Agyneta protrudens Chamberlin & Ivie 1933
Creators: name: Dupérré, Nadine
Publisher: name: Zenodo
Year: 2013
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Linyphiidae
Agyneta
Agyneta protrudens

description: Agyneta protrudens (Chamberlin & Ivie 1933)
Figs 25, 97–103, map 4
Microneta protrudens Chamberlin & Ivie 1933: 37, pl. 9, f. 99. (Description Ƥ). Agyneta protrudens Buckle et al. 2001: 101. (Transferred from Microneta).
Type material: Microneta protrudens Chamberlin & Ivie 1933, Ƥ HOLOTYPE from Utah, Raft R. Mts., Clear Cr., 9/9/32, R.V. Chamberlin, N41:W113 (AMNH). EXAMINED.
Diagnosis: Males and females are easily distinguished by the protruding clypeus, straight in all other species. Males can be differentiated from all Agyneta by their curved lamella characteristica, ending in a arched sharp point (Fig. 97). From A. allosubtilis, A. watertoni (that have comparable lamella characteristica) by the absence of cymbial tubercles (Fig. 98). Females are differentiated from all species by the presence of V-shaped copulatory ducts visible on the epigynum (Fig. 101). From A. allosubtilis by the small rounded receptacula of the internal genitalia (Fig. 102), large and comma-shaped in the latter (Fig. 84) and from A. perspicua by the straight sides of the proximal part of scape (Fig. 101), sinuous in the latter (Fig. 94).
Description: Male: Total length: 1.62; carapace length: 0.72; carapace width: 0.57.
MAP. 4. Localities of Agyneta protrudens (Chamberlin & Ivie 1933).
CEPHALOTHORAX: Carapace light orange-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 3, protruding. Chelicerae yellow, with transverse gray band excavated (Fig. 25); seta-tipped tubercles absent; promargin 0 teeth, retromargin 0 denticle, both margins without projections near base of fang. Cheliceral stridulatory organ ~50 striae, well spaced slowly getting closer basally. ABDOMEN: Uniformly light to dark gray. LEGS: Yellow-orange; leg I total length: 2.13; leg III total length: 1.66; Tm I: 0.74, Tm IV: present. GENITALIA: Palpal retrolateral tibial apophysis triangular, smooth; dorsal tibial apophysis pointed, rugose; one retrolateral and one dorsal trichobothria (Fig. 97). Cymbium triangular; glabrous depression present (Fig. 97); cymbial tubercles absent; prolateral notch medium (Fig. 98). Paracymbium apical pocket medium, anterior pocket straight, posterior pocket short and curved (Fig. 97). Embolus tip pointed, slightly concave, one small sub-apical spine; basal flange serrated; Fickert’s gland absent; ventral lamella short with well sclerotized, serrated tip; thumb reaching below the embolus proper (Fig. 99). Embolus proper set apically, ventral and dorsal part of equal size (Fig. 99). Anterior terminal apophysis narrow, pointed tip with few, long protrusions and small spine at midpoint; posterior terminal apophysis striate, curved with one pointed tip; lamella characteristica tip wide with four small spikes and ending in a large prong (Fig. 100).
Female: Total length 1.67; carapace length 0.68, width 0.49.
CEPHALOTHORAX: Same coloration as male. Chelicerae yellow, not excavated; fangs as in male; promargin 0 teeth, retromargin 0 denticle. Cheliceral stridulatory organ ~40 striae, narrowly spaced throughout. ABDOMEN: Same as male. LEGS: Same as male; palpal tarsus not inflated, tarsal claw absent; leg I total length: 1.80; leg III total length: 1.49; Tm I: 0.64, Tm IV: present. GENITALIA: Epigynum with wide proximal part of scape, sides straight, oblique; epigynal slits oval; pit hook depression absent (Fig. 101); lateral lobes short and wide; stretcher seemingly absent; pit small (Fig. 102). Median part of scape short and wide; genital pores situated at base of lateral lobes pockets (Fig. 103). Internal genitalia with a small oval receptacula, obliquely positioned (Fig. 102).
Other material examined: CANADA: Alberta: Blood Indian Reserve, 1584m, 29.vi–06.vii.2000, yellow pan, lodgepole pine/aspen forest, unburned, 13, E. Kinsella (DBC); Bow river at Baker Creek, 26.viii.1965, 1Ƥ, J., W. Ivie (AMNH); near Baptiste Lake, 0 7–19. vi.1988, 13, 19.vi–10. vii.1988, 13, R. Holmberg (DBC); Wagner Natural Area, 6km E of Edmonton, 0 6–13.viii.1985, pan trap, 1Ƥ, A. Finnamore, T. Thormin, T. Spanton (DBC); Waterton Lakes National Park, 1584m, 26.vi–03.vii.2000, pan and yellow trap, lodgepole pine/aspen forest, burned, 131Ƥ, lodgepole pine/aspen forest, unburned, 1231Ƥ, 07.vii.1980, E. Kinsella (DBC); Waterton Lakes National Park, 07.vii.1980, F.I.T., 535Ƥ, H.Teskey (CNC); Waterton Lakes National Park, 9.6km from Chief Mountain Hwy., 1371m, 14–28.vi.1980, 732Ƥ, J. Campbell (CNC); Waterton Lakes National Park, Chief Mountain Hwy., 31.vii.1980, pitfall, 6Ƥ, D. Bright (CNC); 25km SW Rocky Mtn. House, 20.vii–03.viii.1995, pine forest, 5Ƥ, H. Carcamo (DBC). British Columbia: Johnson Bay, Babine Lake, 04.vii.1987, litter at side of lake and lagoon, 6Ƥ, leaf litter, 23, 0 2–15.vii.1985, sweeping, swamp, 13, 0 2–14.vii.1986, lakeshore debris, 231Ƥ, R. West (CNC); Mount Cain, 13.vii.1996, pan trap, 33, N. Winchester (DBC); Upper Carmanah Valley, 24.vi- 09.vii.1996, malaise trap, riparian, 20m from stream, 1Ƥ, N. Winchester (DBC). USA: Arizona: Chiricahua Mts., 2286 -2743m, 27.vii.1984, 33, V. Roth (CAS). California: Blacks Mtn., 17km SE of Willow Springs, vii.1999, pitfall, 7Ƥ, N. Rappaport (DUC); Chiricahua Mountains, Rustler Park, 2560m, 27.vii.1996, pine forest, 3Ƥ, D. Ubick (DUC); Mariposa Grove of Big Trees, 22.v.1936, 13, Crosby, Bishop (AMNH); near Tenent, Goosenest Adaptive Management Area, 14.viii.1999, pitfall, 1Ƥ, N. Rappaport (DUC); Yosemite Park, Yosemite Creek, 19.ix.1941, 1Ƥ (AMNH). Idaho: Sharon, viii.1931, 13, W. Gertsch (AMNH). Minnesota: Ottertail Co., 0 4– 12.vii.1966, pitfalls, 2Ƥ (DBC). Nebraska: Ruby Valley, 15.vi.1935, 138Ƥ, R. Chamberlin (AMNH). New Mexico: Mortland Canyon, 28.vi.1977, 13, D. Lowrie (AMNH). Oregon: 16km SSW Coos Bay, 16.vii.1968, 13, W. Ivie (AMNH); Mary's Park, 03.vi.1983, in moss riparian vegetation, 2Ƥ, D. Walker (AMNH); Pendleton, 09.viii.1919, 13 (AMNH). Utah: City Creek Canyon, 13.iv.1934, 232Ƥ, W. Ivie (AMNH); Cobble Rest Camp, Provo River, Uinta Mts., 20.viii.1942, 23, W. Ivie (AMNH); Currant Creek, 26.iv.1966, oak duff, 1Ƥ, G.F. Knowcton (USNM); Provo River, at North Fork, 18.vi.1941, 132Ƥ, W. Ivie (AMNH); West of Emory, 06.vi.1933, 3Ƥ, W. Ivie (AMNH). Washington: 1.60km E of Smallpox Bay, 170m, 17.vi.2000, moss on forest floor/dead wood, 2Ƥ, R. Crawford (UWBM); Bonanza Camp, Hwy. 97, 10.viii.1980, moss, leaf litter creek edge, 23, D. Caroll (CAS); Cove, S shore of Patos Island, 9m, 28.v–19.viii.1989, pitfalls, 2Ƥ, J. Bergdhal (UWBM); East of Active Cove (Patos Island), 21m, 28.v–19.viii.1989, pitfalls, 1Ƥ, J. Bergdhal (UWBM); Friday Harbor Laboratories, Biol. Preserve, 24m, 27.iv–12.viii.1989, pitfalls, near pond, 13, J. Bergdhal (UWBM); Green Canyon, 926m, 23.iii.2005, riparian Salix litter, 1Ƥ, R. Crawford (UWBM); Pend Oreille River, 932m, 23.vi.1992, willow litter 1Ƥ, R. Crawford (UWBM); Libby creek (at bridge), 472m, willow/alder litter litter 1Ƥ, R. Crawford (UWBM); Little Patos Island, 15m, 24.ix–18.xii 1989, pitfalls, forest, 1Ƥ, J. Bergdhal (UWBM); Pear Point, 51m, 09.vi.2001, alder in litter marsh, 1Ƥ, R. Crawford (UWBM); West of Black Lake, 1121m, pitfalls, near marsh, 233Ƥ, J. Bergdhal (UWBM); Morrison Canyon, 658m, 26.v.1986, Populus trichocarpa litter, 232Ƥ, R. Crawford (UWBM); Mt. Constitution (Bog#2), 670m, 17.iv–23.vii.1993, pitfalls, forest, 1Ƥ, J. Bergdhal (UWBM); N of Butte Camo, 1377m, 15–28.vii.1981, pitfalls, talus, 234Ƥ, D. Mann (UWBM); Rabbit Creek, 1066m, 18.vi.1989, alder litter, 1Ƥ, R. Crawford (UWBM); South hill of Clark Island, 15m, 13.iv–02.vi.1989, pitfalls, forest, 1Ƥ, J. Bergdhal (UWBM); South Fork Meadow Creek, 1173m, 14.viii.2004, Alnus-Salix thicket litter, 1Ƥ, R. Crawford (UWBM); Swauk Prairie NW of cemetery, 713m, 22.v.2008, hawthorn leaf litter, 13, R. Crawford (UWBM); Tichenal Canyon, 688m, 28.iv.1991, aspen litter, 1Ƥ, R. Crawford (UWBM); Umtanum Creek, 762m, 04.v.1985, Populus leaf litter, 1Ƥ, R. Crawford (UWBM); Rock Rabbit Lake, 1274m, 01.vii.2009, tapped from white pine cones, 1Ƥ, L. Ramseyer (UWBM).
Distribution: Western North America (British Columbia to New Mexico).
Notes: The holotype is missing all legs and epigynum. I feel confident that the specimen illustrated and described here coincides with A. protrudens described by Chamberlin & Ivie 1933, based on the presence of the protruding clypeus (not found in any other species) and the similar epigynum (compare illustrations of Chamberlin & Ivie 1933, pl. 9, fig. 99 and fig. 101).
description: Published as part of 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, pp. 1-189 in Zootaxa 3674 (1) on pages 34-36, DOI: 10.11646/zootaxa.3674.1.1, http://zenodo.org/record/283954