Agyneta perspicua, 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 : 24-33

Agyneta perspicua new species

Figs 90–96 , map 3

Type material: Male holotype from Canada, British Columbia, Cross Creek, 2 mi. W Babine Lake, 05.viii.1987, moss beside creek, R. West ( CNC). EXAMINED.

Etymology: The specific name is adjective in apposition meaning transparent, in reference to the somewhat transparent lamella characteristica of the male palp.

Diagnosis: Males can be differentiated from all Agyneta species by the unique V-shaped lamella characteristica ( Fig. 90 ). From A. protrudens by the long apical pocket of paracymbium ( Fig. 90 ), shorter in the latter ( Fig. 97 ). Females are distinguished from most species by the large peanut-shaped receptacula of the internal genitalia ( Fig. 95 ). From A. decora and A. protrudens by the short sinuous sides on the proximal part of scape ( Fig. 94 ), long in A. decora ( Fig. 68 ) and straight in A. protrudens ( Fig. 101 ).

Description: Male: Total length 1.60; carapace length 0.70, width 0.59.

CEPHALOTHORAX: Carapace light brown, shiny, finely reticulate; suffused with dark gray along margin, radiating lines; trident mark present. Sternum dark brown strongly suffused with dark gray. Clypeus height 4. Chelicerae yellow with transverse gray band, not excavated; fangs thick and wide; seta-tipped tubercles absent; promargin two denticles, retromargin 0 denticle, both margins without projections near base of fang. Cheliceral stridulatory organ ~60 striae, narrowly spaced throughout. ABDOMEN: Uniformly dark gray. LEGS: Yellow; leg I total length: 2.01; leg III total length: 1.72; Tm I: 0.86, Tm IV: present. GENITALIA: Palpal retrolateral tibial apophysis rounded, smooth; dorsal tibial apophysis rugose; one retrolateral and one dorsal trichobothria ( Fig. 90 ). Cymbium triangular; glabrous depression present ( Fig. 90 ); cymbial tubercles absent; prolateral notch shallow ( Fig. 91 ). Paracymbium apical pocket long, anterior pocket curved and deep reaching the short and curved posterior pocket ( Fig. 90 ). Embolus tip wide, pointed with small retrolateral extension; basally with short flange; Fickert’s gland absent; ventral lamella wide, transparent; thumb reaching the embolus proper ( Fig. 92 ). Embolus proper set apically, dorsal part slightly wider ( Fig. 92 ). Anterior terminal apophysis narrow with a few, long protrusions; posterior terminal apophysis short twisted; lamella characteristica wide, ending in two pointed tips with a few small spikes ( Fig. 93 ).

Female: Total length 1.78; carapace length 0.72, width 0.52.

CEPHALOTHORAX: Same coloration as male. Chelicerae yellow, not excavated, fangs as in male; promargin two teeth, retromargin one denticle. Cheliceral stridulatory organ ~39 striae, narrowly spaced throughout. ABDOMEN: Same as male. LEGS: Same as male; palpal tarsal claw absent; leg I total length: 1.80; leg III total length: 1.56; Tm I: 0.84, Tm IV: present. GENITALIA: Epigynum with wide proximal part of scape, sides short and sinuous; epigynal slits small, oval; pit hook depression apparently absent ( Fig. 94 ); lateral lobes short and wide; stretcher indistiguishable ( Fig. 95 ). Median part of scape short and wide; genital pores situated at base of lateral lobes pockets ( Fig. 96 ). Internal genitalia with a large peanut-shaped receptacula ( Fig. 95 ).

Other material examined: CANADA: Alberta: Kakwa Wildland Provincial Park, Kakwa River Meadow, 24.vi–18.vii.2006, riparian grass, 43, T. Johnson ( DBC); Kakwa Wildland Provincial Park, ridgeline near Deadhorse Meadows Equestrian Campground, 15–25.vi.2006, 631Ƥ, 17–22.vii.2006, 33, pine, spruce, rhododendron, T. Johnson ( DBC); Waterton Lakes National Park, 1584m, 26.vi–03.vii.2000, 3534Ƥ, 28.viii– 11. ix.2000, 1 Ƥ, pan trap and yellow pan, lodgepole pine/aspen forest, unburned, E. Kinsella ( DBC). British Columbia: MASS Project., near Campbell River, 29.vi.1996, canopy, 1Ƥ, L. Humble ( DBC). USA: Alaska: Cenotaph Island, 38m, 30.vi–10.ix.1997, pitfalls, spruce-hemlock forest, 1Ƥ, D. Mann ( UWBM); Cenotaph Island (camp), 9m, 12.vi.1977, wave scar alder forest, 13, D. Mann ( UWBM); Cenotaph Island, SW side, 9m, 10– 18.v.1977, wave scar alder forest, 13, D. Mann ( UWBM); Chichagof Island (forest road 8530), 30.iv–04. v.2003, 23, J. Slowick ( DBC); Mount Blunt, 640m, 04.vi–01.vii.1977, pitfalls, shrublands, 13, D. Mann ( UWBM); Mount Blunt, 792m, 24.vi–09.vii 1981, pitfalls, lush alpine meadow, 13, D. Mann ( UWBM); 6.5km SE Lituya Bay, 15m, 0 8–19. vi.1977, 1 Ƥ, ix.1977, 1 Ƥ, pitfalls, ryegrass beach meadow, D. Mann ( UWBM); 8.7 km NW Gustavus head of Bartlett Cove, 22, 13 -15.ix.1977, spruce soil, 1Ƥ, D. Mann ( UWBM). California: Mendocino, 13, J. Helfer ( AMNH). Washington: Camas Land, 877m, 12.vi.2007, Crataegus douglasii litter, 131Ƥ, R. Crawford ( UWBM); Central hill of Patos Island, 15m, 28.v–19.viii.1989, pitfalls, 13, J. Bergdahl ( UWBM); Central valley of Patos Island, 9m, 28.v–19.viii.1989, pitfalls, 1Ƥ, J. Bergdahl ( UWBM); Fort Ebey State Park, 17.vi.1987, alder-hemlock litter, 13, R. Crawford ( UWBM); Pat's Prairie, 815m, 16.v.1992, sphagnum in bod/meadow, 13, R. Crawford ( UWBM); Rabbit creek, 1066m, 18.vi.1989, alder litter, 1310Ƥ, R. Crawford ( UWBM); Schriebers Meadow, 1066m, 14.vii.2007, sphagnum in small patch, 1Ƥ, R. Crawford ( UWBM).

Distribution: Northwestern Canada and USA.

Figures

FIGURES 90 – 96. Agyneta perspicua n. sp. 90 – 93, Male. 94 – 96, Female. 90. Palp, retrolateral view. 91. Palp, prolateral view. 92. Embolus, prolateral view. 93. Radical division, retrolateral view. 94. Epigynum, ventral view. 95. Internal genitalia, ventral view. 96. Internal genitalia, dorsal view.

FIGURES 97 – 103. Agyneta protrudens (Chamberlin & Ivie 1933). 97 – 100, Male. 101 – 103, Female. 97. Palp, retrolateral view. 98. Palp, prolateral view. 99. Embolus, prolateral view. 100. Radical division, retrolateral view. 101. Epigynum, ventral view. 101. Internal genitalia, ventral view. 103. Internal genitalia, dorsal view.

FIGURES 64 – 71. Agyneta decora (O. Pickard-Cambridge 1871). 64 – 67, Male. 68 – 71, Female. 64. Palp, retrolateral view. 65. Palp, prolateral view. 66. Embolus, prolateral view. 67. Radical division, retrolateral view. 68. Epigynum, ventral view. 69. Internal genitalia, ventral view. 70. Internal genitalia, dorsal view. 71. Internal genitalia, lateral view.