Psechrus schwendingeri Bayer 2012, sp. nov.
Creators: name: Bayer, Steffen
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Psechridae
Psechrus
Psechrus schwendingeri

description: Psechrus schwendingeri sp. nov.
Figs 78a–f, 86k
Type material. Holotype ♂ (SB 143), PHILIPPINES: Luzon: Mountain Province: Banaue, ca. N 16°55', E 121°03', ca. 1100 m, forest relict; P. Schwendinger leg. II.1981; MHNG; Paratypes: 1 s.a. ♀ (SB 144), with same data as for holotype (originally in same series); MHNG; 1 s.a. ♂ (SB 870, very close to adult moult, opisthosoma lost), PHILIPPINES: Luzon: Mountain Province: Mt. Datá, ca. N 16°52', E 120°52', ca. 2200 m; O. Koch leg. 1883–1894; F. Karsch det. Lancaria sp.; ZMB 3842.
Note on type material: The subadult male SB 870 must have been very close to the final moult when it was collected. The specific bulb structures are already visible through the old cuticula. According to the label it was collected by Otto Koch in Luzon. Mt. Datá is most likely the exact locality. The publication Beolens et al. (2009) states that Otto Koch had collected most of his material from the Philippines in expeditions with Alexander Schadenberg. Schadenberg had collected a lot of material in Northern Luzon. In the first description of a bark rat named after Schadenberg (Meyer 1895) the author stated that Schadenberg stayed a longer period of time at Mount Datá, where he collected this rat and also lots of other animals.
Additional material examined. PHILIPPINES: Luzon: Mountain Province: Mt. Datá, ca. N 16°52', E 120°52', ca. 2200 m; Otto Koch leg. 1883–1894; F. Karsch det. Lancaria sp.; 1 s.a. ♀ (SB 871, opisthosoma lost), ZMB 3842.
Additional doubtful material examined. PHILIPPINES: Luzon: Mountain Province: most likely: Bontoc, ca. N 17°05', E 120°58', ca. 900 m; C.G. Semper leg. VIII.1860; No. 235; 1 p. s.a. ♀ (SB 872), 1 juv. (SB 873), ZMH.
Etymology. The specific name is a patronym in honour of the collector of the holotype, Peter Schwendinger; noun (name) in genitive case.
Diagnosis. Males with distally hook-shaped embolus (E) with its tip resting in the cymbium alveolus (CA). Conductor partly reduced and covered with a great many very small tubercles (Figs 78a–c).
Description. Male:
Body and eye measurements. Carapace length 7.3, carapace width 5.4, anterior width of carapace 2.9, opisthosoma length 9.4, opisthosoma width 3.1. Eyes: AME 0.39, ALE 0.38, PME 0.39, PLE 0.39, AME–AME 0.27, AME–ALE 0.09, PME–PME 0.30, PME–PLE 0.37, AME–PME 0.51, ALE–PLE 0.48, clypeus height at AME 1.02, clypeus height at ALE 0.88.
Cheliceral furrow with three promarginal and four retromarginal teeth.
Measurements of palp and legs. Leg formula: 1423. Palp: 7.7 [2.8, 1.1, 1.2, 2.6]; Legs: I 61.2 [17.0, 3.4, 16.3, 17.8, 6.7], II 44.9 [12.9, 3.0, 11.3, 12.7, 5.0], III 30.1 [8.9, 2.3, 7.1, 8.3, 3.5], IV 45.7 [12.7, 2.6, 11.4, 13.5, 5.5].
Spination. Palp: 131, 000, 1201{1101}; legs: femur I 556{656}, II 556, III 434 {546}, IV 545; patella I–IV 000; tibia I– II 3036, III 2026, IV 2036; metatarsus I– III 3035, IV 3036.
Palpal femur with extremely flat ventral bulge proximally (Fig. 78d), actually not worth mentioning as modification. MC-I–II & MT-I absent.
Copulatory organ. Embolus (E) with membranous structure leading from tip to proximal section. Conductor (C), which has in fact lost its function, distally with very narrow, membranous section. Tegulum elongated and sperm duct U-shaped (Fig. 78b). Cymbium dorsally with very dense scopula covering 2/3 of cymbium. Palpal tibia rather short and broadest distally (Figs 78a–c).
Female: unknown (only subadult female known, a few measurements of the subadult female are given anyway).
Body measurements. Carapace length 5.9, carapace width 4.0, opisthosoma length 9.5, opisthosoma width 4.8.
Cheliceral furrow with three promarginal and four retromarginal teeth.
Leg formula: 1423. Measurements of metatarsi of legs. I 9.2, II 6.6, III 4.6, IV 7.0.
Palpal claw with 14 teeth.
Spination. Palp: 131, 110, 1101, 1014; legs: femur I 647, II–III 545, IV 544; patella I–IV 000; tibia I–II 3036, III 3034, IV 3033; metatarsus I–IV 3035.
Primordial copulatory organ. Pre-epigyne: Pre-MS three times broader than long. Distal endings of the lateral margins of pre-lateral lobes curved medially (Fig. 78f). Pre-epigynal field absent.
Pre-vulva: Pre-spermathecal heads very flat, located dorsally upon cross-oval pre-receptacula (Fig. 78e). Precopulatory ducts short and narrow.
Colouration of male and subadult female (see also description for Psechrus). Sternum light yellowish brown at lateral margins and with broad, light brown to red-brown, tapered patch centrally. Median bands on carapace barely serrated. Lateral bands rather broad (ca. 1.5x diameter of PME) and hardly or slightly serrated. Light longitudinal line ventrally on opisthosoma continuous and very narrow. If measured centrally on opisthosoma, its width is 0.1–0.3 times the width of one half of the cribellum.
Distribution. Philippines (Fig. 102).
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 141-143, DOI: 10.11646/zootaxa.3379.1.1, http://zenodo.org/record/6039832