Otacilia curvata, Jin, Chi, Fu, Lina, Yin, Xiangchu & Zhang, Feng, 2016

Jin, Chi, Fu, Lina, Yin, Xiangchu & Zhang, Feng, 2016, Four new species of the genus Otacilia Thorell, 1897 from Hunan Province, China (Araneae, Phrurolithidae), ZooKeys 620, pp. 33-55 : 41-42

Taxon classification Animalia Araneae Phrurolithidae

Otacilia curvata sp. n. Figs 7, 8, 9

Type material.

Holotype ♂, China, Hunan Province: Shuangpai County, Mt. Yangming, around the Forest Park Service (26°03'36.698"N, 111°56'12.707"E), 539 m a.s.l., 24 September 2015, Chi Jin leg. Paratypes: 5♀3♂, same data as for holotype; 2♀4♂, Shuangpai County, Mt. Yangming, Wanshou Temple (26°06'27.490"N, 111°55'19.186"E), 1375 m a.s.l., 26 September 2015, Chi Jin leg.; 2♀1♂, Shuangpai County, Mt. Yangming, Hongjun Pavilion (26°04'34.924"N, 111°56'19.223"E), 1324 m a.s.l., 27 September 2015, Xiangbo Guo and Jingchao He leg.

Etymology.

The specific name is derived from the Latin “curvatus”, meaning curved and refers to the shape of the DTA of the male palp; adjective.

Diagnosis.

The male can be distinguished from all other longituba group species, except Otacilia bifurcata Dankittipakul & Singtripop, 2014, Otacilia loriot Jäger & Wunderlich, 2012 and Otacilia namkhan Jäger & Wunderlich, 2012, by having a long RTA and a long DTA and can be distinguished from them by the needle-like embolus (embolus of these three species claw-like, knife-shaped and semicircular respectively) (Figs 8 A–D, 9 A–C). The female of the new species can be easily distinguished from all of the other longituba group species, except Otacilia microstoma Wang et al., 2015, by the copulatory ducts longitudinal and close together, and it can be distinguished from Otacilia microstoma by the present of glandular appendages and sigmoid connecting tubes (glandular appendages absent and connecting tubes V-shaped in Otacilia microstoma ) (Figs 8 E–G, 9 D–E; Wang et al. 2015: figs 1 D–E, 2 F–G).

Description.

Male (Fig. 7 A–B). Total length 2.51-2.80 (n = 5). Holotype: body 2.67 long; carapace 1.37 long, 1.15 wide; abdomen 1.30 long, 0.96 wide. Carapace yellowish brown, with black marginal bands; middle with broad longitudinal black stripe, from ocular area to the posterior margin of carapace; fovea longitudinal, dark brown. Diameter of eyes: AME 0.08, ALE 0.09, PME 0.06, PLE 0.10. Eye interdistances: AME–AME 0.03, AME–ALE 0.01, PME–PME 0.08, PME–PLE 0.06, ALE–PLE 0.05. MOA 0.19 long, front 0.19 wide, back 0.20 wide. Clypeus 0.12 high. Chelicerae with two strong anterior bristles; promargin with three well-separated teeth and retromargin with five denticles close to each other. Labium and sternum dark yellow. Legs light yellowish brown; all femora with distal black annulus; patellae I–II all black, patellae III–IV absenting black patches; tibia I almost all black, tibiae II–IV with black proximal and distal annulus; metatarsus I distal half part black, metatarsi II–IV with black distal annulus. Measurements of legs: leg I 4.95 (1.31, 0.51, 1.42, 1.21, 0.50), II 3.90 (1.06, 0.40, 1.02, 0.91, 0.51), III 3.36 (0.86, 0.44, 0.68, 0.86, 0.52), IV 4.90 (1.29, 0.45, 1.09, 1.41, 0.66). Leg formula: 1423. Femora I–III lack dorsal spines, femur IV with one dorsal spine, femur I with three prolateral spines; tibia I with six proventral spines and seven retroventral spines, tibia II with six proventral spines and five retroventral spines; metatarsus I with four pairs of ventral spines, metatarsus II with four proventral spines and three retroventral spines. Abdomen oval, dorsum black, anterior half with a narrow dorsal scutum, posterior half with several chevron-like black stripes; venter light grey.

Palp (Figs 8 A–D, 9 A–C). Femur distally with an inflated hump on ventral side. RTA thick in proximal part and abruptly tapering at half of its length. DTA with anterior and posterior margins parallel in proximal part from the dorsal view, then abruptly curved to the prolateral side of bulb, tapering and with an enlarged blunt apex. Embolus short, needle-like. Conductor membranous, close to and as long as the embolus. Tegular apophysis absent but with a tegular ridge.

Female (Fig. 7 C–D). Total length 2.77-2.85 (n = 7). One paratype: body 2.77 long; carapace 1.41 long, 1.20 wide; abdomen 1.36 long, 1.01 wide. Eye diameters: AME 0.08, ALE 0.09, PME 0.07, PLE 0.10. Eye interdistances: AME–AME 0.04, AME -ALE 0.01, PME–PME 0.07, PME–PLE 0.07, ALE–PLE 0.07. MOA 0.21 long, front 0.18 wide, back 0.19 wide. Clypeus 0.11 high. Leg measurements: I 5.11 (1.31, 0.54, 1.46, 1.29, 0.51); II 4.10 (1.10, 0.49, 1.03, 0.97, 0.51); III 3.46 (0.91, 0.43, 0.73, 0.86, 0.53); IV 5.08 (1.35, 0.50, 1.12, 1.41, 0.70). Leg formula: 1423. Femur II with one dorsal spines and two prolateral spines, tarsus II with six proventral spines and five retroventral spines, other segments with the same spination as male. Abdomen light grey, anterior half lacks dorsal scutum. Other characters as in male.

Epigyne (Figs 8 E–F, 9D): median plate absent; copulatory openings situated centrally, tiny. and trumpet-shaped. Vulva (Figs 8G, 9 E–F): copulatory ducts longitudinal, connecting with a pair of large, transparent, long, ovoid bursae; spermathecae located posteriorly, small and ovoid, close to each other; bursae and spermathecae connected by strong, curved, sigmoid connecting tubes. Glandular appendages present, as long as the diameter of one spermatheca.

Distribution.

Known only from the type localities, Hunan, China (Fig. 13).