Psechrus triangulus Yang, Zhang, Zhu & Song, 2003

Bayer, Steffen, 2012, The lace-sheet-weavers — a long story (Araneae: Psechridae: Psechrus), Zootaxa 3379 (1), pp. 1-170 : 100-102

publication ID	https://doi.org/ 10.11646/zootaxa.3379.1.1
DOI	https://doi.org/10.5281/zenodo.5255918
persistent identifier	https://treatment.plazi.org/id/D0272654-FFE3-5826-FF20-29B1FDC14636
treatment provided by	Felipe
scientific name	Psechrus triangulus Yang, Zhang, Zhu & Song, 2003
status

Treatment

Psechrus triangulus Yang, Zhang, Zhu & Song, 2003 View in CoL

Figs 54a–g View FIGURES 54 , 86b View FIGURES 86 , 89b View FIGURES 89 , 92b View FIGURES 92

Psechrus triangulus Yang, Zhang, Zhu and Song 2003: 43 View in CoL , figs A–F ( Description GoogleMaps of ♂ and ♀, illustration of ♂ and ♀). [Holotype ♀ ( SB 881 ) from CHINA: Yunnan Province: Yunlong County, Jiancao, ca. N 26°00', E 99°21', 1700–2500 m; E.B. Yang leg. 30.IV.2002; MHBU; Paratypes: 1 ♂ ( SB 882 ), 5 ♀♀, with same data as for holotype; MHBU, holotype and male paratype examined, female paratypes not available on request, thus not examined].

Revised diagnosis (see also diagnosis for sinensis -group above). Males similar to P. sinensis in having long embolus base (EB) (longer than conductor [C]), possessing numerous tubercles distally ( Figs 52b–c View FIGURES 52 , 54b–c View FIGURES 54 ). Distinguished by the broad distal part of embolus (E), the two semicircular, platform-like apophyses at EB and the tip of C pointing apically ( Fig. 54b View FIGURES 54 ). Females similar to P. sinensis in having median septum (MS) with posterior part at least four times broader than anterior part ( Figs 53a View FIGURES 53 , 54e View FIGURES 54 ). Copulatory ducts (CD) without twist, the bulbous sections of CD about as broad as spermatheca ( Figs 53b View FIGURES 53 , 54f View FIGURES 54 ). Distinguished by the triangular shape of MS ( Fig. 54e View FIGURES 54 ), the narrower copulatory ducts and the spermatheca laterally clearly extending beyond CD ( Fig. 54f View FIGURES 54 ). Additionally, in epigyne the anterior margins of the lateral lobes are visible ( Fig. 54e View FIGURES 54 ).

Description. Male:

Body and eye measurements. Carapace length 7.4, carapace width 5.4, anterior width of carapace 2.9, opisthosoma length 9.5, opisthosoma width 4.7. Eyes: AME 0.38, ALE 0.40, PME 0.42, PLE 0.42, AME–AME 0.17, AME–ALE 0.08, PME–PME 0.26, PME–PLE 0.36, AME–PME 0.52, ALE–PLE 0.44, clypeus height at AME 0.96, clypeus height at ALE 0.81.

Cheliceral furrow with three promarginal and four retromarginal teeth.

Measurements of palp and legs. Leg formula: 1423. Palp: 10.0 [3.6, 1.7, 1.2, 3.5]; Legs: I 51.5 [13.6, 3.0, 14.3, 13.9, 6.3], II 40.2 [11.0, 3.0, 10.9, 10.7, 4.6], III 27.8 [8.2, 2.2, 6.6, 7.4, 3.4], IV 40.5 [11.4, 2.6, 10.5, 11.3, 4.7].

Spination. Palp: 131, 110(both spines very small), 1101(all spines very small); legs: femur I 516, II 526 , III 536 {335}, IV 524 ; patella I–IV 000; tibia I 3037, II 3036 , III 2026 {2036}, IV 2036; metatarsus I– IV 3035 .

Palpal femur ventrally modified with rounded bulge ( Fig. 54d View FIGURES 54 ).

Copulatory organ (see also diagnosis and general description for sinensis -group). Conductor (C) apically distinctly narrower than centrally but its tip rounded ( Fig. 54b View FIGURES 54 ), not pointed. Embolus (E) strangely folded. Sperm duct with broad V-shaped course ( Fig. 54b View FIGURES 54 ). Palpal tibia distinctly short ( Figs 54a–c View FIGURES 54 ).

Female:

Body and eye measurements. Carapace length 7.3, carapace width 4.1, anterior width of carapace 2.2, opisthosoma length 9.9, opisthosoma width 5.8. Eyes: AME 0.38, ALE 0.42, PME 0.43, PLE 0.43, AME–AME 0.17, AME–ALE 0.08, PME–PME 0.24, PME–PLE 0.38, AME–PME 0.62, ALE–PLE 0.47, clypeus height at AME 1.08, clypeus height at ALE 0.94.

Cheliceral furrow with three promarginal and four retromarginal teeth.

Measurements of palp and legs. Leg formula: 1423. Palp: 9.2 [3.1, 1.4, 1.6, 3.1]; Legs: I 40.8 [11.2, 3.3, 11.3, 10.2, 4.8], II 33.0 [9.6, 2.9, 9.0, 7.6, 3.9], III 23.3 [6.9, 2.2, 5.5, 5.8, 2.9], IV 33.2 [9.5, 2.6, 8.8, 8.3, 4.0].

Palpal claw with 15 teeth.

Spination. Palp: 131, 110, 2101{1101}, 1014; legs: femur I 516, II 515 , III 535 , IV 524 ; patella I–IV 000; tibia I 3038, II 3036 {3037} III 2034, IV 2035; metatarsus I– IV 3035 .

Copulatory organ (see also diagnosis and general description of sinensis -group). Epigynal field with anteriolateral extensions, associated with the long and narrow epigynal muscle sigilla. Slit sense organs outside EF ( Fig. 54e View FIGURES 54 ). In comparison to P. sinensis spermathecal heads arising further dorsally at spermathecae ( Fig. 54f View FIGURES 54 ).

Colouration of male and female (see also description for sinensis -group and Psechrus ). Median bands on carapace at most slightly serrated. Lateral bands very narrow (at most 0.3 diameter of PME) and at most slightly lobed. Light longitudinal line ventrally on opisthosoma strongly constricted subdistally and quite broad. If measured centrally on opisthosoma, its width is slightly less than or as broad as the width of one half of the cribellum (ca. 0.8–1.0 of one half of the cribellum). Distal part (patch) broader than main section.

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