Agyneta olivacea ( Emerton 1882 )

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 : 20-21

Agyneta olivacea ( Emerton 1882)

Figs 72–78 , map 2

Microneta olivacea Emerton 1882: 77 , pl. 24, f. 7. (Description 3); Emerton 1911: 396, pl. 3, f. 5 (Description Ƥ). Agyneta olivacea Kaston 1948: 134 . (Transferred Ƥ from Microneta ).

A. cauta Hackman, 1954: 15 , f. 24–31. (Ƥ, synonymy rejected).

Agyneta olivacea Hippa & Oksala 1985: 281 , f. 1B, E; 2E–F; 3A, F. (Ƥ; removed from synonymy of A. cauta ).

Type material: Microneta olivacea Emerton 1882 , 23 SYNTYPE from Mt. Washington, N. H., June 13, 1877. J.H. Emerton Coll. (unique number 22389). MCZ, EXAMINED.

Diagnosis: Males can be distinguished from all species by the leaf-like lamella characteristica apically excavated ( Fig. 72 ). From A. decora by the spine-like posterior pocket of paracymbium ( Fig. 72 ), elongated in the latter ( Fig. 64 ). Females can be distinguished from most species by the deep pit hook depression ( Fig. 76 ), from A. rurestris , A. jacksoni , A. nigripes , A. dynica , A. maritima by the presence of parentheses-shaped copulatory ducts visible on the epigynum ( Fig. 76 ).

Description: Male: Total length 1.85; carapace length 0.85, width 0.73.

MAP. 2. Localities of Agyneta olivacea ( Emerton 1882) , distribution based on material examined, distribution based on Paquin et al. 2010.

CEPHALOTHORAX: Carapace light brown-yellow, shiny, finely reticulate; suffused with dark gray along margin and radiating lines; trident mark present. Sternum brown-yellow strongly suffused with dark gray. Clypeus height 3. Chelicerae light brown-yellow with transverse gray band, excavated; fangs thick and wide; seta-tipped tubercles absent; promargin two teeth, retromargin one denticle, both margins without projections near base of fang. Cheliceral stridulatory organ ~54 striae, narrowly spaced throughout. ABDOMEN: Uniformly dark gray. LEGS: Yellow, tip of femur, tibia and metatarsus brown; leg I total length: 2.35; leg III total length: 1.95; Tm I: 0.88, Tm IV: present. GENITALIA: Palpal retrolateral tibial apophysis rounded, smooth; dorsal tibial apophysis rugose; one retrolateral and one dorsal trichobothria ( Fig. 72 ). Cymbium triangular; glabrous depression present ( Fig. 72 ); dorsal cymbial tubercle narrow, rugose; ventral cymbial tubercle triangular, rugose; prolateral notch shallow ( Fig. 73 ). Paracymbium apical pocket short, anterior pocket long and curved making a wide cover, posterior pocket spine-like ( Fig. 72 ). Embolus tip sharp and wide with slight retrolateral extension, one small subapical spine; basal flange with rows of small spines; Fickert’s gland medial, elongated; ventral lamella smooth, pointed; thumb reaching below the embolus proper ( Fig. 74 ). Embolus proper set apically, ventral part wider, with associated short, bifid prong ventrally ( Fig. 74 ). Radix with row of small spines retrolaterally; anterior terminal apophysis narrow with long protrusions; posterior terminal apophysis wide; lamella characteristica large, serrated apically, ending in three large spikes ( Fig. 75 ).

Female: Total length 2.09; carapace length 0.82, width 0.57.

CEPHALOTHORAX: Same coloration as male. Chelicerae yellowish, not excavated; promargin two teeth, retromargin one denticle. Cheliceral stridulatory organ ~46 striae, narrowly spaced throughout. ABDOMEN: Same as male. LEGS: Same as male; palpal tarsus inflated, claw absent; leg I total length: 1.86; leg III total length: 1.66; Tm I: 0.80, Tm IV: present. GENITALIA: Epigynum with proximal part of scape wide, sides straight; epigynal slits long and oval; pit hook depression deep ( Fig. 76 ); lateral lobes intermediate; stretcher and pit small ( Fig. 77 ). Median part of scape long and wide; genital pores situated at base of lateral lobes pockets ( Fig. 78 ). Internal genitalia with a large, elongated receptacula set obliquely ( Figs 77, 78 ).

Distribution: Holarctic.

Other material examined: CANADA: Alberta: Athabasca, 14–28.v.1986, black spruce muskeg, 23, 28.v– 11.vi.1986, black spruce muskeg, 1133Ƥ, 11–25.vi.1986, grain field, 11–25.vi.1986, black spruce muskeg, 631Ƥ, 18.vi–02.vii.1986, white spruce heath, 33, 02 –16.vii.1986, white spruce heath, 231Ƥ, 25.vi–09.vii.1986, black spruce muskeg, 2Ƥ, grain field, 1Ƥ, T. Rypien, R. Holmberg ( DBC); Birch Mountains Wildland Park, Big Island Lake, S shore, 11–22.vi.2004, 15–20 years old aspen and birch, 1Ƥ, T. Johnson ( DBC); Birch Mountains Wildland Park, Gardiner Lake, 15.vi–09.vii.2004, open black spruce, Labrador tea, sphagnum, pitfalls, 1237Ƥ, T. Johnson ( DBC); Caribou Mountains Wildland, Wentzel Lake, 13.vii.2003, along creek, 331Ƥ, T. Johnson ( DBC); Colin Lake Area, Esker Lake, 08–09.vii.2002, pitfalls, 1Ƥ, G. Hilchie, D. Hilchie, L. Ash ( DBC); Kakwa Wildland Provincial Park, Deadhorse Meadows-upper, 15–20.vi.2006, 231Ƥ, T. Johnson ( DBC); near Baptiste Lake, 27.iv– 11. v.1988, 13, 23.v–07. vi.1988, 2 Ƥ, 07–19.vi.1988, 131Ƥ, 19.vi–10. vii.1988, 1 Ƥ, R. Holmberg ( DBC); Wagner Natural Area, 6km W Edmonton, 16.v.–03. vi.1985, 23, 03–11.vi.1985, 33, 12–25. vi.1985, 23, 26.vi–02. vii.1985, 3 Ƥ, pitfalls, A. Finnamore, T. Thormin, T. Spanton ( DBC); Waterton Lakes National Park, 1600m, 26.vi– 03.vii.2000, lodgepole pine/aspen forest, unburned, pan traps, 123, E. Kinsella ( DBC); Willmore Wilderness Park, Beaverdam Pass, 11–19.vii. 2007, 1493m, sedge, willow meadow, G. Hilchie, J. Hilchie ( DBC); Willmore Wilderness Park, Casket Mountain, 12–20.vii.2007, 1700m, subalpine spruce, fir, 1133Ƥ, G. Hilchie, D. Macaulay ( DBC); Willmore Wilderness Park, Meadowland Creek, 1500m, 26.vi–11.vii.2007, meadow near creek, 43, 11 – 19.vii.2007, meadow edge, spruce-fir, 332Ƥ, G. Hilchie, D. Macaulay ( DBC); Willmore Wilderness Park, Pauline Creek, 1493m, 26.vi–11.vii.2007, meadow near creek, 13, G. Hilchie, D. Macaulay, 11–19.vii.2007, fen near river, 2Ƥ, G.Hilchie, D. Macaulay, 11–19.vii.2007, willow margin of fen, 1Ƥ, G. Hilchie, J. Hilchie ( DBC); Willmore Wilderness Park, Sheep Creek fire, 1511m, 19–27. vi.2007, 1 Ƥ, T. Johnson, G. Hilchie, 12–20.viii.2007, unburned spruce, pine forest, 1Ƥ, G. Hilchie, D. Macaulay ( DBC); Willmore Wilderness Park, Smoky River, 1054m, 28.vi.– 13.vii.2007, aspen spruce forest, 1Ƥ,G. Hilchie, D. Macaulay ( DBC); 25km SW Rocky Mtn. House, pine forest, 18.v–01.vi.1995, 931Ƥ, 01–16.vi.1995, 1135Ƥ, 16.vi–07.vii.1995, 1234Ƥ, 20.vii–03. viii.1995, 6 Ƥ, 03– 23. viii.1995, 2 Ƥ, 23.viii–23.ix.1995, 133Ƥ, H. Carcamo ( DBC). Manitoba: Riding Mountain National Park, 3km E Clear Lake, 29.viii.1979, 2Ƥ, S. Miller ( CNC); Riding Mountain National Park, Swanson Spring, 18.vii.1979, 73, D. Lyons ( CNC); South Indian Lake, 31.vii.1987, pitfall, lake shore, 2Ƥ ( CNC). Northwest Territories: Wrigley, 12–15.vi.1969, pan trap, 732Ƥ, G. Shewell ( CNC). Québec: Rouy-Noranda, Labyrinthe Lake, 16– 23.vi.1996, pitfalls, white-cedar and balsam-fir, 1Ƥ, P. Paquin, N. Dupérré ( DBC). Saskatchewan: 8km NE Saskatoon, 25.v–29.vi.1967, 2333Ƥ, E. Gorin ( DBC); 8km NE Simmie, 29.v–01.vi.1995, pitfalls, prairie, 131Ƥ, J. Pepper ( DBC); Anglin Lake, pitfalls, basin fen and surrounding Picea mariana woods, 25–30.vi.1995, 735Ƥ, 29.vii–13. viii.1995, 4 Ƥ, 07–29.vii.1995, 4327Ƥ, 13.viii–08. ix.1995, 1 Ƥ, D. Buckle ( DBC); Besnard Lake, 23.v.1970, litter in mixed woods, 1Ƥ, 10.viii.1970, carex marsh, 13, D. Buckle ( DBC); Cypress Hills, Centre Block, 21–22.vi.1972, pitfalls, poplar forest, 1Ƥ, D. Buckle ( DBC); Lady Lake, 27–28.v.1969, grass, slough margin, 1Ƥ, 15–17.vii.1970, carex marsh, 1Ƥ, D. Buckle ( DBC); St. Denis, pitfalls, native grass and trees, 04– 31.v.1995, 634Ƥ, 31.v–21.vi.1995, 533Ƥ, 21.vi–04. vii.1995, 13, pitfalls, cultivated trees, 31.v-21.vi.1995, 83, pitfalls, native grass and trees, 04–14.vi.1996, 832Ƥ, pitfalls, cultivated trees, 431Ƥ, K. Pivnick ( DBC); 9 km ESE Exshaw, 1524m, 17.vii–01.viii.1996, Pinus contorta forest, 7Ƥ, H. Carcamo ( DBC). USA: Alaska: Skagway, 24.vi.1936, 1Ƥ, C. Crosby ( AMNH); Topsy Creek, 105m, pitfalls, muskeg, 23.v–01. vi.1977, 13, 01–19.vi.1977, 53, 30.vi–07. ix.1977, 1 Ƥ, D. Mann ( UWBM).

Figures

FIGURES 72 – 78. Agyneta olivacea (Emerton 1882). 72 – 75, Male. 76 – 78, Female. 72. Palp, retrolateral view. 73. Palp, prolateral view. 74. Embolus, prolateral view. 75. Radical division, retrolateral view. 76. Epigynum, ventral view. 77. Internal genitalia, ventral view. 78. 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.