Abdosetae falcata, 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 : 97-100

Abdosetae falcata sp. nov.

Figs 4–5

Type material. Holotype ♂, China, Hainan Province, Lingshui County, Mt. Diaoluo (18°43′27″N, 109°52′7″E), 926 m a.s.l., 28 January 2015, leg. Chi Jin ( MHBU). Paratypes: 15♀, same data as holotype, leg. Chi Jin and Lina Fu ( MHBU).

Etymology. The species name is from the Latin adjective “falcatus” and refers to the sickle-shaped branch basally on the inner side of the RTA of 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 has a pair of shallow concavities that conceal the copulatory openings in their interior margins. It can be distinguished from A. digitata sp. nov. and A. hamata sp. nov. by: 1) a sickleshaped RTA branch, whereas the latter two species have thumb-shaped and hook-shaped branches, respectively; 2) a canine-shaped TA that is bent in the prolateral direction, whereas the TA in the other two species are spine-shaped and slightly bent in the retrolateral direction, and knife-shaped and longitudinally orientated, respectively; 3) the anterior margins of the epigynal concavities are conspicuously sclerotized, while they are unsclerotized in the other two species; 4) the copulatory openings are trumpet-shaped and relatively large, whereas they are not trumpetshaped and are smaller in the other two species.

Description. Male. Holotype ( Fig. 4 A): total length 2.33; carapace 1.45 long, 0.97 wide; abdomen 1.11 long, 0.73 wide. Carapace elongate-ovoid, yellowish-brown in the centre, with black marginal bands, cephalic groove and radial furrow pale brown. Eye diameters: AME 0.10, ALE 0.09, PME 0.08, PLE 0.09; eye interdistances: AME–AME 0.03, AME–ALE 0.01, PME–PME 0.09, PME–PLE 0.04, ALE–PLE 0.07; MOA 0.17 long, front width 0.16, back width 0.19. Clypeus height 0.09. Measurements of legs: I 4.20 (1.06 + 0.34 + 1.01 + 1.09 + 0.70), II 3.63 (0.94 + 0.37 + 0.90 + 0.86 + 0.56), III 3.15 (0.83 + 0.29 + 0.70 + 0.78 + 0.55), IV 4.30 (1.10 + 0.43 + 1.17 + 1.06 + 0.54). Leg measurements: see Table 1.

Abdomen ovoid, pale grey; dorsal scutum grey suffused with black; posterior half dark with several black chevrons dorsally; flanks black ( Fig. 4 A).

Palp ( Figs 4 G–I, 5D–E). Femur swollen on the ventral side and with distal concavity on the retrolateral side. RTA thick basally, narrow gradually, with beaked tip; in the ventral view, the RTA has one long, slender, sickleshaped branch, bent in the prolateral direction, one small, sharp apophysis basally and one triangular apophysis apically on the inner side. VTH inconspicuous. DTA lamellar, with thick base and hooked tip. Cymbium with an RBC that is visible from the retrolateral and the dorsal views. Tegular apophysis short, canine-shaped, bent slightly in the prolateral direction. Embolus sword-shaped, with sharp tip, pointed towards 11 o’clock position.

Female. Total length 2.25–3.35 (n=15). Paratype ( Fig. 4 B): total length 3.35; carapace 1.43 long, 1.16 wide; abdomen 1.84 long, 1.17 wide. Clypeus height 0.11. Eye diameters: AME 0.09, ALE 0.09, PME 0.08, PLE 0.11; eye interdistances: AME–AME 0.04, AME–ALE 0.02, PME–PME 0.11 PME–PLE 0.05, ALE–PLE 0.10; MOA 0.18 long, front width 0.16, back width 0.22. Leg measurements: I 5.29 (1.36 + 0.59 + 1.42 + 1.34 + 0.58); II 4.45 (1.17 + 0.49 + 1.11 + 1.03 +0.65); III 4.18 (1.12 + 0.40 + 0.86 + 1.09 + 0.71); IV 6.03 (1.54 + 0.53 + 1.37 + 1.71 + 0.88). Leg formula: 4123. Leg spination: see Table 1.

Abdomen dorsally with longitudinal black stripe ( Fig. 4 B). Carapace darker than in male; other characters as in male.

Epigyne ( Figs 4 E–F, 5A–B). With pair of shallow concavities that conceal trumpet-shaped copulatory openings, with conspicuously sclerotized anterior margins, lacking conspicuous posterior margins; copulatory ducts connected to two kidney-shaped transparent bursae, bursae with oval, sclerotized bases; spermathecae small and spherical, close together, longitudinal distance between copulatory openings and spermathecae is approximately one spermatheca diameter; bursae and spermathecae connected by slender tube.

Distribution. Known only from the type locality ( Fig. 8).

Figures

FIGURE 4. Abdosetae falcata 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 – D); 0.2 mm (E – I).

FIGURE 5. Abdosetae falcata 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).