Clubiona didentata Zhang & Yin, 1998

Yu, Hao & Li, Shuqiang, 2019, On further species of the spider genus Clubiona Latreille, 1804 (Araneae, Clubionidae) from Xishuangbanna Rainforest, southwestern China, Zootaxa 4679 (2), pp. 201-230 : 207

Clubiona didentata Zhang & Yin, 1998

Figs 5–6

Clubiona didentata Zhang & Yin, 1998: 11 , figs 6–8

Material examined. CHINA: Yunnan: Xishuangbanna, Mengla County, Menglun Town, Menglun Nature Reserve , leg. G. Tang and Z.Y. Yao: 1♂, G213 roadside, lowevergreen forest (N21º53.794′, E101º17.152′, 594 m), 27 Novem- ber 2009 (Tang-Yao _ No. 29) ; 2♀, G213 roadside, Bamboo plantation (N21º53.640′, E101º16.940′, 580 m), 3 De- cember 2009 (Tang-Yao _ No. 40) ; leg. H. Yu and Z.G. Chen: 1♂, 3♀, XTBG, Rubber-Tea Plantation (N21º55.239′, E101º15.854′, 572 m), 28 July 2018 ( Yu _20180728_Searching-26) .

Diagnosis. Males of this species resembles those of C. kai Jäger & Dankittipakul, 2010 ( Jäger & Dankittipakul 2010: 25, figs 4–6; Figs 7 A–E) in having a tegular apophysis, usually absent in other species of the corticalis group, but differ by: (1) the basal branch of embolus bulky and hidden in ventral view ( Fig. 5D ) (relatively thinner and clearly visible in C. kai ; Fig. 7D ); (2) embolus slightly curved ( Figs 5 C–D) (embolus twisted in C. kai ; Figs 7 C–D); (3) conductor large and heavily sclerotized ( Figs 5 D–E) (conductor small and partly membranous in C. kai ; Figs 7 D–E); (4) tegular apophysis large and triangular, pointing distally ( Fig. 5D ) (tegular apophysis small and teethshaped, pointing prolatero-distally; Fig. 7D ). Females also resemble those of C. kai in having an atrial membrane and similar vulvae ( Figs 6 A–C; Figs 8 A–C), but can be recognized by the atrial membrane nearly tongue-shaped ( Figs 6 A–B) (disc-shaped in C. kai ; Figs 8 A–B), bursae surface wrinkled ( Fig. 6C ) (bursae surface smooth in C. kai ; Fig. 8C ).

Description. Male: Total length 3.48; prosoma 1.42 long, 0.95 wide; opisthosoma 1.89 long, 0.93 wide. Prosoma ( Figs 6 D–E), ovoid in dorsal view, pars cephalica slightly narrowed, widest between coxae II and III; in profile highest just behind longitudinal fovea, gradually sloping towards pars cephalica; integument smooth, clothed with short fine hairs. Carapace yellowish, without distinct color pattern; fovea dark. Chelicerae light orange, 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 straight in dorsal view. AME dark, other eyes light; with black rings. Eye sizes and interdistances: AME 0.06, ALE 0.09, PME 0.10, PLE 0.11, AME–AME 0.02, AME–ALE 0.03, PME–PME 0.15, PME–PLE 0.07, MOQL 0.13, MOQA 0.10, MOQP 0.25. Legs light yellow, without distinct color markings. Leg formula: IV, II, III, I; leg measurements: I 2.76 (0.60, 1.29, 0.51, 0.42), II 3.72 (1.25, 1.30, 0.82, 0.44), III 3.25 (0.98, 1.13, 0.73, 0.35), IV 4.68 (1.34, 1.50, 1.38, 0.46). Opisthosoma ( Figs 6 D–E) oval, dorsally yellowish-white with a lengthwise light orange heart mark, reaching posterior half; muscular depression inconspicuous; with conspicuous anterior hair tuft; venter white. Spinnerets light yellow. Palp ( Figs 5 A–E): tibia short, only with retrolateral apophysis; RTA wide and thumb-shaped, with blunt tip; bulb oval and distinct expanded, sperm duct indistinct; embolus dagger-like, with a bulky base and a sharp tip; conductor large and heavily sclerotized, linguiform; tegular apophysis large, shape like a equilateral triangle, it’s apex sharp and pointing distally.

Female: Total length 3.72; prosoma 1.18 long, 0.92 wide; opisthosoma 2.04 long, 1.10 wide. General color lighter than in male ( Figs 6 F–G). Eye sizes and interdistances: AME 0.09, ALE 0.10, PME 0.13, PLE 0.11, AME– AME 0.05, AME–ALE 0.06, PME–PME 0.21, PME–PLE 0.05, MOQL 0.14, MOQA 0.13, MOQP 0.27. Legs yellowish-white, without distinct color markings. Leg formula: IV, II, I, III; leg measurements: I 3.26 (0.94, 1.35, 0.61, 0.34), II 3.59 (1.05, 1.41, 0.73, 0.40), III 3.11 (0.89, 0.93, 0.80, 0.35), IV 4.41 (1.21, 1.52, 1.22, 0.45). Epigyne ( Figs 6 A–C): Epigynal plate slightly wider than long, margin not rebordered; atrium small, with tongue-shaped membrane on anterior margin; spermathecae and bursae prominently visible through epigynal plate in ventral view; copulatory openings small, located at basolateral atrial borders; spermathecae situated anteriorly, with bean-shaped proximal part and acicular distal part; fertilization ducts short and curved; reniform bursae situated posteriorly, translucent, surface wrinkled.

Distribution. Presently known only from Xishuangbanna.

Figures

FIGURE 5. Clubiona didentata Zhang & Yin, 1998, male: 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: C, conductor; E, embolus; RTA, retrolateral tibial apophysis; TA, tegular apophysis. Scale bars: 0.10 mm (A–B, C–E in the same scale).

FIGURE 6. Clubiona didentata Zhang & Yin, 1998, male (D–E) and female (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: AM, atrial membrane; BS, bursa; 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).

FIGURE 7. Clubiona kai Jäger & Dankittipakul, 2010, male: 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: C, conductor; E, embolus; EB, embolic base; RTA, retrolateral tibial apophysis; TA, tegular apophysis. Scale bars: 0.10 mm (A–B, C–E in the same scale).

FIGURE 8. Clubiona kai Jäger & Dankittipakul, 2010, male (D–E) and female (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:AM, atrial membrane; BS, bursa; 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).