Agyneta pistrix, 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 : 85-86

publication ID

https://doi.org/ 10.11646/zootaxa.3674.1.1

publication LSID

lsid:zoobank.org:pub:981F80ED-96D7-40C7-8A3C-677954416A2E

DOI

https://doi.org/10.5281/zenodo.6162370

persistent identifier

https://treatment.plazi.org/id/038D6700-FFE8-5642-118C-02BDAD88B249

treatment provided by

Plazi

scientific name

Agyneta pistrix
status

sp. nov.

Agyneta pistrix View in CoL new species

Figs 250–253 View FIGURES 246 – 253. 246 – 249 , map 17

Type material: Male holotype from Washington, Chelan County, Manson, Mone Rd. 47.917N, 120.125W, 21.ix.1982, riparian duff, D. Caroll ( CAS). EXAMINED.

Etymology: The specific name is a noun in apposition referring to the prong on the apical part of the embolus similar to a shark fin.

Diagnosis: Males are diagnosed from all other Agyneta species by the duck-shaped lamella characteristica ( Fig. 250 View FIGURES 246 – 253. 246 – 249 ). From A. fratrella by their more wide and rounded ventral cymbial tubercle ( Fig. 251 View FIGURES 246 – 253. 246 – 249 ), pointed an elongated in the latter ( Fig. 239 View FIGURES 238 – 245 ), from A. danielbelangeri by their larger dorsal cymbial tubercle ( Fig. 251 View FIGURES 246 – 253. 246 – 249 ), smaller in the latter ( Fig. 247 View FIGURES 246 – 253. 246 – 249 ).

Description: Male: Total length 1.89; carapace length 0.83, width 0.63.

CEPHALOTHORAX: Carapace orange-brown, shiny, finely reticulate; margin, radiating lines and pars cephalica lightly suffused with dark gray; trident mark present. Sternum orange-brown lightly suffused with dark gray. Clypeus height 3. Chelicerae orange-brown, excavated; ~ 18 seta-tipped tubercles; promargin three teeth, retromargin two tiny denticles and projection at base of the fang. Cheliceral stridulatory ~ 31 striae, well spaced closer basally. ABDOMEN: Uniformly medium gray. LEGS: Yellow-orange, femur darker orange; leg I total length: 3.06; leg III total length: 2.78; Tm I: 0.25, Tm IV: absent. GENITALIA: Palpal retrolateral tibial apophysis well sclerotized with small pointed tip; dorsal tibial apophysis with rounded tip, smooth, not strongly sclerotized; two retrolateral and one dorsal trichobothria ( Fig. 250 View FIGURES 246 – 253. 246 – 249 ). Cymbium triangular; glabrous depression present ( Fig. 250 View FIGURES 246 – 253. 246 – 249 ); dorsal cymbial tubercle anvil-shaped; ventral cymbial turbercle elongated with rounded rugose tip; prolateral notch deep ( Fig. 251 View FIGURES 246 – 253. 246 – 249 ). Paracymbium apically constricted, apical pocket long, anterior pocket short, deep and curved making a small cover, posterior pocket absent ( Fig. 250 View FIGURES 246 – 253. 246 – 249 ). Embolus tip pointed with acute prong apically; ventro-retrolaterally with rows of spines; basally excavated with flange; Fickert’s gland elongated, set basally; ventral lamella transparent, pointed; thumb elongated, reaching beyond the embolus proper, with sclerotized tip ( Fig. 252 View FIGURES 246 – 253. 246 – 249 ). Embolus proper set basally ( Fig. 252 View FIGURES 246 – 253. 246 – 249 ). Anterior terminal apophysis long and narrow with very long protrusions; posterior terminal apophysis small, with rounded tip and a large curved basal prong; lamella characteristica wide with pointed transparent process ( Fig. 253 View FIGURES 246 – 253. 246 – 249 ).

Female: Unknown.

Other material examined: USA: Washington: north fork of Colockum [47.24N, 120.296W] 1499m, 10.vii.2004, riparian Salix litter, 13, R. Crawford ( UWBM).

Distribution: Northwest USA.

The picta View in CoL group includes four species found in southern USA, A. picta ( Chamberlin & Ivie 1944) View in CoL , A. flax View in CoL n. sp., A. barfoot View in CoL n. sp. and A. sandia View in CoL n. sp.

One unique character unites this group, the long and thin distal suprategular apophysis tip ( Fig. 254 View FIGURES 254 – 264 ) of the male palp. Members are diagnosed by a combination of characters: male chelicerae excavated, with seta-tipped tubercles and rounded projections near base of fangs. Palpal cymbium with dorsal and ventral cymbial tubercles, the ventral one being the largest ( Figs 255 View FIGURES 254 – 264 , 266 View FIGURES 265 – 273 , 275 View FIGURES 274 – 282 , 284 View FIGURES 283 – 289 ). Tibia with two retrolateral trichobothria and a dorsal one; retrolateral tibial apophysis well developed; paracymbium with three pockets ( Figs 254 View FIGURES 254 – 264 , 265 View FIGURES 265 – 273 , 274 View FIGURES 274 – 282 , 283 View FIGURES 283 – 289 ). Embolus with pointed ventral lamella; short thumb and a basally, elongated Fickert’s gland ( Figs 256 View FIGURES 254 – 264 , 267 View FIGURES 265 – 273 , 276 View FIGURES 274 – 282 , 285 View FIGURES 283 – 289 ). Females have a plate-like proximal part of scape; very large lateral lobes and no pit hook depression ( Figs 261 View FIGURES 254 – 264 , 271 View FIGURES 265 – 273 , 280 View FIGURES 274 – 282 , 287 View FIGURES 283 – 289 ).

Interestingly, males of A. picta View in CoL and A. flax View in CoL exhibit morphological ant mimicry, a cylindrical abdomen with a wide, pale middle band ressembling a constriction ( Figs 258 View FIGURES 254 – 264 , 269 View FIGURES 265 – 273 ).

CAS

California Academy of Sciences

UWBM

University of Washington, Burke Museum

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Linyphiidae

SubFamily

Micronetinae

Genus

Agyneta

Loc

Agyneta pistrix

Dupérré, Nadine 2013
2013
Loc

A. picta (

Chamberlin & Ivie 1944
1944
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