi-Wei Yin et al.— The Myrmecophilous Genus Anaclasiger Dorsal habitus of Anaclasiger zhudaiae, holotype. Scale: 0.5 mm. 600 Sociobiolog y Vol. 59, No. 3, 2012 Anaclasiger zhudaiae Yin and Huang, new species (Figs. 2-9) Type material. Holotype female, labeled ‘CHINA: Guangdong Prov. / Shenzhen, Yantian Dist. / Yantian Station / 30.i.2010, B.P. Huang leg. // [red] HOLOTYPE / Anaclasiger zhudaiae sp. n. / Yin et Huang det 2012, SNUC'. Description. Female. Body (Fig. 2) length 2.06 mm; reddish brown, mouthparts and tarsi lighter. Head (Fig. 3) longer than wide, HL 0.37 mm, HW 0.27 mm; with sparse short setae dorsally; eyes each composed of about Figs. 3-8. Details of Anaclasiger zhudaiae. 3. head and pronotum; 4. right antenna; 5. right elytron and tergal base; 6. tergite VIII; 7. sternite VIII; 8. female genitalia. Scales: a–c = 0.3 mm; d–f = 0.1 mm. 601Zi-Wei Yin et al.— The Myrmecophilous Genus Anaclasiger 25 facets; length of antennomeres III 0.22 mm, IV 0.61 mm, III / IV = 1: 2.8 (Fig. 4); antennomeres IV rounded apically, with dense long apical sensory setae. Pronotum (Fig. 3) slightly longer than wide, PL 0.42 mm, PW 0.32 mm; lacking punctation; lateral antebasal constriction formed by distinct marginal sulci; small mediobasal pit in large impression. Elytra (Fig. 5) wider than long, EL 0.55 mm, EW 0.76 mm; sparsely with short setae dorsally, with row of long thick setae at posterolateral margins; discal striae extending from humeral angle to 2/3 of elytral length. Composite plate strongly convex dorsally, with long discal setae and short setae around disc. Tergite VIII (Fig. 6) transverse, roundly narrowed posteriorly, with thick setae. Sternite VIII (Fig. 7) transverse, flat at posterior margin. Female genitalia complex (Fig. 8) well sclerotized. Male. Unknown. Host ant Prenolepis sphingthoraxa Zhou and Zheng, 1998 (det. by the junior author). This is the first host record for Anaclasiger. Biology. The single specimen was collected from the ant colony nesting under a rock near a stream (Fig. 9). Distribution Guangdong Province, South China. Remarks The new species can be readily separated from A. sinuaticollis by the much longer antennae and legs, antennomeres IV slightly curving laterally at the apical half, elytra with sparse long and thick setae at the anterolateral margins, and the elytral discal striae extending past the elytral midpoint. Anaclasiger sinuaticollis has relatively short antennae and legs, antennomeres IV are abruptly twisted laterally in the apical half, the elytra lack long thick setae at the anterolateral margins, and the discal striae end at the elytral midpoint. The habitat of the new species is shown in Fig 9. Etymology The specific name is dedicated to the junior author’s grandmother, Zhu- Dai Zhang, to celebrate her coming 85th birthday. 602 Sociobiolog y Vol. 59, No. 3, 2012 KEY TO SPECIES OF ANACLASIGER RAFFRAY 1.Antennomeres III–IV relatively shorter, IV abruptly curved laterally at middle (Nomura, 2006: 288, Fig. 2-F). Pronotum barely wider than long (Nomura et al., 2006: 288, Fig. 2-G). Elytra lack row of long thick setae at anterolateral margins (Nomura, 2006: 289, Fig. 3-E). (Singapore, Thailand, Malaysia, China: Taiwan, Japan) ............................. A. sinuaticollis Raffray - Antennomeres III–IV much longer, IV evenly curved laterally through entire length (Fig. 4). Pronotum slightly longer than wide (Fig. 3). Elytra with rows of long thick setae at posterolateral margins (Fig. 5). (China: Guangdong ) ..................................A. zhudaiae Yin & Huang, new species ACKNOWLEDGMENTS We thank Shûhei Nomura (Tokyo, Japan) for providing specimens of Ana- clasiger sinuaticollis for the comparative study. Donald S. Chandler (Durham, U.S.A) critically read the manuscript and corrected the English. The present study is supported by the National Natural Science Foundation of China (No. 31172134), and by Shanghai Normal University (No. SK01242). Fig . 9. Habitat of Anaclasiger zhudaiae. 603Zi-Wei Yin et al.— The Myrmecophilous Genus Anaclasiger REFERENCES Chandler D.S. 2001. Biolog y, morpholog y, and systematics of the ant-like litter beetles of Australia (Coleoptera: Staphylinidae: Pselaphinae). Memoirs on Entomolog y International 15: 1–560. Nomura S. & Idris A.G. 2005. Faunistic notes on the pselaphine species of the supertribes Giniaceritae, Pselaphitae and Clavigeritae from Malaysia and Singapore (Coleoptera: Staphylindae: Pselaphinae). Serangga 10(1-2): 1–36. 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(2011) Contributions to the Knowledge of the Myrme- cophilous Pselaphines (Coleoptera, Staphylinidae, Pselaphinae) from China. V. Sinoclavigerodes yalianae gen. et sp. nov. (Clavigeritae) Associated with Anoplolepis gracilipes (Formicidae). Sociobiolog y 57(1): 1–9. The host ant of Sinoclavigerodes yalianae was figured, but erroneously iden- tified as Anoplolepis gracilipes. The correct specific name should be Prenolepis sphingthoraxa Zhou & Zheng.