Agyneta grandcanyon, Dupérré, Nadine, 2013

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 : 105-107

Agyneta grandcanyon new species

Figs 326–335 , map 23

Type material: Male holotype and female allotype from Arizona, Grand Canyon, Colorado River-side, mile 169, Oct. 27, 1982, V. Roth ( AMNH). EXAMINED.

Etymology: The specific name is a noun in apposition taken from the type locality Grand Canyon National Park, USA.

Diagnosis: Males and females are diagnosed by their abdominal patterns ( Figs 330, 331 ). Males are distinguished by their unique small, pointed dorsal cymbial tubercle ( Fig. 327 ) and their elongated retrolateral tibial apophysis ( Fig. 326 ). Female are differentiated from all other Agyneta by their uniquely long and narrow proximal part of scape ( Fig. 332 ).

Description: Male: Total length 1.64; carapace length 0.78, width 0.64.

MAP. 23. Localities of Agyneta barrowsi ( Chamberlin & Ivie 1944) , Agyneta grandcanyon n. sp.

CEPHALOTHORAX: Carapace light yellow-orange, shiny, finely reticulate; suffused with gray along radiating lines. Sternum suffused lightly with gray, darker along margin, reaching all the way between coxae four to the pedicel. Cypeus low (2x AME). Chelicerae light yellow; not excavated, seta-tipped tubercles absent; promargin three denticles, retromargin three tiny denticles. Cheliceral stridulatory organ ~14 striae, well spaced throughout. ABDOMEN: Off-white with dark median band and transverse bands on posterior half or dark median band broken, with a large arrow-shaped mark ( Fig. 330 ) or else same as female, off-white with basal, lateral dark marks ( Fig. 331 ).

LEGS: Light yellow; leg I total length: 3.61; leg III total length: 2.37; Tm I: 0.23, Tm IV: absent. GENITALIA: Palpal retrolateral tibial apophysis long, smooth and narrow; dorsal tibial apophysis with curved, pointed tip; two retrolateral trichobothria and one dorsal ( Fig. 326 ). Cymbium triangular; glabrous depression present ( Fig 326 ); dorsal cymbial tubercle small, smooth and pointed; ventral tubercle large and smooth; prolateral notch shallow ( Fig. 327 ). Paracymbium apical pocket short, anterior pocket short, posterior pocket absent ( Fig. 326 ). Embolus tip wide, rounded with long prong; ventrally rugose; basally with one large spike; Fickert’s gland absent; ventral lamella absent; thumb reaching the embolus proper ( Fig. 328 ). Embolus proper set apically on a vertical ridge, of equal part ( Fig. 326 ). Anterior terminal apophysis large with numerous, long protrusions and extra bifid apophysis basally; posterior terminal apophysis long, basally with large tooth-like extension with numerous small spines; lamella characteristica elongated with pointed tip ( Fig. 329 ).

Female: Total length 1.88; carapace length 0.68, width 0.58.

CEPHALOTHORAX: Coloration as in male. Chelicerae light yellow; promargin four denticles, retromargin two tiny denticles. Clypeus height 2. Cheliceral stridulatory organ visible ~10 striae, well spaced. ABDOMEN: Off-white with median dark band and dark transverse band or off-white with small, dark latero-basal marks ( Fig. 331 ). LEGS: Same as male; palpal tarsal claw absent; leg I total length: 3.90; leg III total length: 2.71; Tm I: 0.24; Tm IV: absent. GENITALIA: Epigynum with long and narrow proximal part of scape, slightly narrowing apically; epigynal slits large; pit hook depression absent ( Fig. 332 ); lateral lobes very long; stretcher long; pit deep ( Fig. 335 ). Median part of scape long, narrow and parallel; genital pores located at the base of the lateral lobes ( Fig. 334 ). Internal genitalia with rounded ventral receptacula, dorsal receptacula elongated ( Figs 333, 334 ).

Other material examined: USA: Arizona: 16km E Sierra Vista, San Pedro River, 09.iv.1973, 1Ƥ ( AMNH); 45km E Douglas, Guadalupe Canyon, 11.vi.1968, 1Ƥ, 13.vii.1972, 437Ƥ, 16.viii.1983, 131Ƥ, V. Roth ( CAS); Chiricahua Mountains, Stewart Campground, 12.viii.1981, riparian under rocks, 133Ƥ, D. Ubick ( DUC); Chiricahua Mountains, Southwestern Research Station, 1645m, 16.xi.1964, 1Ƥ, 08.xi.1965, 1Ƥ, V. Roth ( DUC); Chiricahua Mountains, Southwestern Research Station, 1645m, 31.viii.1970, 1Ƥ, 01–15. iii.1972, 13, V.R o t h ( CAS); Chiricahua Mountains, Southwestern Research Station, 1645m, 15.iii.1965, 131Ƥ, 04.iv.1966, 1Ƥ, V.Roth ( AMNH); Chiricahua Mountains, Southwestern Research Station, 1676m, 25.vii.1996, riparian forest, 333Ƥ, D. Ubick ( DUC); Chiricahua Mountains, Southwestern Research Station, 1645m, 12.ix.1971, pitfall, 23, A. Jong ( CAS); Chiricahua Mountains, Southwestern Research Station, 8km W Portal, 1645m, 09.vii.1963, 1Ƥ, V. Roth ( AMNH); Grand Canyon, Colorado, mile 169, 17.x.1982, Tamarix duff, river side, 43, V. Roth ( AMNH); Grand Canyon, Colorado, mile 48, 18.x.1982, Tamarix duff, river side, 133Ƥ, V. Roth ( CAS); Monument Valley, 23 ( AMNH); Patagonia, 29.xii.1940, 434Ƥ, D., S. Mulaik ( AMNH); Phoenix, 02.iv.1938, 13 ( AMNH); South Mountain View, 09.ix.1941, 131Ƥ, W. Ivie ( AMNH); South Fork, 6.4km W Portal, 09.viii.1965, 1Ƥ, W. Gertsch ( AMNH); Virgin Narrows, 8km E Littlefield, 11.vi.1934, 131Ƥ, W. Ivie, H. Rasmussen ( AMNH); Virgin Narrows, near Littlefield, 19.iv.1932, 5Ƥ, W. Ivie ( AMNH). California: 11km W El Centro, 14.iii.1941, 1Ƥ, W. Ivie ( AMNH); Cow Creek Canyon, Funeral Mountains, 25.iv.1955, 1Ƥ, R. Schick ( AMNH); Fort Yuma, 131Ƥ ( AMNH); Palm Canyon, Palm Springs, 27.iii.1960, 131Ƥ, W. Gertsch, W. Ivie ( AMNH). Nevada: Muddy River, 22km SE of Moapa, 10.vi.1934, 331Ƥ, W. Ivie, H. Rasmussen ( AMNH). Utah: Bluff, 11.v.1933, 43, 12.v.1933, 43, W. Ivie ( AMNH); Zion National Park, 09.vi.1927, 131Ƥ, R. Chamberlin ( AMNH); Zion National Park, viii.1937, 1 Ƥ ( AMNH).

Distribution: Southwest USA.

Figures

FIGURES 326 – 335. Agyneta grandcanyon n. sp. 326 – 330, Male. 331 – 335, Female 326. Palp, retrolateral view. 327. Palp, prolateral view. 328. Embolus, prolateral view. 329. Radical division, retrolateral view (arrow points to bifid apophysis). 330. 331. Abdomen, dorsal view. 332. Epigynum, ventral view. 333. Internal genitalia, ventral view. 334. Internal genitalia, dorsal view. 335. Internal genitalia, lateral view.