Clubiona quadrata, 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 : 161-164

Clubiona quadrata sp. nov.

Figs 7–8

Type material. Holotype: ♂ (IZCAS Ar 34568), 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: CHINA: Yunnan: Xishuangbanna, Mengla County, Menglun Town , Menglun Nature Reserve , 1 6 , 1♀ ( IZCAS Ar 34569–34570), same data as holotype ; 1 6, 2♀ ( IZCAS Ar 34571–34573), G213 roadside, Bamboo plantation (N21°54.386', E101°16.803', 627 m), 22 November 2009, leg. G. Tang and Z. Y. Yao (Tang-Yao _ No. 18) ; 1♀ ( IZCAS Ar 34574), G213 roadside, Bamboo plantation (N21°54.380', E101°16.815', 620 m), 21 November 2009, leg. G. Tang and Z. Y. Yao (Tang- Yao _ No. 16) ; 1♀ ( IZCAS Ar 34575), Bamboo plantations near G213 roadside (N21°54.380', E101°16.815', 620 m), 21 November 2009, leg. G. Tang and Z.Y. Yao (Tang-Yao _ No. 17); 3 6 ( IZCAS Ar 34576–34578), G213 roadside, Bamboo plantation (N21°54.380', E101°16.815', 627 m), 22 November 2009, leg. G. Tang and Z.Y. Yao (Tang- Yao _ No. 19); 1 6 ( IZCAS Ar 34579), G213 roadside, Bamboo plantation (N21°53.646', E101°16.975', 589 m), 26 November 2009, leg. G. Tang and Z. Y. Yao (Tang-Yao _ No. 26) ; 2 ♀ ( IZCAS Ar 34580–34581), Bamboo plantation (N21°53.622', E101°16.955', 581 m), 26 November 2009, leg. G. Tang and Z.Y. Yao (Tang-Yao _ No. 27); 1 6 ( IZCAS Ar 34582), Valley tropical seasonal rainforest (N21°56.206', E101°16.204', 560 m), 1 December 2009, leg. G. Tang and Z.Y. Yao (Tang-Yao _ No. 37) .

Etymology. The species epithet is taken from the Latin adjective “ quadratus ” and refers to the subquadrate tegular hump.

Diagnosis. Males of Clubiona quadrata sp. nov. can be easily distinguished from those of other members of the C. hystrix group by the distinctly long embolus and the subquadrate tegular hump ( Figs 7 A–E). The females appear to be closely related to those of C. papuana Chrysanthus, 1967 ( Chrysanthus 1967: 413, figs 21, 28–29) in having similarly convoluted copulatory ducts, but differs by: (1) epigynal plate with two diagonal ridges ( Figs 8 A– B) (ridge absent in C. papuana ); (2) the course of the copulatory ducts longer and more complex. ( Figs 8 C–D).

Description. Male (holotype): Total length 2.61; prosoma 1.29 long, 0.84 wide; opisthosoma 1.26 long, 0.71 wide. Prosoma ( Figs 8 E–F), oval, pars cephalica slightly narrowed, widest between coxae II and III, in profile slightly higher just behind ocular region, gradually sloping posteriorly; integument smooth, clothed with short fine hairs. Carapace light orange, without distinct color pattern; longitudinal fovea reddish. Chelicerae coloured as carapace, both margins with four teeth. Labium and endites yellowish-orange, longer than wide. Sternum yellowish. Eyes: both anterior and posterior eye rows recurved in dorsal view; AME dark, other eyes light; with black rings. Eye sizes and interdistances: AME 0.06, ALE 0.06, PME 0.07, PLE 0.06, AME–AME 0.04, AME– ALE 0.02, PME–PME 0.12, PME–PLE 0.05, MOQL 0.16, MOQA 0.15, MOQP 0.24. Legs yellowish, without distinct color marking. Leg formula: IV, II, I, III; leg measurements: I 5.02 (1.53, 0.73, 1.53, 0.75, 0.49), II 5.59 (1.65, 0.76, 1.63, 0.99, 0.54), III 4.75 (1.57, 0.53, 1.07, 1.06, 0.52), IV 7.54 (2.26, 0.52, 3.32, 1.59, 0.85). Opisthosoma ( Figs 8 E–F) elongate-oval, dorsally with a pairs of muscular depressions; with conspicuous anterior hair tufts; venter and spinnerets light yellow. Palp ( Figs 7 A–E): tibia short, only with retrolateral apophysis, RTA small, with a triangular base and a hair-like tip; genital bulb elongated, with relatively flat tegulum, sperm duct distinctive, U-shaped; tegulum distinctly longer than wide, apex with a subquadrate tegular hump, base with a blunt flange; embolus distinctly long, slender, basal portion wide, originating from retrolateral side of tegulum, apex filiform, terminating at approximately five o’clock position relative to tegulum.

Female (paratype IZCAS Ar 34571): Total length 3.63; prosoma 1.60 long, 1.43 wide; opisthosoma 1.18 long, 1.96 wide. Not strikingly different from males but darker in color ( Figs 8 G–H). Eye sizes and interdistances: AME 0.08, ALE 0.07, PME 0.09, PLE 0.07, AME–AME 0.07, AME–ALE 0.03, PME–PME 0.20, PME–PLE 0.05, MOQL 0.21, MOQA 0.18, MOQP 0.34. Legs yellowish, without distinct color marking. Leg formula: IV, I, II, III; leg measurements: I 2.86 (0.76, 0.56, 0.77, 0.53, 0.24), II 0.58 (0.66, 0.42, 0.77, 0.51, 0.21), III 2.12 (0.53, 0.34, 0.49, 0.43, 0.34), IV 4.01 (1.14, 0.45, 0.91, 0.91, 0.60). Epigyne ( Figs 8 A–D): Epigynal plate longer than wide, through which spermathecae and copulatory ducts well visible, posterior margin not rebordered; atrium absent; two copulatory openings small, contiguous, situated at medial portion of epigynal plate posterior margin, hidden in two diagonal ridges in ventral view; copulatory ducts strongly entwined, ascending dorsally and descending ventrally two times, respectively, forming two longitudinal loops and then connected to lateral spermathecae; both spermathecae and bursae globular, the former anteriad and smaller than the latter; bursae translucent with smooth surface; fertilization ducts acicular, membranous, located on dorsal-lateral surface of spermathecae.

Distribution. Presently known only from the type locality.

Figures

FIGURE 7. Clubiona quadrata 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; RTA, retrolateral tibial apophysis; TH, tegular hump. Scale bars: 0.10 mm (A–B, C–E in the same scale).

FIGURE 8. Clubiona quadrata sp. nov., male holotype (E–F) and female paratype (A–D, G–H): A–B, epigyne, ventral view (A uncleared; B cleared); C–D, vulva, dorsal view (C cleared; D cleared and embedded in Arabic gum); E–H, habitus (E, G dorsal view; F lateral view; H ventral view). Abbreviatures: BS, bursa; CD, copulatory duct; CO, copulatory opening; FD, fertilization duct; R, epigynal ridge; SP, spermatheca. Scale bars: 0.10 mm (A–D in the same scale); 1 mm (E–F, G–H in the same scale).