Clubiona subyaginumai, Yu & Li, 2019

Yu, Hao & Li, Shuqiang, 2019, Eight new species of the genus Clubiona Latreille, 1804 from Xishuangbanna Rainforest, southwestern China (Araneae, Clubionidae), Zootaxa 4545 (2), pp. 151-178 : 158-161

Clubiona subyaginumai sp. nov.

Figs 5–6

Type material. Holotype: 6 (IZCAS Ar 34548), CHINA: Yunnan: Xishuangbanna, Mengla County, Menglun Town , Menglun Nature Reserve , Garbage dump, Secondary tropical forest (N21°54.380´, E101°16.815´, 627 m), 23 November 2009, leg. G. Tang and Z.Y. Yao (Tang-Yao_No.21). Paratypes: 9♂, 10♀ ( IZCAS Ar 34549–34567), same data as holotype .

Etymology. The specific name is a Latin substantive referring to its similarity to Clubiona yaginumai Hayashi, 1989 , being a combination of the preposition sub (near) and the epithet of that species.

Diagnosis. Clubiona subyaginumai sp. nov. resembles C. yaginumai by the similar habitus: slender body and pale colour ( Chikuni 1989: 126, fig. 20; Figs 6 D–G), but is consistently separable by its genitalia. Males of C. subyaginumai sp. nov. appear to be closely related to those of C. yaginumai ( Hayashi 1989: 103, figs 1–6) in having similarly bulged bulb and spiculate embolus, but differ by: (1) palpal tibia with prolateral apophysis ( Fig. 5A ); (2) the shorter retrolateral tibial apophysis ( Fig. 5B ); (3) embolic base represented by enlarged tubercle ( Figs 5 C–E) (embolic base absent in C. yaginumai ); Females resemble those of C. ryukyuensis Ono, 1989 ( Ono 1989: 159, figs 14–15) for the general shape of vulva, but can be recognized by the atrium smaller and sclerotized ( Figs 6 A–B) (larger and soft in C. ryukyuensis ); spermathecae subtriangular ( Figs 6 B–C) (egg-shaped in C. ryukyuensis ).

Description. Male (holotype): Total length 3.92; prosoma 1.55 long, 1.03 wide; opisthosoma 2.29 long, 0.74 wide. Prosoma ( Figs 6 D–E), elongate-oval, ocular region distinctly narrowed, widest between coxae II and III; in profile highest just behind longitudinal fovea; integument smooth, clothed with short fine hairs. Carapace yellowish, without distinct color pattern; fovea dark. Chelicerae coloured as carapace, with five promarginal and three retromarginal teeth. Labium and endites light orange, longer than wide. Sternum yellowish white. Eyes: AER slightly recurved, PER wider than AER and slightly procurved in dorsal view. AME dark, other eyes light; with black rings. Eye sizes and interdistances: AME 0.06, ALE 0.07, PME 0.07, PLE 0.06, AME–AME 0.04, AME– ALE 0.08, PME–PME 0.15, PME–PLE 0.15, MOQL 0.22, MOQA 0.17, MOQP 0.32. Legs white, without distinct color markings. Leg formula: IV, II, I, III; leg measurements: I 3.60 (0.96, 0.43, 1.12, 0.75, 0.35), II 4.29 (1.28, 0.44, 1.32, 0.86, 0.39), III 3.34 (1.01, 0.25, 0.86, 0.83, 0.40), IV 4.80 (1.32, 0.41, 1.33, 1.32, 0.42). Opisthosoma ( Figs 6 D–E) cylindrical, white, without distinct marking. Palp ( Figs 5 A–E): tibia short, with two apophyses, PTA broad and blunt, with partly membranous tip; RTA short, flat and thumb-like; bulb oval and strongly bulged, base and basolateral portion marked with numerous brown spots, sperm duct inconspicuous; embolus needle-like, distinctly short, originating at distal portion of tegulum, gradually tapering toward apex; embolic base represented by enlarged tubercle; conductor absent.

Female (paratype IZCAS Ar 34549): Total length 4.07; prosoma 1.23 long, 0.92 wide; opisthosoma 2.76 long, 1.13 wide. General color lighter than in male ( Figs 6 F–G). Eye sizes and interdistances: AME 0.04, ALE 0.07, PME 0.06, PLE 0.05, AME–AME 0.05, AME–ALE 0.07, PME–PME 0.15, PME–PLE 0.20, MOQL 0.20, MOQA 0.15, MOQP 0.29. Legs white, without distinct color markings. Leg formula: IV, II, I, III; leg measurements: I 2.92 (0.81, 0.37, 0.82, 0.60, 0.32), II 3.54 (1.06, 0.39, 1.05, 0.69, 0.36), III 2.86 (0.89, 0.32, 0.67, 0.65, 0.34), IV 3.92 (1.06, 0.38, 1.07, 1.03, 0.38). Epigyne ( Figs 6 A–C): Epigynal plate shorter than wide, margin not rebordered; atrium small, anterior margin horizontal, heavily sclerotized; copulatory ducts and spermathecae clearly visible through the tegument in ventral view; copulatory openings small, located at lateral sides of atrium, leading to copulatory ducts which descend obliquely to connect with spermathecae; spermathecae subtriangular; fertilization ducts short and curved, acicular; reniform bursae situated posteriorly, translucent, surface smooth.

Distribution. Presently known only from the type locality.

Figures

FIGURE 5. Clubiona subyaginumai sp. nov., male holotype: A–B, left palp (A prolateral view; B retrolateral view); C–E, left palpal bulb (C prolateral view; D ventral view; E retrolateral view). Abbreviatures: E, embolus; EB, embolic base; PTA, prolateral tibial apophysis; RTA, retrolateral tibial apophysis. Scale bars: 0.10 mm (A–B, C–E in the same scale).

FIGURE 6. Clubiona subyaginumai sp. nov., male holotype (D–E) and female paratype (A–C, F–G): A–B, epigyne, ventral view (A uncleared; B cleared); C, vulva, cleared, dorsal view; D–G, habitus (D, F dorsal view; E lateral view; G ventral view). Abbreviatures: BS, bursa; CD, copulatory duct; CO, copulatory opening; FD, fertilization duct; SP, spermatheca. Scale bars: 0.10 mm (A–C in the same scale); 1 mm (D–E, F–G in the same scale).