Agyneta crawfordi, 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 : 72

Agyneta crawfordi new species

Figs 209–212 , map 12

Type material: Male holotype taken at Milk Canyon, 46.855ºN 120.819ºW, Yakima County, Washington, 09- 11.xi.1996, sifting litter, Y. Marusik ( UWBM). EXAMINED.

Etymology: The specific name is a patronym in honor of Mr. Rodney Crawford, curator at the Burke Museum in Washington.

Diagnosis: Male are diagnosed from all other species in the genus by their large, rounded dorsal cymbial tubercle associated with small ventral cymbial tubercle ( Fig. 210 ), from members of the species group by their long rugose posterior pocket of the paracymbium ( Fig. 209 ).

Description: Male: Total length 1.42; carapace length 0.64, width 0.53.

CEPHALOTHORAX: Carapace light yellow, shiny, finely reticulate; lightly suffused with light gray along radiating lines and margin. Sternum lightly suffused with gray. Clypeus height 2. Chelicerae light yellow, not excavated; seta-tipped tubercles absent; promargin three denticles, retromargin two tiny denticles. Cheliceral stridulatory organ easily visible ~19 striae, well spaced. ABDOMEN: Uniformly light gray. LEGS: Light yellow; leg I total length: 2.45; leg III total length: 1.78; Tm I: 0.30, Tm IV: absent. GENITALIA: Palpal retrolateral tibial apophysis small, triangular; dorsal tibial apophysis triangular, rugose; one retrolateral and one dorsal trichobothria ( Fig. 209 ). Cymbium with retrolateral fold; glabrous depression present ( Fig. 209 ); dorsal cymbial tubercle large and rugose; ventral tubercle small and smooth; prolateral notch shallow ( Fig. 210 ). Paracymbium apical pocket long, anterior pocket absent, posterior pocket long and rugose ( Fig. 209 ). Embolus tip pointed; retro-ventrally with a row of well-sclerotized and transparent spines; Fickert’s gland medial, bulbous; ventral lamella enlarged into a basal plate with a few short spines, extending on the retrolateral side of the embolus all the way to the embolus proper, with no obvious spines; thumb short, reaching the base of the embolus proper ( Fig. 211 ). Embolus proper set apically with long dorsal part, serrated, reaching the tip of embolus ( Fig. 211 ). Anterior terminal apophysis long with a few curved protrusions; posterior terminal apophysis with one rounded, one pointed tip and two spines basally; lamella characteristica long, with bifid spiny tip ( Fig. 212 ).

Female: Unknown.

Other material examined: One male paratype collected with holotype.

Distribution: Northwest USA.

The vinki group includes three species, A. vinki n. sp., A. miniata n. sp. and A. panthera n. sp. This group of very closely related species occurs in western North America.

All members of the group share a unique characteristic, the embolus proper is set on a horizontal ridge reaching the tip of the embolus, retro-basally in correlation with a projection ( Fig. 215 arrow). The group is characterized by males and females displaying similar abdominal patterns ( Figs 217, 218 , 227, 228 , 237 ). Furthermore, the male chelicerae are large, excavated with seta-tipped tubercles and promarginal-retromarginal projections ( Fig. 26 ). Palpal tibia with two retrolateral trichobothria and a dorsal one; paracymbium with long apical pocket, anterior pocket and posterior pocket curved ( Figs 213 , 223 , 233 ). The ventral lamella is highly reduced; the thumb reaches a little over the embolus proper and no Fickert’s glands have been observed ( Figs 215 , 225 , 235 ). The female genital pores are located in the lateral lobes, not at the lateral lobe pockets ( Figs 220 , 230 ) and the lateral lobes are elongated and folded basally ( Fig. 222 , arrow).

Figures

FIGURES 209 – 212. Agyneta crawfordi n. sp. 209 – 212, Male. 209. Palp, retrolateral view. 210. Palp, prolateral view. 211. Embolus, prolateral view. 212. Radical division, retrolateral view.

FIGURES 213 – 222. Agyneta vinki n. sp. 213 – 217, Male. 218 – 222, Female. 213. Palp, retrolateral view. 214. Palp, prolateral view. 215. Embolus, prolateral view (arrow points to serrated extension). 216. Radical division, retrolateral view. 217. 218. Abdomen, dorsal view. 219. Epigynum, ventral view. 220. Internal genitalia, ventral view. 221. Internal genitalia, dorsal view. 222. Internal genitalia, lateral view (arrow points to basally folded lateral lobe).

FIGURES 223 – 232. Agyneta panthera n. sp. 223 – 227, Male. 228 – 232, Female. 223. Palp, retrolateral view. 224. Palp, prolateral view. 225. Embolus, prolateral view. 226. Radical division, retrolateral view. 227. 228. Abdomen, dorsal view. 229. Epigynum, ventral view. 230. Internal genitalia, ventral view. 231. Internal genitalia, dorsal view. 232. Internal genitalia, lateral view.

FIGURES 233 – 237. Agyneta miniata n. sp. 233 – 237, Male. 233. Palp, retrolateral view. 234. Palp, prolateral view. 235. Embolus, prolateral view. 236. Radical division, retrolateral view. 237. Abdomen, dorsal view.

FIGURES 25 – 30. 25. Agyneta protrudens (Chamberlin & Ivie 1933), chelicerae anterior view. 26. Agyneta maritima (Emerton 1919), chelicerae anterior view. 27. Agyneta fillmorana (Chamberlin 1919), embolus prolateral view. 28. Agyneta micaria (Emerton 1882), embolus prolateral view. 29 a. Agyneta decora (O. Pickard-Cambridge 1871), tracheal system dorsal view. 29 b. A. decora, tracheal base dorsal view. 30. A. decora, spiracles.