Agyneta fabra Keyserling 1886
Creators: name: Dupérré, Nadine
Publisher: name: Zenodo
Year: 2013
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Linyphiidae
Agyneta
Agyneta fabra

description: Agyneta fabra (Keyserling 1886)
Figs 21, 390–401, map 26
Erigone fabra Keyserling 1886b: 167, pl. 17, f. 229. (Description Ƥ). Microneta bowditchiae Bishop 1924: 26, f. 1–4.
Bathyphantes wana Chamberlin 1925: 121, f. 30–32. (Description 3). Microneta fabra Crosby & Bishop 1928: 1049.
Meioneta fabra Kaston 1948: 139, f. 295–296. (Transferred Ƥ from Microneta). Erigone zygia Keyserling 1886: 197, pl. 18, f. 257a. (Description Ƥ). (Ƥ Holotype not examined). NEW SYNONYMY. Bathyphantes zygia Banks 1892: 45.
Meioneta zygia Chamberlin & Ivie 1944: 92. (Transferred Ƥ from Bathyphantes). Agyneta fabra Buckle et al. 2001: 100. (Transferred from Meioneta).
Type material: Erigone fabra Keyserling 1886, 3 HOLOTYPE. (BMNH), NOT EXAMINED.
Diagnosis: Males can be differentiated from all other species in Agyneta by the presence of a mastidion (Figs 21, 395), from other species of the group by the rugose, equal sized dorsal and ventral cymbial tubercles (Fig. 391). Females can be distinguished from other Agyneta species by their abdominal pattern (Fig. 396), from other species of the group and A. regina by the presence of a shallow or deep pit hook depression (Figs 397, 398).
Description: Male: Total length 2.64; carapace length 1.15, width 0.80.
CEPHALOTHORAX: Carapace dark orange-brown, shiny, finely reticulate; lightly suffused with gray along margin and radiating lines; sometimes with the dark gray trident mark. Sternum, orange brown, suffused with gray. Clypeus height 2. Chelicerae excavated, swollen, dark orange-brown with mastidion (Fig. 395); ~ 15 seta-tipped tubercles; promargin four teeth (situated in the median part), dorsal surface with large bulge, retromargin four denticles and a large projection at base of the fang. Cheliceral stridulatory organ with ~ 34 striae, evenly spaced. ABDOMEN: Uniformly gray, or pale off-white with four dark spots medially (Fig. 394). LEGS: Yellow-orange; palp dark brown, almost black; leg I total length: 5.12; leg III total length: 3.41; Tm I: 0.24, Tm IV: absent. GENITALIA: Palpal tibia retrolateral tibial apophysis absent; dorsal tibial apophysis small, rugose; two retrolateral trichobothria and a dorsal one (Fig. 390). Cymbium with conical extension; glabrous depression present (Fig. 390); dorsal and ventral tubercles rugose, more or less of equal size; prolateral notch deep (Fig. 391). Paracymbium apical pocket medium, anterior pocket long and curved, posterior pocket absent (Fig. 390). Embolus tip curved; small spines basally and ventrally; Fickert’s gland elongated set basally; ventral lamella absent; thumb long going beyond the embolus proper (Fig. 392). Embolus proper set apically with large prong near base (Fig. 392). Anterior terminal apophysis large, well sclerotized with few protrusions; posterior terminal apophysis large, well sclerotized; lamella characteristica with heavily sclerotized tip and with numerous short spikes (Fig. 393).
Female: Total length 2.46; carapace length 0.972, width 0.753.
MAP. 26. Localities of Agyneta fabra (Keyserling 1886), distribution based on material examined, distribution based on Paquin et al. 2010.
CEPHALOTHORAX: Carapace yellow, shiny, finely reticulate, lightly suffused with gray along radiating lines and margin. Sternum yellowm lightly suffused with gray. Chelicerae promargin four teeth, retromargin four denticles. Cheliceral stridulatory organ ~24 striae, well spaced. ABDOMEN: Off-white with two lateral, basal dark marks, or off-white with four dark spots dosally (Fig. 396). LEGS: Light yellow, palpal tarsal claw absent; leg I total length: 3.87; leg III total length: 2.76; Tm I: 0.29, Tm IV: absent. GENITALIA: Epigynum with wide proximal part of scape, sides slightly widening apically; epigynal slits large and oval; pit hook depression variable (Figs 397, 398); lateral lobes long; stretcher medium; pit deep (Figs 399, 401). Median part of scape long and wide; genital pores positioned at the base of lateral lobes (Fig 400, 401). Internal genitalia with oval receptacula ventrally and small a rounded receptacula dorsally (Figs 399, 400). GENITALIA VARIATION: Width of the proximal part of scape; the deepness of the pit hook depression (Figs 397, 398).
Other material examined: CANADA: Alberta: Athabasca, 09–23.vii.1986, cultivated field, 13, T. Rypien, R. Holmberg (DBC); Barnwell Grazing Reserve, 28.v.1993, pitfalls in prairie, 13, D. Johnson (DBC); Lethbridge, 28.v–04. vii.1981, 13, 02–09. vii.1981, 13, K. Richards (DBC); near Baptiste Lake, 23.v–07. vi.1988, 1 Ƥ, R.
Holmberg (DBC); Wagner Natural Area, 6 km W Edmonton, 12–25.vi.1985, pitfalls, 43, A. Finnamore, T. Thormin, T. Spanton (DBC); Waterton Lake National Park, 1584m, 27.vi–04.vii.2000, pitfalls in burned lodgepole pine, aspen forest, 43, E. Kinsella (DBC). Nova Scotia: Cape Breton Highlands National Park, Pleasant Bay, 06– 17.vi.1984, moist meadow, 432Ƥ, L. Masner (CNC). Ontario: Foxboro, 07.v.1962, river bank, 13, A. Turnbull (CNC); Gananoque, viii–x.1977, pitfalls in field, 1Ƥ, C. Dondale, J. Redner (CNC); Heasman Field, Chatterton, 26.v.1969, 1Ƥ (CNC); Lake Opeongo, Algonquin Provincial Park, 08–11. vii.1965, 2 Ƥ, R. Skinner (CNC); Oxford Mills, 01–05.vi.1973, pitfalls in river bank, 533Ƥ, J. Redner (CNC); Pelee Island, Lake Erie, 04–16.vi.1950, 131Ƥ, W. Ivie, T. Kurata (AMNH); Pinery Provincial Park, Burley Bridge, 17.v–14.vi.1988, pitfalls in swamp, 23, C. Dondale, J. Redner (CNC). Québec: Frelishburg, vi.1983, strawberry, 234Ƥ, C. Dondale, J. Redner (CNC). Saskatchewan: 10 km S Cadillac, 24-30. v.1995, 13, 30.v–01. vi.1995, 1 Ƥ, pitfalls in prairie, J. Pepper (DBC); 32km SE Beechy, 30.vi.1970, slough margin, 1Ƥ, R. Holmberg (DBC); 64km N Swift Current, 06.viii.1969, short grass prairie, 2Ƥ, P. Riegert (CNC); Cypress Hills, west side, 23.vi.1970, moist prairie around slough, 13, D. Buckle, R. Holmberg (DBC); Englefeld, vii.1966, 1 Ƥ, D. Buckle (DBC); Estevan, 28.vii.1965, 1Ƥ, J., W. Ivie (AMNH); Hanley, 09-30. v.1995, 13, 30.v–19. vi.1995, 13, 19.vi–05.vii.1995, 131Ƥ, pitfalls in prairie, K. Pivnick (DBC); Saskatoon, vi.1971, leaf litter, 13, 06 –1.vi.1972, pitfalls in poplar woods, 13, 18.viii.1982, yard, 1Ƥ, D. Buckle (DBC); St. Denis, 04–31. v.1995, 13, 31.v–21. vi.1995, 3 Ƥ, 04–24.vi.1996, 333Ƥ, 13.vii.1996, 1Ƥ, pitfall in native grassland, K. Pivnick (DBC). USA: Florida: Indiana River, 33, L. Marx (USNM); St. George Island, Potomar, 1Ƥ, L. Marx (USNM). Idaho: Castleford, Salmon Falls Creek, 12.iv.1932, 1Ƥ, R. Chamberlin (AMNH); NE Fruitland, 02.vii.1938, 231Ƥ, 20–30.viii.1940, 134Ƥ, 09.vii.1941, 337Ƥ, 01–10. vii.1942, 13, 25.xi.1942, 135Ƥ, 01.viii.1943, 10311Ƥ, 30.vii.1943, 134Ƥ, 10–25.ix.1943, 36341Ƥ, 24.xi.1943, 231Ƥ, 08–15.x.1944, 638Ƥ, 20.v.1944, 137Ƥ, 20.iv.1945, 6Ƥ, W. Ivie (AMNH); Notus, 18.ix.1993, 134Ƥ, W. Ivie (AMNH); Payette, 20.vi.1953, 232Ƥ, W. Ivie (AMNH). Illinois: Lenox, 15.iv.1993, under bark on ground, 1Ƥ, D. Lowrie (AMNH). Louisiana: St. Gabriel, Iberville Parish, 13.vii.1973, pitfall in bermuda grass, 1Ƥ, F. Howards (AMNH). Massachusetts: Woods Hole, 04.vii.1901, 1Ƥ, H. Britcher (AMNH). Maryland: Wells, 12.viii.1933, 2Ƥ, W. Ivie (AMNH). Michigan: Zoerman Farm, Holland, 02.vii.1987, 13, 25.vi.1987, 13, pitfall in old field, G. Price, R. Sliwinski (USNM); Zoerman Farm, Holland, 16.vi.1988, 13, 07.vii.1988, 13, pitfall in old field, M. Bell (USNM). Minnesota: Lauderdale, 23.v.1976, on lawn, 1Ƥ, B. Culter (AMNH); Lilydale, 16.vii.1980, sandstone cliff, 1Ƥ, M. Culter (USNM); Lutheran Seminary Grounds, 13.v.1967, 13, 17.v.1967, 13, under board, 02.v.1968, 13, B. Cutler (AMNH); Waseca Experimental Station, 23.vii.1952, on corn, 1Ƥ, M. Waters (AMNH); no specific locality, 15.vii.1903, 1Ƥ (USNM). New Jersey: Alpine, 09.v.1909, 13, von Krockow (AMNH); St. Piece Meadow, 03.v.1910, 13 (AMNH). New York: Armonk, 21.vii.1935, 13, H. Dietrich (AMNH); Ithaca, 1Ƥ (AMNH). North Carolina: Deep Creek near Bryson City, 08.vii.1983, 1Ƥ, W. Ivie (AMNH). North Dakota: 3.2km E Mohall, 28– 30.vii.1966, pitfalls, 13, R. Helgesen (DBC); Inkster, 01.v.1959, moss at spring, 13, R. Post (DBC); Thompson, 15.vii.1966, 13, R. Sauer (DBC); Bottineau Co., 28–30. vii.1966, 13, R. Sauer (DBC); Burke Co., 07–14. vii.1966, 13 (DBC); Divide Co., 07–14. vii.1966, 2 Ƥ (DBC); LaMoure Co., 04–12. vii.1966, 13 (DBC); Richland Co., 10.ix.1966. 1Ƥ, D. Aarhus (DBC); Towner Co., 8–15. vii.1966, 1 Ƥ, (DBC); Traill Co., 09–15. vii.1966, 1 Ƥ, (DBC); Williams Co., 07–14. vii.1966, 1 Ƥ, (DBC). Ohio: Gambier, viii.1905, 1 Ƥ, Dr. Nelson (AMNH). Pennsylvania: East of Jamison, Horseshoe Bend, Nashaminy Creek, 21–31. viii.1953, 13, v.1955, 4 Ƥ, vii.1955, 2 Ƥ, v.1956, 1 Ƥ, iii.1957, 13, 29.vi.1969, 538Ƥ (AMNH). Utah: Emery, 15.iv.1933, 23, W. ivie (AMNH); Moab, 09.v.1933, 236Ƥ, W. Ivie (AMNH); Moab, 18.vi.1934, 439Ƥ, W. Ivie, Rasmussen (AMNH); Ogden Canyon, 09.x.1937, 13, D. Hammond (AMNH); Salt Lake City, Jordan River, 04.v.1946, 232Ƥ, W. Ivie (AMNH). Virginia: Shenandoah National Park, Big Meadows, 14.vi.1982, sweeping meadow, 23, H. Goulet (CNC). Washington: Blue Lake, 02– 03.vi.1999, cottonwood leaf litter, 1Ƥ, R. Crawford (UWBM); Cedar Lake, 57km N Coiville, 10.vi.1961, 13, W. Ivie (AMNH). West Virginia: Glendale, 29.vi.1973, grassy hillside, 235Ƥ, J. Redner (CNC).
Distribution: Alaska to Newfoundland, south to Florida and northewestern USA.
description: 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 120-124, DOI: 10.11646/zootaxa.3674.1.1, http://zenodo.org/record/283954