Abdosetae digitata, Jin, Chi, Fu, Jianying & Zhang, Feng, 2015

Jin, Chi, Fu, Jianying & Zhang, Feng, 2015, A review of the genus Abdosetae (Araneae: Phrurolithidae) from China, Zootaxa 4007 (1), pp. 91-103 : 95-96

Abdosetae digitata sp. nov.

Figs 2–3

Type material. Holotype ♂, China, Hainan Province, Ledong County, Mt. Jianfengling, Tianchi Lake (18°44′25″N, 108°51′44″E), 825 m a.s.l., 29 January 2015, leg. Lina Fu ( MHBU). Paratypes: 2♀, same data as holotype ( MHBU); Hainan Province: 1♀, Mt. Wuzhi (18°51′59″N, 109°40′46″E), 662 m a.s.l., 26 January 2015, leg. Chi Jin ( MHBU); 1♂, Baoting County, Mt. Qixianling (18°42′01″N, 109°41′51″E), 340 m a.s.l., 8 June 2009, leg. Guangxin Han ( MHBU).

Etymology. The species name is from a Latin adjective meaning “digitiform”, and refers to the thumb-shaped branch on the inner side of the RTA medially on the male palp.

Diagnosis. This new species can be easily distinguished from A. hainan and A. ornata by having one branch on the inner side of the RTA, and the epigyne with a pair of shallow concavities that conceal the copulatory openings in their anterior margins. It can be distinguished from A. falcata sp. nov. and A. hamata sp. nov. by: 1) a thumbshaped RTA branch, whereas the other two species have a RTA branch that is sickle-shaped and hook-shaped, respectively; 2) a spine-shaped TA that is slightly bent to the retrolateral side, whereas in the latter two species the TA is canine-shaped and bent to the prolateral side, and knife-shaped and longitudinally orientated, respectively; 3) the posterior margins of the epigynal concavities are conspicuously sclerotized, whereas they are unsclerotized in the latter two species; 4) the spermathecae are separated from each other, whereas they are close together in the latter two species.

Description. Male. Total length 1.95–2.56 (n=2). Holotype ( Fig. 2 A): total length 2.56; carapace 1.29 long, 1.12 wide; abdomen 1.27 long, 0.90 wide. Carapace ovoid, yellowish-brown at centre, with black marginal bands, cephalic groove and radial furrow brown. In dorsal view, AER slightly recurved, PER slightly wider than AER and recurved; eye diameters: AME 0.09, ALE 0.10, PME 0.08, PLE 0.11; eye interdistances: AME–AME 0.04, AME– ALE 0.01, PME–PME 0.09, PME–PLE 0.04, ALE–PLE 0.07; MOA 0.19 long, front width 0.18, back width 0.21. Clypeus height 0.12. Chelicerae yellowish-brown, with single spine anteriorly. Leg measurements: I 4.74 (1.22 + 0.41 + 1.33 + 1.17 + 0.61), II 3.95 (1.07 + 0.48 + 1.00 + 0.94 + 0.46), III 3.86 (0.97 + 0.35 + 0.84 + 1.04 + 0.66), IV 5.52 (1.38 + 0.49 + 1.26 + 1.52 + 0.87). Leg spination: see Table 1.

Abdomen ovoid, light grey; posterior half dark with several indistinct black chevrons dorsally; flanks black ( Fig. 2 A).

Palp ( Figs 2 G–I, 3C–E). Femur heavily swollen on ventral side, with distal concavity on retrolateral side. RTA wide basally, wider distally, with one short, thumb-shaped branch medially; one triangular apophysis between branch and apex, with tip bent in prolateral direction; VTH inconspicuous; DTA lamellar, twisted, with thick base and hooked tip; cymbium with RBC that is visible only in dorsal view; tegular apophysis conspicuous, short, spineshaped, slightly bent in the retrolateral direction; embolus slender, with sharp tip, pointed towards 12 o’clock position.

Female. Total length 2.19–3.28 (n=3). Paratype ( Fig. 2 B): total length 3.28; carapace 1.44 long, 1.19 wide; abdomen 1.93 long, 1.16 wide. Clypeus height 0.10. Eye diameters: AME 0.08, ALE 0.09, PME 0.08, PLE 0.11; eye interdistances: AME–AME 0.05, AME–ALE 0.01, PME–PME 0.10, PME–PLE 0.04, ALE–PLE 0.07; MOA 0.20 long, front width 0.16, back width 0.23. Leg measurements: I 4.93 (1.30 + 0.51 + 1.42 + 1.30 + 0.40); II 4.28 (1.03 + 0.47 + 1.09 + 1.08 +0.61); III 4.12 (1.07 + 0.43 + 0.84 + 1.09 + 0.69); IV 5.75 (1.48 + 0.51 + 1.30 + 1.61 + 0.85). Leg formula: 4123. Leg spination: see Table 1.

Abdomen dorsally with a longitudinal black stripe ( Fig. 2 B). Carapace darker than in male; other characters as in male.

Epigyne ( Figs 2 E–F, 3A–B). With a pair of shallow concavities, with inconspicuous anterior margins where copulatory openings are concealed, and conspicuous, sclerotized posterior margins; copulatory ducts connected to two oval, transparent bursae; bursae with oval, sclerotized bases; spermathecae small and spherical, separated by almost half a spermatheca’s diameter; vertical distance between copulatory openings and spermathecae nearly one spermatheca’s diameter; bursae and spermathecae connected by slender tube.

Distribution. Known from three localities in the southern half of Hainan ( Fig. 8).

Figures

FIGURE 2. Abdosetae digitata sp. nov.: A male body, dorsal view; B female body, dorsal view; C male abdomen, ventral view; D female abdomen, ventral view; E epigyne, ventral view; F vulva, dorsal view; G male left palp, prolateral view; H same, ventral view; I same, retrolateral view. Scale bars: 0.5 mm (A – B); 0.2 mm (C – I).

FIGURE 3. Abdosetae digitata sp. nov.: A epigyne, ventral view; B vulva, dorsal view; C male left palp, prolateral view; D same, ventral view; E same, retrolateral view. Scale bars: 0.25 mm (A – E).