Agyneta yukona, 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 : 50

Agyneta yukona new species

Figs 144–150 , map 6

Type material: Male holotype from Canada, Yukon Territory, km 465 Dempster Hwy., 4 July 1982, pan traps, D.M. Wood ( CNC). EXAMINED.

Etymology: The specific name is a noun in apposition taken from the type locality, Yukon Territory, Canada.

Diagnosis: Males are differentiated from all Agyneta species by their long, curved and narrow lamella characteristica with pointed tip, and broad anterior pocket of the paracymbium ( Fig. 144 ). From A. mollis by the presence of a ventral cymbial tubercle ( Fig. 145 ). Females are distinguished from all Agyneta by their straight, swiftly narrowing sides of the proximal part of scape ( Fig. 148 ). From A. mollis and A. simplex by their shallow pit hook depression ( Fig. 148 ), very shallow in A. mollis ( Fig. 155 ) and absent in A. simplex ( Fig. 162 )

Description: Male: Total length 1.77; carapace length 0.80, width 0.58.

CEPHALOTHORAX: Carapace light brown, shiny, finely reticulate; suffused with dark gray along margin, radiating lines. Sternum brown strongly suffused with dark gray. Clypeus height 2. Chelicerae orange-brown apical part lighter, excavated; ~ 12 seta-tipped tubercles; promargin two denticles, retromargin four denticles; without projections near base of fang. Cheliceral stridulatory organ ~39 striae, well spaced, getting slowly closer together basally. ABDOMEN: Uniformly gray. LEGS: Yellow; leg I total length: 2.62; leg III total length: 1.89; Tm I: 0.28, Tm IV: absent. GENITALIA: Palpal retrolateral tibial apophysis small, slightly rugose; dorsal tibial apophysis rounded and rugose; two retrolateral trichobothria and a dorsal one ( Fig.144 ). Cymbium triangular; glabrous depression present ( Fig. 144 ); dorsal cymbial tubercle rounded and smooth; ventral cymbial tubercle pointed and smooth; prolateral notch shallow ( Fig. 145 ). Paracymbium apical pocket short, anterior pocket curved and long forming a large cover, posterior pocket short and curved ( Fig. 144 ). Embolus tip pointed, straight; apically with bifid prong; basally with bifid flange and few small spines; Fickert’s gland absent; ventral lamella wide and rugose, broken in the middle; thumb reaching below the embolus proper ( Fig. 146 ). Embolus proper set apically, dorsal part narrower ( Fig. 146 ). Anterior terminal apophysis wide with short protrusions; posterior terminal apophysis wide, striated; lamella characteristica large, three spurs basally, ending in a sharp point ( Fig. 147 ).

Female: Total length 1.97; carapace length 0.67, width 0.55.

CEPHALOTHORAX: Same coloration as male. Chelicerae yellow; promargin four teeth, retromargin three denticles. Cheliceral stridulatory organ ~22 striae, well spaced. ABDOMEN: Same as male. LEGS: Same as male; palpal tibia and tarsus brownish, tarsal claw absent; leg I total length: 2.63; leg III total length: 1.99; Tm I: 0.27, Tm IV: absent. GENITALIA: Epigynum with proximal part of scape wide, basally straight, narrowing apically; epigynal slits very large and oval; pit hook depression shallow ( Fig. 148 ); lateral lobes long and wide; stertcher and pit small ( Fig. 149 ). Median part of scape long and wide; genital pores situated at base of lateral lobes pockets ( Fig. 150 ). Internal genitalia with elongated, obliquely oriented receptacula ventrally and a small rounded dorsal one ( Figs 149, 150 ).

Other material examined: CANADA: Yukon Territory: km 465 Dempster Hwy., 04.vii.1982, 23, 10– 22. vii.1982, 1 Ƥ, pan traps, D.Wood ( CNC).

Distribution: Northwest Canada.

Figures

FIGURES 144 – 150. Agyneta yukona n. sp. 144 – 147, Male. 148 – 150, Female. 144. Palp, retrolateral view. 145. Palp, prolateral view. 146. Embolus, prolateral view. 147. Radical division, retrolateral view. 148. Epigynum, ventral view. 149. Internal genitalia, ventral view. 150. Internal genitalia, dorsal view.

FIGURES 151 – 157. Agyneta mollis (O. Pickard-Cambridge 1871). 151 – 154, Male. 155 – 157, Female. 151. Palp, retrolateral view. 152. Palp, prolateral view. 153. Embolus, prolateral view. 154. Radical division, retrolateral view. 155. Epigynum, ventral view. 156. Internal genitalia, ventral view. 157. Internal genitalia, dorsal view.

FIGURES 158 – 164. Agyneta simplex (Emerton 1926). 158 – 161, Male. 162 – 164, Female. 158. Palp, retrolateral view. 159. Palp, prolateral view. 160. Embolus, prolateral view. 161. Radical division, retrolateral view. 162. Epigynum, ventral view. 163. Internal genitalia, ventral view. 164. Internal genitalia, dorsal view.