Femorbiona gen. nov., a new genus of sac spiders (Araneae, Clubionidae) from Southeast Asia Author Zhang, Jianshuang School of Life Sciences, Guizhou Normal University, Guiyang, Guizhou, China Author Yu, Hao School of Biological Sciences, Guizhou Education University, Guiyang, Guizhou, China insect1986@126.com Author Li, Shuqiang https://orcid.org/0000-0002-3290-5416 Institute of Zoology, Chinese Academy of Sciences, Beijing, China lisq@ioz.ac.cn text ZooKeys 2021 2021-07-30 1052 25 41 http://dx.doi.org/10.3897/zookeys.1052.66803 journal article http://dx.doi.org/10.3897/zookeys.1052.66803 1313-2970-1052-25 0EF3C375ED5F4C70A134DBE1DA6A5C37 43B22A07D2085C8D994CC6C537BD3902 Femorbiona phami Yu & Li sp. nov. Figs 3 , 4 , 7B Type material. Holotype ♂ (IZCAS Ar 34724), VIETNAM: Hai Phong: Cat Ba National Park: disturbed forest, 20°48.258'N , 107°00.581'E , ca. 80 m, 15.VII.2008, D.S. Pham leg. Paratypes : 1♀ (IZCAS Ar 34725), same locality and collector as holotype, 20°48.249'N , 107°00.016'E , ca. 80 m, 16.VII.2008. Diagnosis. The males of F. phami sp. nov. are most similar to those of F. brachyptera ( Zhu et al. 2012 : 53, figs 2-4, 8-10; Figs 1A-E , 7A ) by the general shape of the palpal femoral apophysis, which is shaped like a short bird wing in retrolateral view (cf. Fig. 1B and Fig. 3B ), but can be distinguished from F. brachyptera by having: (1) the distal tip of the femoral apophysis slightly curved (vs. not curved) (cf. Fig. 7B and Fig. 7A ); (2) in ventral view, the embolar apex relatively long, over 1/3 the length of the embolic base and pointed prolatero-distally (Figs 3D , 7B ) (vs. relatively short tip, <1/6 the length of the embolic base, pointed ventro-distally, as in Figs 1D , 7A ); (3) conductor absent (vs. present) (cf. Figs 3C-E , 7B and Figs 1C-E , 7A ). The female of F. phami sp. nov. can be easily distinguished from all other congeners by the slightly sclerotised and pocket-like copulatory openings and by the absence of an epigynal hood (Fig. 4A, B ) (vs. 2 circular copulatory openings located at the lateral border of hood, as in Figs 2A, B , 6A, B ). Description. Male. Holotype (Fig. 4E, F ): Total length 3.51; carapace 1.66 long, 1.28 wide; opisthosoma 1.85 long, 1.01 wide. Carapace orange, pars cephalica darker in ocular area, without distinct pattern. Eyes: both AER and PER slightly recurved in dorsal view. AME dark, other eyes light; with black rings. Eye sizes and interdistances: AME 0.07, ALE 0.13, PME 0.10, PLE 0.12, AME-AME 0.08, AME-ALE 0.06, PME-PME 0.20, PME-PLE 0.12, MOQL 0.22, MOQA 0.21, MOQP 0.38. Chelicerae slightly darker than ocular area, with 6 promarginal and 5 retromarginal teeth. Labium and endites coloured as chelicerae, longer than wide. Sternum yellowish white. Legs coloured as sternum, without distinct markings. Leg measurements: I 3.56 (0.99, 1.48, 0.70, 0.39), II 4.11 (1.18, 1.69, 0.80, 0.44), III 3.27 (0.95, 1.17, 0.82, 0.33), IV 4.74 (1.32, 1.62, 1.36, 0.44). Abdomen elongate-oval, dorsally yellowish white, dorsum with 2 pairs of inconspicuous muscle depressions; venter white with no distinct pattern. Palp (Figs 3A-E , 7B ): Femur with short retrolateral apophysis originating proximally; FA ca. 1/3-1/4 length of femur, thin distally, wide basally. Patella 2 x longer and 1.3-1.5 x wider than tibia, with round, short prolateral apophysis. Tibia cup shaped, relatively short, <1/3 of cymbium length, with papilliform, partly membranous, ventro-retrolateral apophysis. Tegulum elongate, oval, and inflated, ca. 1.6 x longer than wide; sperm duct indistinct in ventral view. Embolus somewhat helical, more or less Ƨ-shaped in ventral view, base an enlarged tubercle, inserted at approximately the 10-11 o'clock position on tegulum, gradually tapered toward tip; embolar apex needle-like, prolaterally pointed, over 1/3 of base length. Figure 3. Femorbiona phami sp. nov., holotype male palp A prolateral view B retrolateral view C bulb, prolateral view D bulb, ventral view E bulb, retrolateral view. Abbreviations: E = embolus; EB = embolic base; FA = femoral apophysis; PPA = prolateral patellar apophysis; VTA = ventral tibial apophysis. Scale bars: 0.1 mm. Female. Paratype (Fig. 4G, H ): total length 3.99; carapace 1.84 long, 1.43 wide; opisthosoma 2.15 long, 1.07 wide. Eye sizes and interdistances: AME 0.09, ALE 0.13, PME 0.12, PLE 0.10, AME-AME 0.06, AME-ALE 0.06, PME-PME 0.12, PME-PLE 0.15, MOQL 0.27, MOQA 0.27, MOQP 0.48. Legs yellowish white, without distinct markings. Leg measurements: I 4.10 (1.18, 1.70, 0.80, 0.42), II 4.60 (1.33, 1.92, 0.93, 0.42), III 3.72 (1.11, 1.28, 0.93, 0.40), IV 5.31 (1.52, 1.86, 1.47, 0.46). Similar to males but slightly smaller and lighter. Figure 4. Femorbiona phami sp. nov., female paratype and male holotype, epigyne ( A-D ), male habitus ( E, F ) and female habitus ( G, H ) A intact, ventral view B cleared, ventral view C cleared, dorsal view D cleared, dorsal view E dorsal view F lateral view G dorsal view H ventral view. Abbreviations: BS = bursa; CO = copulatory opening; SP = spermatheca. Scale bars: 0.1 mm ( A-D ); 1 mm ( E-H ). Epigyne (Fig. 4A-D ). Epigynal plate wider than long, anterior and lateral margins not rebordered; spermathecae and bursae indistinct, copulatory ducts easily visible through integument in ventral view. Copulatory openings large, pocket-like, located on chitinous structures at the postero-lateral portion of epigynal plate, separated by ca. 1 diameter. Copulatory ducts thick, covered by large spermathecae in dorsal view, directed anteriorly, then connected to spermathecae. Spermathecae long, tubular, sinuous. Bursae oblong, translucent, surface smooth, close together, ca. 2 x longer than wide. Distribution. Known only from the type locality, Hai Phong, Vietnam. Etymology. The specific name is a patronym after Dinh Sac Pham (Hanoi, Vietnam), collector of the type series; noun (name) in apposition.