Agyneta unimaculata ( Banks 1892 )

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, Zootaxa 3674 (1), pp. 1-189 : 100-102

Agyneta unimaculata ( Banks 1892)

Figs 309–315 , map 22

Bathyphantes unimaculata Banks 1892: 45 , pl. 2, f. 65. (Description Ƥ).

Meioneta unimaculata Chamberlin & Ivie 1944: 91 . (Transferred Ƥ from Bathyphantes ). Agyneta unimaculata Buckle et al. 2001: 101 . (Transferred from Meioneta ).

Type material: Bathyphantes unimaculata Banks 1892 , 3 HOLOTYPE from New York, Ithaca. (unique number 23406). MCZ, EXAMINED. One male, one female and 2 juveniles in vial.

Diagnosis: Males are diagnosed from all other Agyneta species by their inverse S-shaped lamella characteristica and their dorsal tibial apophysis with row of spurs ( Fig. 309 ). From A. parva by the presence of dorsal and ventral cymbial tubercles ( Fig. 310 ), only dorsal cymbial tubercle present in A. parva ( Fig. 291 ). Females are diagnosed from all species by their extremely narrow, curved epigynal slits ( Fig. 313 ). To distinguish from A. parva and A. evadens see their diagnosis.

Description: Male: Total length 1.93; carapace length 0.85, width 0.61.

CEPHALOTHORAX: Carapace yellow-brown, shiny, finely reticulate; lightly suffused with gray along radiating lines and pars cephalica. Sternum suffused with gray. Clypeus height 3. Chelicerae apical half yellow, basal half suffused with dark gray; not excavated; seta-tipped tubercles absent; promargin five denticles, retromargin four tiny denticles. Cheliceral stridulatory organ easily visible ~17 striae, widely spaced. ABDOMEN: Uniformly light to dark gray. LEGS: Light yellow, base of femur slightly suffused with dark gray; leg I total length: 2.98; leg III total length: 2.11; Tm I: 0.22, Tm IV: absent. GENITALIA: Palpal retrolateral tibial apophysis long and pointed; dorsal tibial apophysis curved with 4–5 pointed spurs; two retrolateral trichobothria and one dorsal ( Fig. 309 ). Cymbium triangular; glabrous depression present ( Fig 309 ); dorsal cymbial tubercle smooth; ventral cymbial tubercle rugose; prolateral notch shallow ( Fig 310 ). Paracymbium apical pocket medium, anterior pocket long, posterior pocket absent ( Fig. 309 ). Embolus tip narrow with small prong; one large spikes basally; numerous small spines ventrally; Fickert’s gland absent; ventral lamella reduced or absent; thumb reaching the embolus proper ( Fig. 311 ). Embolus proper set apically on a vertical ridge, of equal part ( Fig. 311 ). Anterior terminal apophysis wide with numerous, curved protrusions; posterior terminal apophysis narrow, tip curved fused to a wide lamella characteristica with one large prong ( Fig. 312 ).

MAP. 22. Localities of Agyneta unimaculata ( Banks 1892) , distribution based on material examined, distribution based on Paquin et al. 2010, Agyneta chiricahua n. sp.

Female: Total length 1.83; carapace length 0.74, width 0.58.

CEPHALOTHORAX: Colorations as male. Clypeus height 3. Chelicerae promargin four denticles, retromargin three tiny denticles. Cheliceral stridulatory organ easily visible ~10 striae, well spaced. ABDOMEN: Coloration as male. LEGS: Coloration as male; palpal tarsal claw absent, palpal segments, strongly suffused with dark gray; leg I total length: 2.72; leg III total length: 2.03; Tm I: 0.25, Tm IV: absent. GENITALIA: Epigynum with wide proximal part of scape, slightly enlarging into a oval plate; epigynal slits extremely narrow and curved; pit hook depression indistinguishable ( Fig. 313 ); lateral lobes very long with constriction ( Fig. 313 ); stretcher medium; pit deep ( Fig. 314 ). Median part of scape long and narrow; genital pores situated at base of lateral lobes pockets ( Fig. 315 ). Internal genitalia with elongated ventral receptacula and small rounded dorsal one, vertically positioned ( Figs 314, 315 ).

Other material examined: CANADA: New Brunswick: Kouchibouguac, 17.vi.1977, under eel grass, 6Ƥ, J. Redner ( CNC). Nova Scotia: Woodville, 25.vii.1955, apple orchard, 233Ƥ, C. Dondale ( CNC). Ontario: Grassie, 12.vii.1965, 2Ƥ, J., W. Ivie ( AMNH); Mer Bleue, E of Ottawa, 19.vii–11.viii.1972, 231Ƥ, pitfalls in meadow, 01.ix.1972, sweeping, 23, 09.vi–03.vii.1975, sphagnum bog, 33, C. Dondale, J. Redner ( CNC); New Liskeard, 0 1–13.viii.1973, in grass edge of hayfield, 233Ƥ, C. Starr ( CNC); Ottawa, 01.viii–23.viii.1978, pitfalls in backyard, 931Ƥ, L. Masner ( CNC); Toronto, Grenadier Pond, 01.ix.1946, 131Ƥ, W. Ivie ( AMNH). Québec: Frelighsburg, 09.vii.1984, strawberry field, 332Ƥ ( CNC); Rigaud, near Ottawa River, 03.vi.1988, flood palin vegetation, 7Ƥ, L. Lesage ( CNC). Saskatchewan: 05–08.vii.1996, pitfalls in crested wheatgrass, 13, A. Finnamore ( DBC). USA: Illinois: 3.2km N Plano, 03.v.1942, mixed hickory-oak woods, 1Ƥ, D. Lowrie ( AMNH); 8km NE LaPrairie, 01.vii.1939, 1Ƥ, D. Lowrie ( AMNH). Indiana: 16km E Angola, 02.viii.1964, 134Ƥ, J., W. Ivie ( AMNH). Kentucky: Quicksand, 25.vi.1925, 13, C. Crosby, Bishop ( AMNH). Maryland: Patuxtent Wildlife Research Center, 25.viii.1993, 1Ƥ, G. Hormiga ( USNM); Plesant Hill, 11–19. vii.1989, 1 Ƥ, W. Steiner, J. Swearingen ( USNM); Sheppard Pratt, pond area, 17.vii.1974, 13, A. Scarbtough (JCC). Michigan: Zoerman Farm, Holland, 18.vi.1987, 531Ƥ, 02.vii.1987, 131Ƥ, 09.vii.1987, 532Ƥ, 21.vii.1987, 23, pitfalls in old field, G. Price, R. Sliwinski ( USNM); Zoerman Farm, Holland, 16.vi.1988, 23, 07.vii.1988, 23, 14.vii.1988, 23, 28.vii.1988, 23, 04.viii.1988, 23, old field, M. Bell ( USNM). Minnesota: Minneapolis University, 21.vi.1982, 1Ƥ, E. Bank, B. Cutler ( USNM). Missouri: Columbia: 22.xi.1904, 131Ƥ, vii.1905, 23, C. Crosby ( AMNH); Tucker Prairie, 14.viii.1984, 13, J. Weaver ( AMNH); Warrensburg, 03.xii.1961, 13, 02.vi.1963, 1Ƥ, W. Peck ( CAS); Warrensburg, 02.vi.1965, 2Ƥ, H.E.F. ( CAS). Nebraska: Crete, 07.xii.1982, 23, W. Rapp ( AMNH); Garland, 21.ii.1987, 1Ƥ, J., W. Rapp ( AMNH). New Jersey: Lambertville, viii.1951, 13, W. Ivie ( AMNH). New York: Weedsport, 2Ƥ, R. Chamberlin ( AMNH). North Dakota: Northwood, 05.vi.1959, 13, R. Post ( DBC); Bottineau Co., 0 8–14. vii.1966, 1 Ƥ( DBC); Cass Co., 09–15. vii.1966, 1 Ƥ ( DBC); Grand Forks Co., 09–15.vii.1966, 233Ƥ ( DBC); Walsh Co., 0 8–15. vii.1966, 1 Ƥ ( DBC). Pennsylvania: East of Jamison, Horseshoe Bend, Nashaminy Creek, 08.vi.1953, 131Ƥ, vii.1953, 13, 21–31.viii.1953, 4321Ƥ, 28.ix.1953, 333Ƥ, x.1953, 133Ƥ, 23.x.1953, 533Ƥ, iv.1954 – vi.1954, 335Ƥ, x.1954, 237Ƥ, 14.x.1954, 43333Ƥ, v.1955 – vii.1955, 2 Ƥ, vi.1956 - viii.1956, 2 Ƥ, viii.1957, 13, 22.vii.1962, 2Ƥ, 16.v.1964, 13, 21.vi.1964, 134Ƥ, ix.1965, 13, 29.vi.1969, 133Ƥ, 05.vii.1969, 4310Ƥ, W. Ivie ( AMNH); West Alexander, 07.vii.1966, 131Ƥ, roadside, J., W. Ivie ( AMNH). Virginia: East Falls Church, 30.vi.1926, 13, C. Crosby ( AMNH); Marrn, 06.vii.1933, 135Ƥ ( AMNH); Steeles Tavern, 14.viii.1962, 1Ƥ, sweep pasture, A. Woodside ( AMNH).

Distribution: Northeastern North America, west to Saskatchewan.

Figures

FIGURES 309 – 315. Agyneta unimaculata (Banks 1892). 309 – 312, Male. 313 – 315, Female. 309. Palp, retrolateral view. 310. Palp, prolateral view. 311. Embolus, prolateral view. 312. Radical division, retrolateral view. 313. Epigynum, ventral view. 314. Internal genitalia, ventral view. 315. Internal genitalia, dorsal view.

FIGURES 290 – 299. Agyneta parva (Banks 1896). 290 – 294, Male. 295 – 299, Female. 290. Palp, retrolateral view. 291. Palp, prolateral view. 292. Embolus, prolateral view. 293. Radical division, retrolateral view. 294. 295. Abdomen, dorsal view. 296. Epigynum, ventral view. 297. Internal genitalia, ventral view. 298. Internal genitalia, dorsal view. 299. Internal genitalia, lateral view.