Agyneta maritima Emerton 1919

• Main Author: Dupérré, Nadine
• Format: Text
• Language: unknown
• Published: Zenodo 2013
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Arachnida; Araneae; Linyphiidae; Agyneta; Agyneta maritima; Arctic; Nunavut; Yukon; Northwest Territories; Ellesmere Island; Canada; Devon Island; Rasmussen; Thumb; Seta; Leech; Fang; Trident; Hazen Camp; Meade; Norman Wells; Firth River; Truelove Inlet; Rasmussen Basin; Mancha Creek; Baker Lake; Barrow; Brooks Range; north slope; Tundra; Alaska; Cotton-grass; Siberia
• Online Access: https://dx.doi.org/10.5281/zenodo.6162312; https://zenodo.org/record/6162312

Agyneta maritima (Emerton 1919) Figs 26, 130–136, map 7 Microneta maritima Emerton 1919: 4, pl. 1, f. 8–10. (Description 3). Meioneta maritima Leech 1966: 186, f. 62–64. (Transferred 3 from Microneta , description Ƥ). Meioneta alaskensis Holm 1960: 127, f. 32–34. (Holotype 3, allotype Ƥ from Alaska, Meade River (157 º: 71 º) 8-9 Aug. 1958, C. Lindroth, MCZ) EXAMINED. Agyneta maritima Eskov 1992: 75, 81. (Transferred from Meioneta and Meioneta alaskensis Holm 1960 was synonomized with A. maritima . This synonymy was rejected by Saaristo and Koponen 1998. SYNONYMY REAFFIRMED). Agyneta alaskensis Saaristo & Koponen 1998: 574, f. 8 A–C, E. Diagnosis: Males are distinguished from most Agyneta by the bifid tip of their lamella characteristica (Fig. 130). To distinguish from A. nigripes , see diagnosis of the latter. Females are distinguished from most Agyneta by the presence of a deep pit hook depression (Fig. 134). From closely related species by their wider pit hook depression (Fig. 134), narrower in A. rurestris , A. jacksoni and A. dynica (Figs 112, 120, 127, 141). Description: Male : Total length 2.06; carapace length 0.88, width 0.69. MAP. 7. Localities of Agyneta maritima (Emerton 1919). CEPHALOTHORAX: Carapace dark brown, shiny, finely reticulate; suffused with dark gray along margin, radiating lines; trident mark present. Sternum brown strongly suffused with dark gray. Clypeus height 2. Chelicerae orange-brown, apical part lighter, strongly excavated; ~ 12 seta-tipped tubercles; promargin two denticles, retromargin three denticles, both margins with rounded projections near base of fang (Fig. 26). Cheliceral stridulatory organ ~ 37 striae, well spaced throughout. ABDOMEN: Uniformly dark gray. LEGS: Yellow-orange; leg I total length: 2.82; leg III total length: 2.13; Tm I: 0.24, Tm IV: absent. GENITALIA: Palpal retrolateral tibial apophysis short, rugose; dorsal tibial apophysis wide, rugose; two retrolateral trichobothria and a dorsal one (Fig. 130). Cymbium triangular; glabrous depression present (Fig. 130); dorsal cymbial tubercle triangular, smooth; ventral cymbial tubercle absent; prolateral notch shallow (Fig. 131). Paracymbium apical pocket short, anterior and posterior pockets short and curved (Fig. 130). Embolus tip pointed, concave; dorso-ventrally spiny; basally with two spurs; Fickert’s gland absent; ventral lamella serrated, transparent; thumb short reaching well below the embolus proper (Fig. 132). Embolus proper set apically, dorsal part wider and serrated (Fig. 132). Anterior terminal apophysis narrow with long protrusions; posterior terminal apophysis wide, striate; lamella characteristica large, margin dentate basally, ending in four large spikes (Fig. 133). Female : Total length 2.16; carapace length 0.81, width 0.63. CEPHALOTHORAX: Same coloration as male. Chelicerae yellow; promargin four teeth, retromargin five denticles. Cheliceral stridulatory organ visible ~ 26 striae, well spaced. ABDOMEN: Same as male. LEGS: Same as male; palpal tibia and tarsus brownish, tarsal claw absent; leg I total length: 2.81; leg III total length: 2.21; Tm I: 0.26; Tm IV: absent. GENITALIA: Epigynum with wide proximal part of scape, sides straight and vertical; epigynal slits oval and short; pit hook depression deep (Fig. 134); lateral lobes wide and short; stretcher seemingly absent (Fig. 135). Median part of scape long and wide with constrictions; genital pores situated at base of lateral lobes pockets (Fig. 136). Internal genitalia with a rounded ventral receptacula and a small, oval dorsal one (Figs 135, 136). Other material examined: CANADA: Northwest Territories : Norman Wells, 25.vi. 1949, 231Ƥ, W. Mason (CNC). Nunavut : Baker Lake, 14.vii. 1947, 131Ƥ, T. Freeman (AMNH); Ellesmere Island, 04.vii. 1980, 23, J.R. Smith (CNC); Hazen Camp, 06.vi. 1963, 131Ƥ, 10.vii. 1964, 131Ƥ, 16.vi. 1964, 23, 20.vi. 1964, 233Ƥ, 28.vi. 1964, 1Ƥ, 02.viii. 1964, 3Ƥ, R. Leech (CNC); Rasmussen Basin, 08.viii. 1977, cotton grass meadow, 131 Ƥ, T. Hogg (DBC); Truelove Inlet, Devon Island, 16–21. vi. 1973, 1 Ƥ, J. Daley (DBC). USA: Alaska : Brooks Range, Araktuvuk Pass, on mountain, 3.2km W of village, 16.viii. 1960, along stream, 1 Ƥ, A. Holm, O. Martensson (AMNH); Brooks Range, Feniak Lake, 02.viii. 1961, 131Ƥ, A. Holm, O. Martensson (AMNH); North Slope Brgh., Meade River, 96km S Barrow, 06.vi. 1978, 23, 15.vi. 1978, 332Ƥ, 17.vi. 1978, 131Ƥ, 24.vi. 1978, 131Ƥ, 27.vi. 1978, 131Ƥ, 02.vii. 1978, 731Ƥ, 05.vii. 1978, 1Ƥ, 11.vii. 1978, 233Ƥ, 20.vii. 1978, 436Ƥ, 20.viii. 1978, 2Ƥ, 10.viii. 1980, 1Ƥ, B. Vogel (AMNH); North Slope, lake, 1.6km W Jago river, 23.vii–06.viii. 1962, tundra, 131 Ƥ, C. Lewis (AMNH); SW Rock Mountain, 1264m, 13–14.vi. 1994, pitfalls, alpine tundra, E. West (UWBM); Yukon Border, Firth River, E facing slope of Mountain, 1.6km SE Mancha Creek, 12.viii. 1961, limestone, 2 Ƥ, K. Stone (AMNH). Distribution: Siberian-Nearctic (Tanasevitch & Koponen 2007). Note: After examining the holotypes of A. maritima and A. alaskensis, studying the palpal embolic division and the female internal genitalia of many specimens from Northwest Territories, Nunavut and Alaska, I found no consistent morphological differences suggesting two distinct species. I did observed the variation in size, carapace color and serration of the male palpal lamella characteristica mentioned by Saaristo & Koponen 1998 (p. 572, 574; figs 6, 8). But those minor morphological differences fall within the range of variation observed in other species of Agyneta (eg. A. fillmorana , A. sheffordiana, A. amersaxatilis ), therefore A. alaskensis synonymy with A. maritima is reaffirmed following Eskov (1994). : 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 44-47, DOI: 10.11646/zootaxa.3674.1.1, http://zenodo.org/record/283954 : {"references": ["Emerton, J. H. (1919) The spiders collected by the Canadian Arctic Expedition 1913 - 18. In Report of the Canadian Arctic Expedition, 3 (H), 1 - 8.", "Holm, A. (1960) On a collection of spiders from Alaska. Zoologiska Bidrag Fran Uppsala, 33, 109 - 134.", "Eskov, K. Y. (1992) New data on the linyphiid spider fauna of south Siberia (Aranei Linyphiidae). Arthropoda Selecta, 1 (2), 73 - 82.", "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.", "Eskov, K. Y. (1994) Catalogue of the linyphiid spiders of northern Asia (Arachnida, Araneae, Linyphiidae). Pensoft Publishers, Sofia, 144 pp."]}