Psechrus fuscai, Bayer, 2012

Bayer, Steffen, 2012, The lace-sheet-weavers — a long story (Araneae: Psechridae: Psechrus), Zootaxa 3379 (1), pp. 1-170 : 109-110

publication ID	https://doi.org/ 10.11646/zootaxa.3379.1.1
DOI	https://doi.org/10.5281/zenodo.6303180
persistent identifier	https://treatment.plazi.org/id/D0272654-FFEC-582E-FF20-28FAFDC1469D
treatment provided by	Felipe
scientific name	Psechrus fuscai
status	sp. nov.

Treatment

Psechrus fuscai View in CoL sp. nov.

Figs 59a–c View FIGURES 59 , 82d View FIGURES 82 , 89e View FIGURES 89 , 92e View FIGURES 92

Type material. Holotype ♀ ( SB 954 ), CHINA: Yunnan Province: Gongshan Co., Bingzhongluo Township , trail between Niwaluo and Fuscai, N 28°01'24'', E 98°32'59'', 2345 m; J.A. Miller leg. 16.VIII.2006; field no. JM 06081601 , | GLGS06-006 |; CAS 9032230 . GoogleMaps

Etymology. The specific name refers to the type locality; term (name of village) in apposition.

Diagnosis (see also diagnosis for sinensis -group above). Female similar to P. tingpingensis in having median septum (MS), not longer than broad ( Fig. 59a View FIGURES 59 ) but minimally broader than long, and twisted copulatory ducts (CD) with their initial sections running more or less transversally medially ( Fig. 59b View FIGURES 59 ). Distinguished by the sack-like MS, the peculiar, flattened, glossy fields in the areas of copulatory openings (CO) ( Fig. 59a View FIGURES 59 , 89e View FIGURES 89 ) and the clearly broader distal sections (in comparison with the proximal sections) of copulatory ducts (CD) ( Fig. 59b View FIGURES 59 ).

Description. Male: unknown.

Female:

Body and eye measurements. Carapace length 10.0, carapace width 6.9, anterior width of carapace 4.3, opisthosoma length 12.5, opisthosoma width 6.6. Eyes: AME 0.46, ALE 0.51, PME 0.51, PLE 0.51, AME–AME 0.29, AME–ALE 0.09, PME–PME 0.42, PME–PLE 0.50, AME–PME 0.83, ALE–PLE 0.70, clypeus height at AME 1.22, clypeus height at ALE 1.18.

Cheliceral furrow with three promarginal and four retromarginal teeth.

Measurements of palp and legs. Leg formula: 1243. Palp: 12.5 [4.3, 1.8, 2.2, 4.2]; Legs: I 56.9 [16.3, 4.2, 15.5, 14.7, 6.2], II 45.6 [13.2, 3.8, 12.3, 11.4, 4.9], III 32.6 [9.9, 3.0, 8.1, 7.9, 3.7], IV 43.8 [12.7, 3.4, 11.5, 11.4, 4.8].

Palpal claw with 14 teeth.

Spination. Palp: 131, 110, 1101, 1014; legs: femur I– II 516 , III 435 , IV 434 ; patella I–IV 000; tibia I 3036, II 3036 {3035} III 2034, IV 2035; metatarsus I– IV 3035 .

Copulatory organ (see also diagnosis and general description of sinensis -group). Slit sense organs and epigynal muscle sigilla outside epigynal field ( Fig. 59a View FIGURES 59 ). Spermathecal heads upon short stalks. Entire vulva irregularly shaped, right CD distinctly larger than left one ( Fig. 59b View FIGURES 59 ).

Colouration (see also description for sinensis -group and Psechrus ). Median bands on carapace hardly serrated ( Fig. 82d View FIGURES 82 ). Lateral bands very narrow (at most 0.3 diameter of PME) and —if at all— slightly serrated ( Fig. 82d View FIGURES 82 ). Light longitudinal line ventrally on opisthosoma constricted subdistally and medium sized to broad. If measured centrally on opisthosoma, its width is ca. 0.7 of one half of the cribellum. Distal part of longitudinal line slightly broader than main section.

Remarks: At present it cannot be clarified if the irregular shape of the vulva is a species-specific character or if it should be regarded as malformation of this particular female. The latter seems more likely because in all other Psechrus species , the female copulatory organ is bilaterally symmetrical.

Distribution. China ( Fig. 96 View FIGURE 96 ).