Psechrus antraeus Bayer & Jäger, 2010

Bayer, Steffen, 2012, The lace-sheet-weavers — a long story (Araneae: Psechridae: Psechrus), Zootaxa 3379 (1), pp. 1-170 : 56-57

publication ID	https://doi.org/ 10.11646/zootaxa.3379.1.1
DOI	https://doi.org/10.5281/zenodo.6303248
persistent identifier	https://treatment.plazi.org/id/D0272654-FFB7-587B-FF20-2E33FDD64022
treatment provided by	Felipe
scientific name	Psechrus antraeus Bayer & Jäger, 2010
status

Treatment

Psechrus antraeus Bayer & Jäger, 2010 View in CoL

Figs 27a–g View FIGURES 27 , 82h,o View FIGURES 82 , 85d View FIGURES 85 , 88d View FIGURES 88 , 91d View FIGURES 91

Psechrus antraeus Bayer and Jäger 2010: 61 View in CoL , figs 10–23, 55, 58–60 ( Description GoogleMaps of ♂ and ♀, illustration of ♂ and ♀♀). [Holotype ♀ ( SB 8 ) from LAOS: Vientiane Province: Vang Vieng, W of VV, Tham Khan, N 18°55'32.0'', E 102°24'57.7'', 302 m, in cave; P. Jäger leg. 15.III.2008; SMF; Paratypes: 1 ♂ ( SB7 ), same data as for holotype; SMF; 2 ♀♀ ( SB43–44 ) from Vang Vieng, W of VV, Tham Pou Kham, N 18°55'32.9'', E 102°24'44'', 260 m, inside limestone cave; P. Jäger leg. 15.III.2008; MHNG; 2 ♀♀ ( SB73–74 ) from same locality as SB 43–44; P. Jäger & F. Steinmetz leg. 13.III.2007; RMNH; all type material examined].

Additional material examined (2 ♀♀, 1 s.a. ♂, 1 juv.). LAOS: Vientiane Province: Vang Vieng, W of VV, Tham Pou Kham , N 18°55'32.9'', E 102°24'44'', 260 m, inside limestone cave; P. Jäger leg. 15. III.2008; 1 juv. ( SB 45 ), SMF GoogleMaps ; Same locality; P. Jäger & S. Bayer leg. 12.XI.2009; 2 ♀♀ ( SB 294–295 ) , SMF. Vang Vieng, W of VV, Tham Pou Na , N 18°55'32.5'', E 102°22'55.5'', 280 m, overgrown rockwall; P. Jäger & S. Bayer leg. 12.XI.2009; 1 s.a. ♂ ( SB 298 ), SMF. GoogleMaps

Revised diagnosis (see also diagnosis for ancoralis -group above). Males similar to P. ancoralis in having embolus (E) about as long as width of tegulum (T). Distinguished by the narrower conductor (C) (ca. 1/4 width of T, Fig. 27b View FIGURES 27 ) and the E, which is curved prolaterad in distal section ( Fig. 27b View FIGURES 27 ). Females with median septum (MS) just slightly shorter than broad ( Figs 27e View FIGURES 27 , 88d View FIGURES 88 ). Distance between copulatory openings (CO) at most half as long as entire septum length. In vulva the initial parts of copulatory ducts (CD) located clearly anterior to spermathecal heads (SH) and spermathecae ( Figs 27f View FIGURES 27 , 91d View FIGURES 91 ).

Description. Male:

Body and eye measurements. Carapace length 5.5, carapace width 3.9, anterior width of carapace 2.2, opisthosoma length 5.8, opisthosoma width 2.4. Eyes: AME 0.31, ALE 0.44, PME 0.42, PLE 0.42, AME–AME 0.11, AME–ALE 0.03, PME–PME 0.18, PME–PLE 0.26, AME–PME 0.47, ALE–PLE 0.38, clypeus height at AME 0.68, clypeus height at ALE 0.59.

Cheliceral furrow with three promarginal and five retromarginal teeth.

Measurements of palp and legs. Leg formula: 1423. Palp: 7.2 [2.5, 1.2, 1.1, 2.4]; Legs: I 53.8 [14.4, 2.6, 14.7, 15.4, 6.7], II 41.2 [11.2, 2.5, 10.9, 11.6, 5.0], III 26.4 [7.7, 2.0, 6.2, 7.1, 3.4], IV 42.4 [11.4, 2.1, 10.6, 12.4, 5.9].

Spination. Palp: 131, 010, 1101(prolateral and ventral one smaller); legs: femur I–II 566, III–IV 555; patella I–IV 000; tibia I 3038{30310}, II 3038, III 3034, IV 3036; metatarsus I 3038, II–III 3035, IV 3037.

Palpal femur without modification, rather slim ( Fig. 27d View FIGURES 27 ).

Copulatory organ (see also diagnosis and general description for ancoralis -group). Conductor (C) almost straight and almost as long as T ( Figs 27a–c View FIGURES 27 ). Palpal tibia ( Figs 27a–c View FIGURES 27 ) longer and narrower than in P. ancoralis .

Female: (Measurements of holotype first, those of other specimens as range in parentheses).

Body and eye measurements. Carapace length 5.7 (5.9–8.1), carapace width 4.0 (4.0–5.6), anterior width of carapace 2.5 (2.5–3.3), opisthosoma length 7.6 (8.8–12.6), opisthosoma width 3.6 (4.4–7.4). Eyes: AME 0.37 (0.36–0.45), ALE 0.40 (0.43–0.51), PME 0.45 (0.47–0.52), PLE 0.44 (0.43–0.51), AME–AME 0.12 (0.13–0.19), AME–ALE 0.06 (0.03–0.06), PME–PME 0.22 (0.18–0.27), PME–PLE 0.35 (0.24–0.41), AME–PME 0.44 (0.46–0.58), ALE–PLE 0.36 (0.26–0.42), clypeus height at AME 0.75 (0.98–1.24), clypeus height at ALE 0.70 (0.89–0.96).

Cheliceral furrow with three promarginal and six retromarginal teeth in holotype and one other female (three promarginal and five retromarginal in remaining females).

Measurements of palp and legs. Leg formula: 1423. Palp: 7.2 (7.5–9.7) [2.6 (2.5–3.1), 1.0 (1.1–1.4, 1.3 (1.4–2.0), 2.3 (2.5–3.2)]; Legs: I 37.9 (39.9–50.1) [10.3 (10.7–13.4), 2.4 (2.5–3.4), 10.9 (11.2–14.5), 9.9 (10.4–13.0), 4.4 (5.1–5.8)], II 29.9 (31.8–40.3) [8.8 (9.1–11.6), 2.0 (2.3–3.1), 8.0 (8.5–10.7), 7.6 (8.0–10.2), 3.5 (3.9–4.7)], III 20.8 (21.8–28.8) [6.3 (6.6–8.7), 1.7 (1.7–2.4), 5.1 (5.3–7.1), 5.2 (5.5–7.3), 2.5 (2.7–3.3)], IV 30.9 (33.0–40.6) [9.1 (9.5–11.8), 1.9 (2.0–2.8), 7.9 (8.6–11.2), 8.0 (8.4–10.6), 4.0 (4.2–4.5)].

Palpal claw with 13 (13–16) teeth.

Spination. Palp: 131 (131), 110 (110), 1101 (1101), 1013 (1014,2013); legs: femur I–II 556 (556), III 555 (555), IV 555 (555,545,554); patella I–IV 000; tibia I–II 3038 (3038), III 3234 (3134,3136), IV 3133 (3033,3136); metatarsus I–III 3035 (3035), IV 3035 (3035,3034).

Copulatory organ (see also diagnosis and general description of ancoralis -group). Epigyne without epigynal field ( Figs 27e View FIGURES 27 , 88d View FIGURES 88 ). Median septum mostly (almost) square ( Fig. 27e View FIGURES 27 ). Spermatheca extending laterally ( Fig. 27f View FIGURES 27 ). Colouration of male and female (see also description for ancoralis -group and Psechrus ). Median bands on carapace slightly serrated. Lateral bands narrow (almost diameter of PME) and slightly serrated. Light longitudinal line ventrally on opisthosoma continuous and rather narrow. If measured centrally on opisthosoma, its width is ca. 1/2 the width of one half of the cribellum.