Agyneta barrowsi ( Chamberlin & Ivie 1944 )

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 : 111-112

Agyneta barrowsi ( Chamberlin & Ivie 1944)

Figs 354–360 , map 23

Meioneta barrowsi Chamberlin & Ivie 1944: 83 , f. 153–154. (Description Ƥ). Agyneta barrowsi Buckle et al. 2001: 100 . (Transferred from Meioneta ).

Type material: Meioneta barrowsi Chamberlin & Ivie 1944 , 3 HOLOTYPE, Ƥ ALLOTYPE from Georgia: Demorest, W 83º 32’: N 34º 33’, April 26, 1943, Wilton Ivie collector ( AMNH). EXAMINED.

Diagnosis: Males are diagnosed from all Agyneta by their smooth, leaf-shaped lamella characteristica ( Fig. 354 ). Females are diagnosed from all species by their long and narrow epigynal slits almost reaching the anterior part of the epigynum ( Fig. 358 ). From A. unimaculata by the S-shaped receptaculum of the internal genitalia ( Fig. 359 ), elongated and straight in the latter ( Fig. 314 ).

Description: Male: Total length 1.72; carapace length 0.82, width 0.62.

CEPHALOTHORAX: Carapace light orange-brown, shiny, finely reticulate; lightly suffused with gray along margin, radiating lines; sometimes with trident mark. Sternum suffused with dark gray. Clypeus height 2. Chelicerae light orange-brown apical part lighter; excavated, ~ 13 seta-tipped tubercles; promargin five denticles, retromargin four tiny denticles. Cheliceral stridulatory organ easily visible ~64 striae, narrowly spaced throughout. ABDOMEN: Uniformly light to dark gray. LEGS: Light yellow, basal part of femur darker; leg I total length: 3.17; leg III total length: 2.11; Tm I: 0.21, Tm IV: absent. GENITALIA: Palpal retrolateral tibial apophysis long, smooth; dorsal tibial apophysis wide, smooth; two retrolateral trichobothria and one dorsal ( Fig. 354 ). Cymbium triangular; glabrous depression present ( Fig. 354 ); dorsal cymbial tubercle triangular, rugose; ventral cymbial tubercle small, smooth; prolateral notch shallow ( Fig. 355 ). Paracymbium apical pocket short, anterior pocket long making a large cover, posterior pocket absent ( Fig. 356 ). Embolus tip wide and pointed with wide and dentate prong; ventrally rugose; basally with one spur (sometimes missing); Fickert’s gland absent; ventral lamella transparent, serrated; thumb reaching embolus proper ( Fig. 356 ). Embolus proper set apically, small ( Fig. 356 ). Anterior terminal apophysis wide with numerous long and short protrusions; posterior terminal apophysis with pointed tip, with one large spur and two small spikes basally ( Fig. 357 arrow); lamella characteristica wide, well sclerotized with rounded, serrated tip ( Fig. 357 ).

Female: Total length 1.57; carapace length 0.62, width 0.47.

CEPHALOTHORAX: Coloration same as male. Clypeus height 2. Chelicerae light yellow-brown; promargin six teeth, retromargin five denticles. Cheliceral stridulatory organ visible ~57 striae, narrowly spaced. ABDOMEN: Same as male. LEGS: Same as male; palpal dark yellow-brown, tarsal claw absent; leg I total length: 2.48; leg III total length: 1.83; Tm I: 0.26, Tm IV: absent. GENITALIA: Epigynum with wide, rounded proximal part of scape; epigynal slits long and narrow; pit hook depression absent ( Fig. 358 ); lateral lobes very long; stretcher and pit medium ( Fig. 359 ). Median part of scape long and narrow; genital pores situated at base of lateral lobes pockets ( Fig. 360 ). Internal genitalia with elongated, sinuous ventral receptacula and small oval dorsal one ( Figs 359, 360 ).

Other material examined: CANADA: Ontario: Hamilton, 1957, 13, B. Poole ( CNC); shore of Mazinaw Lake near Cloyne, highway 41, 18–25. vii.1964, 1 Ƥ, A. Turnbull ( CNC). Nova Scotia: Bridgewater, 0 1– 16.vii.1965, pitfall in oak stand, 73, B. Wright ( CNC); Bridgewater, 13.vii.1966, 53, 16.viii.1966, 13, pitfall in oak stand, D. Embree ( CNC). USA: Arkansas: Cove Creek, 10.iii.1061, pitfall in leaf litter in woods, 1Ƥ, ( CAS); Jonesboro, 12.i.1967, 13, 19.i.1967, 1Ƥ, oak-hickory woods, Hite ( CAS); Sumpter, iv-v.1964, 131Ƥ, Leslie ( CAS); Sumpter, Pow-19, 08.vi.1962, 13, Leslie ( CAS); Sumpter, Pow-58, 27.viii.1963, pine-oak woods, 131Ƥ, Leslie ( CAS); Sumpter, Pow-165, 29.iii.1964, pine-oak woods, 1Ƥ, Leslie ( CAS); Trafford, 27.vi.1963, 1Ƥ ( CAS); no specific locality, 13.iv.1967, 1233Ƥ, Hite ( CAS). Florida: 4.8km NW Maitland, 10.xii.1962, 13, W. Ivie ( AMNH). Georgia: Demorest, 26.iv.1943, 4Ƥ ( AMNH); NE Lula, 26.iv.1943, 2Ƥ ( AMNH); Tallulah Falls, 28.iv.1943, 23 ( AMNH). Louisiana: Hamburg, 03.v.1963, 1Ƥ ( AMNH). Maryland: Patuxtent Wildlife Research Center, 11.v.1994, 1Ƥ, 16.v.1994, 2Ƥ, G. Hormiga ( USNM). Michigan: 3.2km NE Fennville, 28.vii.1987, oak forest, 1Ƥ, W. Bosworth ( USNM); 4.8km NE Fennville, 02.vii.1987, pitfall in old forest, 13, G. Price, R. Sliwinski ( USNM); Rolla, 20.vi.1962, 13, H.E.F. ( CAS); St. Charles, 1927, 1Ƥ, M. Brown ( AMNH). Mississippi: NE Hattlesburg, 27.vii.1940, 13, D., S. Mulaik ( AMNH). North Carolina: Greensboro, 15.vi.1949, leaf mold, 1Ƥ, D. Wray ( AMNH). Nebraska: Lincoln, 1941, 13, M. Harbaugh ( AMNH). New Jersey: Bass River State Forest, 10.v.1964, 134Ƥ, J., W. Ivie ( AMNH). Tennessee: Smoky Mountain National Park, Chestnut Top Trail, 29.viii.1978, under rock, 1Ƥ, V. McNellus ( TMM); UT Woodlot, west post, 10.vii.1975, oak-hickory, 13 ( TMM).

Virginia: Chancellorsville, 08.viii.1968, 2Ƥ, C. Alteri ( AMNH). West Virginia: 16km SE Parkersurgh, 14.v.1967, 3Ƥ, B. Vogel ( AMNH).

Distribution: Eastern North America, west to Nebraska.

Figures

FIGURES 354 – 360. Agyneta barrowsi (Chamberlin & Ivie 1944). 354 – 357, Male. 358 – 360, Female. 354. Palp, retrolateral view. 355. Palp, prolateral view. 356. Embolus, prolateral view. 357. Radical division, retrolateral view (arrow points to spur and spikes of the posterior terminal apophysis). 358. Epigynum, ventral view. 359. Internal genitalia, ventral view. 360. Internal genitalia, dorsal view.

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.