Agyneta nigripes Simon 1884

• Main Author: Dupérré, Nadine
• Format: Text
• Language: unknown
• Published: Zenodo 2013
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Arachnida; Araneae; Linyphiidae; Agyneta; Agyneta nigripes; Nunavut; Austin; Canada; Thumb; Seta; Leech; Fang; Trident; Hazen Camp; Tundra
• Online Access: https://dx.doi.org/10.5281/zenodo.6162310; https://zenodo.org/record/6162310

Agyneta nigripes (Simon 1884) Figs 123–129, map 6 Microneta nigripes Simon 1884: 439, f. 222–224. (Description Ƥ). Tmeticus levinsenii Sørensen 1898: 199. Micryphantes nigripes Lessert 1910: 233, f. 132. Ischnyphantes nigripes Simon 1929: 541, 716. Meioneta nigripes Locket & Millidge 1953: 346, f. 207 D. Agyneta nigripes Saaristo & Koponen 1998: 568, f. 2 A-D, 3 A-F. (Transferred Ƥ from Meioneta ). Type material: Microneta nigripes Simon 1884, 3 HOLOTYPE, Ƥ ALLOTYPE from Valais: hospice du Grand- Saint-Bernard. Alpes-Maritime, la Madone-de-Fenestres près Saint-Martin. Sur les hauts sommets des Alpes près des neiges. (MNHN), NOT EXAMINED. Diagnosis: Males are diagnosed from most species by the bifid tip of their lamella characteristica (Fig. 123). From A. maritima by the absence of a posterior pocket of the paracymbium (Fig. 123). Females are distinguished from most Agyneta by their deep pit hook depression (Fig. 127). From closely related species by the oblique sides of proximal part of scape, straight in A. rurestris , A. jacksoni , A. maritima and A. dynica (Figs 112, 120, 134, 141). Description: Male : Total length 1.89; carapace length 0.77, width 0.60. CEPHALOTHORAX: Carapace dark brown, shiny, finely reticulate; suffused with gray along margin, radiating lines; trident mark present. Sternum brown suffused with gray, darker along margin. Clypeus height 2. Chelicerae orange apical part lighter, not excavated; seta-tipped tubercles absent; promargin five teeth, retromargin five denticles, margins without projections near base of fang. Cheliceral stridulatory organ ~ 20 striae, well spaced throughout. ABDOMEN: Uniformly light to dark gray. LEGS: Light yellow; leg I total length: 2.36; leg III total length: 1.85; Tm I: 0.30, Tm IV: absent. GENITALIA: Palpal retrolateral tibial apophysis rounded, smooth; dorsal tibial apophysis triangular, rugose; two retrolateral trichobothria and a dorsal one (Fig. 123). Cymbium triangular; glabrous depression present (Fig. 123); dorsal cymbial tubercle pointed, smooth; ventral cymbial tubercle absent; prolateral notch shallow (Fig. 124). Paracymbium apical pocket medium, anterior pocket curved and short, posterior pocket absent (Fig. 123). Embolus tip wide, pointed and concave; basally with two small spines; Fickert’s gland absent; ventral lamella small, transparent; thumb short reaching well below the embolus proper (Fig. 125). Embolus proper set apically, dorsal part narrower (Fig. 125). Anterior terminal apophysis short, pointed with a few protrusions; posterior terminal apophysis narrow, striate; lamella characteristica large, margin serrated (Fig. 126). Female : Total length 2.00; carapace length 0.74, width 0.61. CEPHALOTHORAX: Same coloration as male. Chelicerae yellow; promargin four teeth, retromargin four denticles. Cheliceral stridulatory organ visible ~ 23 striae, well spaced. ABDOMEN: Same as male. LEGS: Same as male; palpal tibia and tarsus brownish, tarsal claw absent; leg I total length: 2.18; leg III total length: 1.71; Tm I: 0.30, Tm IV: absent. GENITALIA: Epigynum with wide proximal part of scape, sides straight and slightly oblique; epigynal slits oval and short; pit hook depression deep (Fig. 127); lateral lobes wide and very short; stretcher and pit small (Fig. 128). Median part of scape long and wide, wider apically; genital pores situated at base of lateral lobes (Fig. 129). Internal genitalia with a rounded ventral receptacula and a small triangular dorsal one (Figs 128, 129). Other material examined: CANADA: Labrador: Joksut, 18.viii. 1927, 3313Ƥ, D. Austin (MCZ). Nunavut: Hazen Camp, 30.v. 1964, 19.viii. 1963, 132Ƥ, R. Leech (MCZ). Distribution: Holarctic (Tanasevitch & Koponen 2007). : Published as part of Dupérré, Nadine, 2013, Taxonomic revision of the spider genera Agyneta and Tennesseellum (Araneae, Linyphiidae) of North America north of Mexico with a study of the embolic division within Micronetinae sensu Saaristo & Tanasevitch 1996, pp. 1-189 in Zootaxa 3674 (1) on pages 42-44, DOI: 10.11646/zootaxa.3674.1.1, http://zenodo.org/record/283954 : {"references": ["Simon, E. (1884) Les arachnides de France. Paris, 5, 180 - 885.", "Sorensen, W. (1898) Arachnida Groenlandica (Acaris exceptis). Videnskabelige Meddelelser Naturhistorisk Forening i Kobenhavn, 1898, 176 - 235.", "Lessert, R. (1910). Catalogue des invertebres de la Suisse. Fasc. 3, Araignees. Musee d'histoire naturelle de Geneve, 635 pp.", "Simon, E. (1929) Les arachnides de France. Synopsis generale et catalogue des especes francaises de l'ordre des Araneae; 3 e partie. Paris, 6, 533 - 772.", "Locket, G. H., & Millidge, A. F. (1953) British spiders. Ray Society, London, 449 pp.", "Saaristo, M. I. & Koponen, S. (1998) A review of northern Canadian Spiders of the genus Agyneta (Araneae: Linyphiidae), with descriptions of two new species. Canadian Journal of Zoology, 76 (3), 566 - 583.", "Tanasevitch, A. V. & Koponen, S. (2007) Spiders (Aranei) of the southern tundra in the Russian plain. Arthropoda Selecta, 15, 295 - 345."]}