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

description: Psechrus steineri Bayer & Jäger, 2010
Figs 30a–g, 85f, 88f, 91f
Psechrus steineri Bayer and Jäger 2010: 59, figs 1–9, 54, 57 (Description of ♂ and ♀, illustration of ♂ and ♀). [Holotype ♀ (SB 65) from LAOS: Khammouan Province: Ban Nong Ping, Xe Bangfai cave system, Tham Pha Leusi, N 17°22'23.4'', E 105°50'28.4'', ca. 300 m, inside cave; H. Steiner leg. 15.II.2007; SMF; Paratype: 1 ♂ (SB 64), same data as for holotype; SMF; all type material examined].
Additional material examined. LAOS: Khammouan Province: Ban Nong Ping, Xe Bangfai cave system, Tham Pha Leusi, N 17°22'23.4'', E 105°50'28.4'', ca. 300 m, inside cave; H. Steiner leg. 15. II.2007; 1 juv. (SB 66), SMF.
Revised diagnosis (see also diagnosis for ancoralis -group above). Males similar to P. khammouan in having bulky tegulum (T) and narrow conductor (C). Distinguished by the shorter embolus (E) and C, the even more bulky and larger T (Figs 30a–c), the differently shaped embolus base (EB) and the median ridge distally on conductor (Fig. 30b). Females similar to P. khammouan in having median septum (MS) with lateral margins diverging (Figs 29e, 30e), initial sections of copulatory ducts (CD) running transversally and spermathecal heads clearly separated from spermathecae (Figs 29b, 30f). Distinguished by the strongly diverging margins of MS causing anterior sections running almost parallel with epigastric furrow (Fig. 30e). Moreover, CD distinctly shorter (Fig. 30f).
Description. Male:
Body and eye measurements. Carapace length 8.4, carapace width 5.8, anterior width of carapace 3.1, opisthosoma length 9.6, opisthosoma width 3.8. Eyes: AME 0.42, ALE 0.48, PME 0.52, PLE 0.49, AME–AME 0.22, AME–ALE 0.06, PME–PME 0.35, PME–PLE 0.39, AME–PME 0.62, ALE–PLE 0.43, clypeus height at AME 1.04, clypeus height at ALE 0.95.
Cheliceral furrow with three promarginal and four retromarginal teeth.
Measurements of palp and legs. Leg formula: 1423. Palp: 9.8 [3.6, 1.8, 1.6, 2.8]; Legs: I 65.9 [16.9, 3.9, 18.5, 19.5, 7.1], II 49.0 [13.0, 3.6, 13.5, 13.2, 5.7], III 33.9 [9.8, 2.8, 8.3, 9.1, 3.9], IV 50.6 [13.5, 3.0, 13.0, 14.7, 6.4].
Spination. Palp: 131, 010, 0100; legs: femur I 666, II 566, III 656{555}, IV 565; patella I–IV 000; tibia I 3037{3038}, II 3038, III–IV 3035; metatarsus I–III 3035, IV 3034.
Palpal femur not very slim, without modification (Fig. 30d).
Copulatory organ (see also diagnosis and general description for ancoralis -group). Conductor (C) distally folded ventrad (Figs 30b–c). Tegulum with rounded “corner” (Fig. 30b) close to the arising point of E. Palpal tibia (Figs 30a–c) relatively short and bulky (Figs 30a–c).
Female:
Body and eye measurements. Carapace length 8.2, carapace width 5.5, anterior width of carapace 3.4, opisthosoma length 10.2, opisthosoma width 4.6. Eyes: AME 0.47, ALE 0.50, PME 0.50, PLE 0.49, AME–AME 0.18, AME–ALE 0.02, PME–PME 0.29, PME–PLE 0.48, AME–PME 0.65, ALE–PLE 0.50, clypeus height at AME 1.19, clypeus height at ALE 1.04.
Cheliceral furrow with three promarginal and four (five, right) retromarginal teeth.
Measurements of palp and legs. Leg formula: 1423. Palp: 9.5 [3.3, 1.5, 1.9, 2.8]; Legs: I 50.1 [13.9, 3.4, 14.2, 13.0, 5.6], II 40.0 [11.4, 3.2, 10.8, 10.2, 4.4], III 27.6 [8.3, 2.3, 6.8, 7.1, 5.1], IV 41.1 [11.8, 2.8, 10.6, 10.8, 5.1].
Palpal claw with 13 teeth.
Spination. Palp: 131{141}, 110, 1101, 1014; legs: femur I–II 556, III 555, IV 554; patella I–IV 000; tibia I–II 3038, III 3134(dorsal one small), IV 3135(dorsal one small); metatarsus I–IV 3035.
Copulatory organ (see also diagnosis and general description of ancoralis -group). Epigynal muscle sigilla and slit sense organs outside epigynal field (Fig. 30e). Spermathecal heads located anterio-medially. Spermatheca irregularly shaped (Fig. 30f, 91f).
Colouration of male and female (see also description for ancoralis -group and Psechrus). Median bands on carapace not serrated. Lateral bands extremely narrow or not even recognisable (at most 1/4 diameter of PME), not serrated. Light longitudinal line ventrally on opisthosoma continuous and narrow. If measured centrally on opisthosoma, its width is ca. 1/2 the width of one half of the cribellum.
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 62-64, DOI: 10.11646/zootaxa.3379.1.1, http://zenodo.org/record/6039832