Agyneta crista, 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 : 113-115

Agyneta crista new species

Figs 361–367 , map 24

Type material: Male holotype from Utah, 6 miles north of Greenriver, W 110º10’, N 39º 5’, May 7, 1933, Wilton Ivie collector ( AMNH). EXAMINED.

Etymology: The specific name is a noun in apposition taken from the Latin meaning rooster-comb, in reference to the shape of the embolus prong.

Diagnosis: Males are diagnosed from all Agyneta by their distinctive, carinated dorsal cymbial tubercle and their extremely large ventral cymbial tubercle ( Fig. 362 ), from A. tuberculata by the elongated process of the posterior terminal apophysis ( Fig. 364 arrow), short in the latter ( Fig. 372 ). Females are diagnosed from all species by their narrow, triangular epigynal slits ( Fig. 365 ), from A. tuberculata by the anteriorly situated semicircular depressions on the surface of the epigynum ( Fig. 365 arrow).

Description: Male: Total length 1.98; carapace length 0.91, width 0.68.

MAP. 24. Localities of Agyneta crista n. sp., Agyneta catalina n. sp.

CEPHALOTHORAX: Carapace orange, shiny, finely reticulate; lightly suffused with gray along margin. Sternum suffused with dark gray. Clypeus height 2. Chelicerae light orange, excavated; ~ 25 seta-tipped tubercles present; promargin four denticles, retromargin two tiny denticles. Cheliceral stridulatory organ visible ~56 striae, narrowly spaced throughout. ABDOMEN: Uniformly light to dark gray. LEGS: Light yellow; leg I total length: 3.41; leg III total length: 2.35; Tm I: 0.26, Tm IV: absent. GENITALIA: Palpal retrolateral tibial apophysis long, tip recurved slightly serrated lip; dorsal tibial apophysis wide, smooth; two retrolateral trichobothria and one dorsal ( Fig. 361 ). Cymbium triangular; glabrous depression present ( Fig. 361 ); dorsal cymbial tubercle with rounded tip and carinated; ventral cymbial tubercle long, smooth with rounded tip; prolateral notch shallow ( Fig. 362 ). Paracymbium apical pocket medium, anterior pocket long making a large cover, posterior pocket absent ( Fig. 361 ). Embolus tip wide and pointed, with wide and dentate prong; ventrally rugose; Fickert’s gland absent; ventral lamella transparent, spiny; thumb reaching embolus proper ( Fig. 363 ). Embolus proper set apically, dorsal part slightly larger ( Fig. 363 ). Anterior terminal apophysis very wide with numerous protrusions; posterior terminal apophysis with narrow pointed tip and one spur-like process basally ( Fig. 364 arrow); lamella characteristica wide, well sclerotized with pointed tip ( Fig. 364 ).

Female: Total length 1.74; carapace length 0.75, width 0.57.

CEPHALOTHORAX: Coloration as male. Clypeus height 2. Chelicerae orange, promargin five teeth, retromargin five denticles. Cheliceral stridulatory organ visible ~52 striae, narrowly spaced throughout. ABDOMEN: Same as male. LEGS: Same as in male; palpal segment slightly suffused with gray, tarsal claw absent; leg I total length: 2.87; leg III total length: 2.03; Tm I: 0.29, Tm IV: absent. GENITALIA: Epigynum with wide proximal part of scape, slightly enlarging; epigynal slits narrow and triangular; pit hook depression indistinguishable ( Fig. 365 ); lateral lobes short; stretcher short; pit deep ( Fig. 366 ). Median part of scape long and narrow, wrinkled; genital pores situated at lateral lobes pockets ( Fig. 367 ). Internal genitalia with large pear-shaped receptacula ( Figs 366, 367 ).

Other material examined: USA: Arizona: Chiricahua Mountains, Southwestern Research Station, 1645m, 10.vii.1963, 13, 03.iii.1969, under rocks in stream bed, 13, V. Roth ( AMNH); Douglas, 20.ix.1968, 13, V. Roth ( AMNH). Oklahoma: Enid, 25.ix.1989, ballooning, 13, 07.vi.1991, 13, L. Anhorn ( USNM). Texas: Bill Haney Pecan Orchard, FM 1476, 3.2km E US 377/67, 0 2–09. v.2001, 13, 25.v–01.vi.2001, 731Ƥ, 08–15.vi.2001, 43, pitfall in pecan orchard, A. Calixto ( TAMU); Comfort, 08.vii.1936, 13, L. Davis ( AMNH); Mumford, Holmes Pecan Orchard, 0 9–17.viii.2001, 232Ƥ, pitfall in pecan orchard, A. Calixto ( TAMU); near Stillwater, vi–ix.1966, Sorghum field, 1036Ƥ, C. Bailey ( CAS); Patagonia, 29.xii.1940, 234Ƥ, D., S. Mulaik ( AMNH). Utah: Dry Canyon, Salt Lake City, 15.x.1932, 23, W. Ivie ( AMNH); Little Castle Valley near Carleton, 3.x.1931, under rocks, 334Ƥ, W. Ivie ( AMNH); Moab, 25.x.1931, 432Ƥ, W. Ivie ( AMNH); St. George, 12.vi.1934, 13, W. Ivie ( AMNH).

Distribution: Southwestern USA.

Figures

FIGURES 361 – 367. Agyneta crista n. sp. 361 – 364, Male. 365 – 367, Female. 361. Palp, retrolateral view. 362. Palp, prolateral view. 363. Embolus, prolateral view. 364. Radical division, retrolateral view (arrow points to spur-like process). 365. Epigynum, ventral view (arrow points to semicircular depression). 366. Internal genitalia, ventral view. 367. Internal genitalia, dorsal view.

FIGURES 368 – 375. Agyneta tuberculata n. sp. 368 – 372, Male. 373 – 375, Female. 368. Palp, retrolateral view. 369. Palp, prolateral view. 370. Variation of dorsal and ventral cymbial tubercles, prolateral view (arrow points to ventral cymbial protuberance). 371. Embolus, prolateral view. 372. Radical division, retrolateral view (arrow points to basal spur). 373. Epigynum, ventral view. 374. Internal genitalia, ventral view. 375. Internal genitalia, dorsal view.