Ptocasius angulatus, 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 : 5-7

Ptocasius angulatus sp. nov.

urn:lsid:zoobank.org:act:ADD08C18-F5BB-443A-9F52-11DF387097FD

Figs 1–2 , 41

Diagnosis

The new species resembles P. strupifer Simon, 1901 ( Peng 2020: fig. 275a–g), but can be distinguished by: (1) pockets present anteriorly parallel to copulatory openings in ventral view ( Figs 1B , 2A ), while pockets present in median area below copulatory openings in P. strupifer ( Peng 2020: fig. 275f); (2) lateral margins of spermathecae extending dorso-laterally outside of copulatory ducts in dorsal view ( Figs 1C , 2B ), while spermathecae dorso-median inside of copulatory ducts in P. strupifer ( Peng 2020: fig. 275f–g).

Etymology

The specific name derives from the Latin adjective ‘ angulatus ’ (‘provided with angles’).

Type material

Holotype

CHINA • ♀; Yunnan Province, 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–1A.

Paratype (1 ♀)

CHINA – Yunnan Province • 1 ♀; same collection data as for holotype; HNU-98–EP– 1P.

Description

Female (holotype)

BODY AND HEAD. Total length 4.10. Prosoma 2.10 long, 1.60 wide. Opisthosoma 2.30 long, 1.45 wide. Clypeus height 0.10. Carapace ( Fig. 1A ) brown, sides with dense white hairs; carapace margins and eye base black; ocular area covered with long rough dark brown hairs, anterior and lateral margins black with dense white hairs. Fovea short, reddish brown, cervical groove indistinct, radial groove dark brown, distinct. Eye diameter and interdistances: AME 0.50, ALE 0.25, PLE 0.25, AERW 1.50, PERW 1.40, EL 0.90. Sternum olive-shaped, densely covered with short brown hairs; median area bulged and light yellow, margin grayish yellow. Clypeus light brown with grayish black markings; anterior margin with long white hairs, narrow, height less than ½ AME. Endites and labium brown, distal area light brown, covered with black hairs.

CHELICERAE ( Fig. 2C ). Dark brown, distal area covered with long brown hairs, two promarginal teeth and one retromarginal denticle.

LEGS. No visible markings or annuli, light yellowish brown to brown. Tibiae I and II with three pairs of long ventral spines, metatarsi I and II with two pairs of long ventral spines.

LEG MEASUREMENTS. I = 3.40 (1.10, 1.40, 0.50, 0.40), II = 3.30 (1.10, 1.30, 0.50, 0.40), III = 3.90 (1.30, 1.30, 0.80, 0.50), IV = 4.30 (1.40, 1.40, 1.00, 0.50). Leg formula: IV–III–I–II.

ABDOMEN ( Fig. 1A ). Oval, dorsum yellowish brown with dark brown markings, sides with dark longitudinal bands, marginal area with one light incision; cardiac marking long and bar-shaped, the terminal area with black spots, mid-dorsally with two pairs of sigillae; ventral grayish white, the median area with a gray longitudinal band, lateral dark brown. Spinnerets brown.

EPIGYNUM ( Figs 1B–C , 2A–B ). Longer than wide; with angular pockets present antero-laterally; copulatory openings longitudinal, outline almost U-shaped, spermathecae sinuous, much complicated and close to each other, extending dorso-laterally, the distance between the margins of spermathecae indistinctly wider than that between the copulatory ducts.

Male

Unknown.

Distribution

China (Yunnan Province, Fig. 41 ).

Figures

Fig. 1.Ptocasius angulatus sp. nov., holotype, ♀ (HNU-98–EP–1A). A. Body, dorsal view.B. Epigynum, ventral view. C. Vulva, dorsal view. Scale bars: A = 0.5 mm; B–C = 0.1 mm.

Fig. 2. Ptocasius angulatus sp. nov., holotype, ♀ (HNU-98–EP–1A). A. Epigynum, ventral view. B. Vulva, dorsal view. C. Chelicerae, posterior view. Scale bars = 0.1 mm.

Fig. 41. Distribution records of the species: P. angulatus sp. nov. (▲), P. filiformus sp. nov. (•) and P. robustus sp. nov. (▇).