Ptocasius tengchongensis, 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 : 43-47

Ptocasius tengchongensis sp. nov.

urn:lsid:zoobank.org:act:BCCDBA23-A7BE-42DB-97D6-68C4F5C8C0DF

Figs 31–33 , 44

Diagnosis

The male of the new species resembles that of P. pseudoflexus ( Liu, Yang & Peng, 2016) ( Liu et al. 2016: figs 13–17), but can be distinguished by: (1) embolus originating at about 8:00 o’clock position in ventral view ( Figs 31B , 33A ), while originating at about 9:00 o’clock in P. pseudoflexus ( Liu et al. 2016: figs 15, 17); (2) the median area of the genital bulb with a conic bulge in retrolateral view ( Figs 31C , 33B ), while absent in P. pseudoflexus ( Liu et al. 2016: figs 14, 16). The female of the new species resembles that of P. pseudoflexus ( Liu et al. 2016: figs 19–24), but can be distinguished by: (1) pockets close to copulatory openings, almost two times as wide as long in ventral view ( Figs 32B , 33D ), while away from posterior margin of copulatory openings, almost as long as wide in P. pseudoflexus ( Liu et al. 2016: figs 20, 22); (2) top of pockets below anterior margin of copulatory openings in ventral view ( Figs 32B , 33D ), while above anterior margin of copulatory openings in P. pseudoflexus ( Liu et al. 2016: figs 20, 22).

Etymology

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

Type material

Holotype

CHINA • ♂; Yunnan Province, Tengchong County, Old Pass , 28 km East of Tengchong; 24º57′00″ N, 98º45′00″ E; 2300 m a.s.l.; 26–31 Oct. 1998; Charles Griswold, David Kavanaugh and Chun-lin Long leg.; HNU-98–OP–2A.

Paratypes (6 ♂♂, 6 ♀♀)

CHINA – Yunnan Province • 4 ♂♂, 3 ♀♀; same collection data as for holotype; HNU-98–OP–2P • 2 ♀♀; Tengchong County, Nankang ; 24º49′00″ N, 98º46′59″ E; 2100 m a.s.l.; 4–7 Nov. 1998; Charles Griswold, David Kavanaugh and Chun-lin Long leg.; HNU-NK–21 • 1 ♂; Tengchong County, Old Pass , 28 km East of Tengchong; 24º57′00″ N, 98º45′00″ E; 2300 m a.s.l.; 26–31 Oct. 1998; Charles Griswold, David Kavanaugh and Chun-lin Long leg.; HNU-98–OP–23 • 1 ♀; Tengchong County, Old Pass , 28 km East of Tengchong; 24º57′00″ N, 98º45′00″ E; 2300 m a.s.l.; 26–31 Oct. 1998; Charles Griswold, David Kavanaugh and Chun-lin Long leg.; HNU-98–OP–24 • 1 ♂; 9 km Southeast of Pianma ; 25º59′38″ N, 98º39′49″ E; 2400 m a.s.l.; 15–17 Oct. 1998; Charles Griswold, David Kavanaugh and Chun-lin Long leg.; HNU-98–EP–34 .

Description

Male (holotype)

BODY AND HEAD. Total length 5.40. Prosoma 2.60 long, 1.90 wide. Opisthosoma 2.80 long, 1.70 wide. Clypeus height 0.15. Carapace ( Fig. 31A ) brown, sides with white hairs; carapace margin and eyes base black; three yellowish-brown longitudinal bands present in median and lateral areas, respectively; ocular area with black lateral margins, anterior area covered with dense white and sparse brown rough hairs. Fovea reddish brown, line-shaped. Cervical groove indistinct, radial groove dark brown. Eye diameter and interdistances: AME 0.50, ALE 0.30, PLE 0.30, AERW 1.70, PERW 1.60, EL 1.10. Sternum scutiform, densely covered with short brown hairs; margin dark brown. Clypeus dark brown, covered with long brown hairs, promargin with sparse hairs. Endites have a brown base, distal area greenish brown, densely covered with dark brown hairs. Labium dark brown, distal area brown, covered with dark brown hairs.

CHELICERAE ( Fig. 33C ). Brown to dark brown, covered with brown hairs; two promarginal teeth one retromarginal denticle.

LEGS. Yellowish brown to dark brown, tibiae I dark brown, femur dark brown; bearing numerous long 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 = 4.55 (1.65, 2.20, 1.00, 0.70), II = 4.80 (1.60, 1.80, 0.80, 0.60), III = 4.90 (1.60, 1.60, 1.00, 0.70), IV = 5.40 (1.75, 1.75, 1.20, 0.70). Leg formula: IV–III–II–I.

ABDOMEN ( Fig. 31A ). Cylindric, dorsum yellowish brown, with three pairs of sigillae; each side with a grayish black longitudinal band and many black twills; the posterior portion with arc markings; ventral yellowish white with many black spots; the median area with a black longitudinal band, sides with few black twills. Spinnerets dark brown.

PALP ( Figs 31B–C , 33A–B ). Longer than wide; embolus slender, originating at about 8:00 o’clock position; genital lobe protrusive; the median area of genital bulb with a triangular outgrowth in retrolateral view; tibial apophysis needle-shaped.

Female (paratypes)

BODY AND HEAD. Total length 5.40. Prosoma 2.40 long, 1.85 wide. Opisthosoma 3.00 long, 1.90 wide. Clypeus ( Fig. 32A ) height 0.15. Eye diameter and interdistances: AME 0.50, ALE 0.30, PLE 0.25, AERW 1.65, PERW 1.55, EL 1.00. Clypeus height 0.15.

LEG MEASUREMENTS. I = 4.30 (1.40, 1.70, 0.70, 0.50), II = 3.90 (1.30, 1.50, 0.60, 0.50), III = 4.80 (1.40, 1.70, 0.90, 0.80), IV = 5.20 (1.60, 1.90, 1.00, 0.70). Leg formula: IV–III–I–II.

ABDOMEN ( Fig. 32A ). Female body slightly colored, markings and other morphological features same as in male.

EPIGYNUM ( Figs 32B–C , 33D–E ). As long as wide; pockets long angular, distinctly close to copulatory openings; top of pockets almost close to anterior margin of copulatory openings; copulatory openings ()-shaped.

Distribution

China (Yunnan Province, Fig. 44 ).

Figures

Fig. 31. Ptocasius tengchongensis sp. nov., holotype, ♂ (HNU-98–OP–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. 32. Ptocasius tengchongensis sp. nov., paratype, ♀ (HNU-98–OP–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. 33. Ptocasius tengchongensis sp. nov. A–C. Holotype, ♂ (HNU-98–OP–2A). D–E. Paratype, ♀ (HNU-98–OP–2P). A. Palp, ventral view. B. Palp, retrolateral view. C. Chelicerae, posterior view. D. Epigynum, ventral view. E. Vulva, dorsal view. Scale bars = 0.1 mm.

Fig. 44. Distribution records of the species: P. geminus sp. nov. (▲), P. jietouensis sp. nov. (•) and P. tengchongensis sp. nov. (▇).