Ptocasius longlingensis, Yang & Peng, 2023

Yang, Su-Fang & Peng, Xian-Jin, 2023, A review of the Ptocasius Simon, 1885 spiders of Gaoligong Mountains, China (Araneae: Salticidae), European Journal of Taxonomy 903 (1), pp. 1-61 : 34-38

Ptocasius longlingensis sp. nov.

urn:lsid:zoobank.org:act:95F38EC9-6370-40AC-AB4E-4B3B7D6AEA03

Figs 24–26 , 46

Diagnosis

The male of the new species resembles that of P. urbanii ( Żabka, 1981) ( Żabka 1981: figs 31–34), but can be distinguished by: (1) embolus originating at about 8:00 o’clock position in ventral view ( Figs 24B , 26A ), while originating at about 9:00 o’clock in P. urbanii ( Żabka 1981: fig. 31); (2) tibial apophysis finger-shaped in retrolateral view ( Figs 24C , 26B ), while needle-shaped in P. urbanii ( Żabka 1981: fig. 33). The female of the new species resembles that of P. urbanii ( Żabka 1981: figs 25–26, 41), but can be distinguished by: (1) top of pockets close to posterior margin of copulatory openings in ventral view ( Figs 25B , 26D ), while relatively away from posterior margin of copulatory openings in P. urbanii ( Żabka 1981: fig. 25); (2) spermathecae almost touching, distinctly twisting outward in dorsal view ( Figs 25C , 26E ), while distinctly diverging, twisting inward in P. urbanii ( Żabka 1981: fig. 26); (3) the top margins of spermathecae below and away from copulatory openings in dorsal view ( Figs 25C , 26E ), while parallel and close to copulatory openings in P. urbanii ( Żabka 1981: fig. 26).

Etymology

The specific name is derived from the type locality Longling County.

Type material

Holotype

CHINA • ♂; Yunnan Province, Longling County, Longjiang Township, Xiaoheishan Nature Reserve ( Guchengshan mountain ); 24º49′43″ N, 98º45′33″ E; 2010 m a.s.l.; 26 May 2005; Heng-mei Yan leg.; in the forest; HNU-GKJ026–2A.

Paratypes (3 ♀♀)

CHINA – Yunnan Province • 3 ♀♀; same collection data as for holotype; HNU-GKJ026– 2P.

Description

Male (holotype)

BODY AND HEAD. Total length 4.15. Prosoma 2.01 long, 1.59 wide. Opisthosoma 2.14 long, 1.45 wide. Clypeus high 0.08. Carapace ( Fig. 24A ) dark brown, covered with brown hairs; carapace margin and eyes base black, densely covered with brown hairs; anterior ocular area covered with sparse long brown hairs; lateral area and median area of the thoracic region covered with sparse white hairs. Fovea dark brown and sulciform. Cervical groove indistinct, radial groove dark brown. Eye diameters and interdistances: AME 0.43, ALE 0.24, PME 0.06, PLE 0.22, AERW 0.96, PERW 1.06, EL 0.90. Sternum brown and scutiform, covered with brown hairs, the median area slightly bulged; marginal areas dark brown, covered with long brown hairs. Clypeus dark brown, sparsely covered with long brown hairs. Endites and labium dark brown, sparsely covered with long dark brown hairs; distal area yellowish brown, densely covered with grayish hairs.

CHELICERAE ( Fig. 26C ). Reddish brown, densely covered with long dark brown hairs, two promarginal teeth and one retromarginal denticle.

LEGS. Legs I and II are dark brown, with grayish annuli, densely covered with long gray hairs; others are yellowish-brown, bearing numerous short spines. Tibiae I and II with three pairs of long ventral spines, metatarsi I and II with two pairs of ventral spines.

LEG MEASUREMENTS. I = 3.76 (1.17, 1.39, 0.63, 0.57), II = 3.41 (1.14, 1.19, 0.57, 0.51), III = 3.79 (1.19, 1.20, 0.90, 0.50), IV = 3.94 (1.30, 1.23, 0.90, 0.51). Leg formula: IV–III–I–II.

ABDOMEN ( Fig. 24A ). Long oval, dorsum yellowish brown, densely covered with short brown hairs and sparse long brown hairs; each side with a black longitudinal band and black arc grains; the posterior inner sides with a triangular reddish-brown patch, the median area with dense white hairs and two pairs of sigillae; ventral yellow, densely covered with white hairs; the median area with a dark brown longitudinal band; sides with dark brown patches. Spinnerets dark brown, densely covered with long brown hairs.

PALP ( Figs 24B–C , 26A–B ). Longer than wide; embolus slender, originates at about 8:00 o’clock position; genital bulb about rectangular, with membranous structure; genital lobe large and triangular; tibial apophysis finger-shaped in retrolateral view, about ⅓ the length of the genital bulb.

Female (paratypes)

BODY AND HEAD. Total length 4.86. Prosoma 2.24 long, 1.71 wide. Opisthosoma 2.56 long, 1.70 wide. Clypeus high 0.10. Carapace ( Fig. 25A ) reddish brown, densely covered with brown hairs; carapace margin and eyes base black; lateral area and anterior covered with sparse long brown hairs. Fovea sulciform, reddish brown. Cervical groove indistinct, radial groove reddish brown. Eye diameters and interdistances: AME 0.51, ALE 0.27, PLE 0.27, AERW 1.24, PERW 1.09, EL 1.02. Sternum scutiform, yellowish brown, covered with brown hairs; the median area slightly bulged; marginal area dark brown, covered with long brown hairs. Clypeus brown, the anterior area covered with sparse long brown hairs. Endites and labium brown, sparsely covered with long dark hairs; distal area yellowish brown, covered with dense grayish hairs.

CHELICERAE ( Fig. 26F ). Brown, distal area covered with long dark brown hairs, two promarginal teeth and one retromarginal denticle.

LEGS. Reddish brown, with black annuli or spots, densely covered with long brown hairs, bearing numerous short spines. Tibiae I and II with three pairs of long ventral spines, metatarsi I and II with two pairs of ventral spines.

LEG MEASUREMENTS. I = 3.43 (1.13, 1.33, 0.49, 0.48), II = 3.17 (1.07, 1.19, 0.43, 0.48), III = 3.97 (1.30, 1.36, 0.67, 0.64), IV = 4.27 (1.35, 1.45, 0.82, 0.65). Leg formula: IV–III–I–II.

ABDOMEN ( Fig. 25A ). Oval, dorsum light yellow, densely covered with white hairs; distal area sparsely covered with long brown hairs; each side with a black longitudinal band, densely covered with brown hairs and twills black; the posterior inner area with three pairs of herring bones; the posterior portion with a black round spot and two pairs of sigillae, small and dark brown; ventral light yellow, densely covered with white hairs, scattered with irregular grayish spots and streaks. Spinnerets dark brown, densely covered with long brown hairs.

EPIGYNUM ( Figs 25B–C , 26D–E ). Almost as long as wide; top of pockets close to posterior margin of copulatory openings in ventral view; copulatory openings longitudinal; spermathecae almost touching, distinctly twisting outward, the top margins below and away from copulatory openings in dorsal view.

Distribution

China (Yunnan Province, Fig. 46 ).

Figures

Fig. 24. Ptocasius longlingensis sp. nov., holotype, ♂ (HNU-GKJ026–2A). A. Body, dorsal view. B. Palp, ventral view. C. Palp, retrolateral view. Scale bars: A = 0.5 mm; B–C = 0.1 mm.

Fig. 25. Ptocasius longlingensis sp. nov., paratype, ♀ (HNU-GKJ026–2P). A. Body, dorsal view. B. Epigynum, ventral view. C. Vulva, dorsal view. Scale bars: A = 0.5 mm; B–C = 0.1 mm.

Fig. 26. Ptocasius longlingensis sp. nov. A–C. Holotype, ♂ (HNU-GKJ026–2A). D–F. Paratype, ♀ (HNU-GKJ026–2P). A. Palp, ventral view. B. Palp, retrolateral view. C. Chelicerae, posterior view. D. Epigynum, ventral view. E. Vulva, dorsal view. F. Chelicerae, posterior view. Scale bars = 0.1 mm.

Fig. 46.Distribution records of the species: P. longlingensissp. nov. (▲), P. montanus (Żabka, 1981) (•) and P. rectangulus sp. nov. (▇).