Cetonana shaanxiensis, Zhang, Feng, 2017

Zhang, Feng, 2017, Description of Paraceto gen. n. and a relimitation of the genus Cetonana (Araneae: Trachelidae), Zootaxa 4320 (2), pp. 225-244 : 231-233

Cetonana shaanxiensis sp. n.

Figs 4–5

Type material. Holotype: ♀, CHINA: Shaanxi Province: Mei County, Taibai Mountain National Forest Park, Sanhegong (34.038718°N, 107.910842°E), 1457m a.s.l., 2 May 2010, Zongxu Li and Luyu Wang leg ( MHBU) . Paratypes: 1♀, same data as holotype ( MHBU) .

Etymology. The specific name is derived from the type locality; adjective.

Diagnosis. Except the three poorly known Brazilian species, the new species closely resembles the European type species, C. laticeps , in having similar somatic and genitalic characters: AME largest; cusps present on tarsi and metatarsi I–II and tibia I of female; posterior copulatory openings and anterior hood on epigynal plate. However, it can be distinguished from C. laticeps by: 1) cuticular folds and grooves absent on epigynal plate medially, whereas they are present in C. laticeps ; 2) the position of copulatory openings is more anterior than that of the latter species; 3) copulatory ducts not coiled and anteriorly transverse, whereas they are coiled and anteriorly longitudinal in C. laticeps ; 4) ST2 is larger than that of the latter species. Male unknown.

Description. Female. Total length 6.79–7.11 (n = 2). Holotype ( Fig. 4 ): body 7.11 long; carapace 2.70 long, 2.28 wide; abdomen 4.41 long, 2.83 wide. Carapace dark brown, ovoid in dorsal view, truncated at posterior margin, totally flat between fovea and PER ( Fig. 4E ), densely covered with very tiny granulations. Edge of carapace distinct and slightly rebordered. CRW 1.36, 0.60 times of carapace width. Fovea black, distinct.

AER slightly recurved and PER almost straight in dorsal view ( Fig. 4C ). Eye diameters: AME 0.20, ALE 0.15, PME 0.14, PLE 0.15. Eye interdistances: AME–AME 0.07, AME–ALE 0.02, PME–PME 0.22, PME–PLE 0.14, ALE–PLE 0.11. MOA 0.36 long, anterior width 0.43, posterior width 0.48. PERW 0.90, 0.66 times CRW. Clypeus height 0.12, narrower than diameter of AME ( Fig. 4D ). Chilum triangular, sclerotised and brown, visible in front view ( Fig. 4D ).

Chelicerae dark brown, with brown cheliceral boss, with three promarginal and two retromarginal teeth. Endites ( Fig. 4B ) yellow-brown, without oblique depression, apex nearly straight; labium brown, wider than long. Sternum ( Fig. 4B ) brown, shield-shaped, with distinct sharp precoxal triangles and intercoxal sclerites.

Legs brown, without black annulus, anterior legs stouter than posterior legs. Sparse, short scopulae present on tarsi and metatarsi I–II. Leg cusps ( Figs 4F–G ) present on tarsi and metatarsi I–II, ventrally arranged in two lines, cusps on proventral side always more numerous than on retroventral side. Tibia I ( Figs. 4F ) with 2 or 3 cusps proventrally, arranged in single line ( Table 1). Metatarsi III–IV ventrally with distal preening brush. Measurements of legs: leg I 7.48 (2.15, 1.07, 1.78, 1.49, 0.99), II 7.36 (2.14, 1.02, 1.72, 1.53, 0.95), III 6.05 (1.68, 0.85, 1.30, 1.48, 0.74), IV 8.34 (2.24, 1.00, 2.01, 2.20, 0.89). Leg formula: 4123. Abdomen oval, grey, flat, with dense tiny light brown spots; with indistinct white chevrons posteriorly and two pairs of distinct sigilla medially; dorsal scutum absent ( Fig. 4A ). Venter pale grey, with two lines of sclerotized spots ( Fig. 4B ).

Epigyne ( Figs. 5A, C ): poorly sclerotized; anterior hood present, small, pointing to posterior; medially with narrow longitudinal sclerotized stripe, without cuticular folds and grooves medially; copulatory openings small, situated posteriorly. Vulva ( Figs. 5B, D–E ): copulatory ducts short, forming V-shaped bend, ventrally attached to middle region of ST1; connecting ducts originating from ventral side of ST1, folded in V-shape, bypassing ST1 before connected to ST2; ST2 large, elongate oval, situated anteriorly and close to each other; ST1 small, bilobed, connected to small membranous FD.

Distribution. Known only from the type locality ( Fig. 12 ).

Figures

FIGURE 4. Cetonana shaanxiensis sp. n., female, A. habitus, dorsal view; B. same, ventral view; C. ocular area, dorsal view; D. cephalothorax, frontal view; E. habitus, lateral view; F. left tibia, metatarsus and tarsus I, ventral view; G. left tibia, metatarsus and tarsus II, ventral view.

FIGURE 5. Cetonana shaanxiensis sp. n., A. epigyne, ventral view; B. vulva, dorsal view; C. epigyne, ventral view; D. vulva, dorsal view; E. schematic of internal duct system.

FIGURE 12. Distribution of Paraceto gen. n. and Cetonana species of China.