Agyneta issaqueena, 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 : 168-169

Agyneta issaqueena new species

Figs 557–561 , map 37

Type material: Male holotype from South Carolina, Pickens County, Wildeat Creek picnic area near Lake Issaqueena , 700’ elev., 34º 45.53N, 82º 52.24W, 18 July 1998, I. Agnarsson ( USNM). EXAMINED.

Etymology: The specific name is a noun in apposition taken from the type locality, Lake Issaqueena , South Carolina, USA.

Diagnosis: Male are easily diagnosed from all Agyneta by their elongated, cylindrical abdomen ( Fig. 561 ) and the presence of a large basal protuberance of the palpal tibia ( Fig. 557 arrow).

Description: Male: Total length 1.74; carapace length 0.78, width 0.53.

CEPHALOTHORAX: Carapace light orange-brown, shiny, finely reticulate; suffused with dark gray along margin, radiating lines; trident mark present. Sternum orange-brown suffused with dark gray. Clypeus height 2. Chelicerae light yellow-orange, excavated; ~ 10 seta-tipped tubercles; promargin four teeth, retromargin three denticles, promargin without, retromargin with rounded projection near base of fang. Cheliceral stridulatory organ ~49 striae, narrowly spaced throughout. ABDOMEN: Cylindrical, light gray apically, basally darker ( Fig. 561 ). LEGS: Yellow, basal part of femurs I-IV and distal half of tibia I dark gray; leg I total length: 2.33; leg III total length: 1.65; Tm I: 0.22, Tm IV: absent. GENITALIA: Retrolateral tibial apophysis pointed, with a round rugose bulge; dorsal tibial apophysis absent; tibia bearing large protuberance dorso-basally; one retrolateral trichobothria and one dorsal ( Fig. 557 ). Cymbium pointed; glabrous depression present ( Fig. 557 ); dorsal cymbial tubercle sharply pointed; ventral tubercle pointed, both slightly rugose; prolateral notch absent ( Fig. 558 ). Paracymbium apical pocket short, anterior pocket short and strongly curved making a small cover, posterior pocket absent ( Fig. 557 ). Embolus tip rounded; basally with large flange and prong; Fickert’s gland situated basally, slightly enlarged; ventral lamella narrow, pointed and serrated; thumb short, reaching well below the embolus proper ( Fig. 559 ). Embolus proper set apically on a vertical ridge with large associated prong, dorsal part larger ( Fig. 559 ) Anterior terminal apophysis narrow, tip with no protrusions; posterior terminal apophysis small, curved, excavated; lamella characteristica large, rugose ending in a sharp hook-shaped prong ( Fig. 560 ).

Female: Unknown.

Other material examined: USA: Tennessee: Catoosa Wildlife Management Area, half way between Catoosa and Daddy’s creek, 9.viii. 19811, near road, flat rocks in xeric habitat near woods, 13, L. Sorkin ( AMNH).

Distribution: Southeastern USA.

Figures

FIGURES 557 – 561. Agyneta issaqueena n. sp. 557 – 561, Male. 557. Palp, retrolateral view (arrow points to basal protuberance). 558. Palp, prolateral view. 559. Embolus, prolateral view. 560. Radical division, retrolateral view. 561. Abdomen, dorsal view.