Psechrus antraeus Bayer & Jager 2010
Creators: name: Bayer, Steffen
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Psechridae
Psechrus
Psechrus antraeus

description: Psechrus antraeus Bayer & Jäger, 2010
Figs 27a–g, 82h,o, 85d, 88d, 91d
Psechrus antraeus Bayer and Jäger 2010: 61, figs 10–23, 55, 58–60 (Description 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; 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.
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) and the E, which is curved prolaterad in distal section (Fig. 27b). Females with median septum (MS) just slightly shorter than broad (Figs 27e, 88d). 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, 91d).
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).
Copulatory organ (see also diagnosis and general description for ancoralis -group). Conductor (C) almost straight and almost as long as T (Figs 27a–c). Palpal tibia (Figs 27a–c) 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, 88d). Median septum mostly (almost) square (Fig. 27e). Spermatheca extending laterally (Fig. 27f). 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.
Variation of copulatory organs. For variation in female copulatory organs see description and illustrations in Bayer and Jäger (2010).
Distribution. Laos (Fig. 98).
description: Published as part of Bayer, Steffen, 2012, The lace-sheet-weavers — a long story (Araneae: Psechridae: Psechrus), pp. 1-170 in Zootaxa 3379 (1) on pages 56-57, DOI: 10.11646/zootaxa.3379.1.1, http://zenodo.org/record/6039832