Erigone denticulata Chamberlin & Ivie

Cokendolpher, JAMES C., Torrence, SHANNON M., Smith, LOREN M. & Dupérré, Nadine, 2007, New Linyphiidae spiders associated with playas in the Southern High Plains (Llano Estacado) of Texas (Arachnida: Araneae), Zootaxa 1529, pp. 49-60: 56-57

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Erigone denticulata Chamberlin & Ivie


Erigone denticulata Chamberlin & Ivie 

(Figs 7, 9, 17-23)

Erigone denticulata Chamberlin & Ivie  1939, 57, fig. 2; Levi & Levi 1951, 220; Levi & Levi 1955, 36; Buckle et al. 2001, 116; Platnick 2007.

Type material.- U.S.A.: Utah: Summit County: Mirror Lake, Uintah Mountains, N40°42' W110°49', 22 Sept. 1932, W. Ivie, male holotype (not examined).GoogleMaps  Mirror Lake, N40°43' W110°53', 28 July 1936, Wilton Ivie, 3 males labeled by Ivie as paratypes ( AMNH, examined).GoogleMaps 

Material examined.- U.S.A.: Colorado: Grand County: Hot Sulphur Springs, N40°6' W106°9', 24 Aug. 1935, W. Ivie, 1 male, 1 female ( AMNH).GoogleMaps  Idaho: Payette County: N.E. Fruitland, N44°1' W116°55', 1 July 1938, W. Ivie, 4 males, 1 females ( AMNH).GoogleMaps  Nevada: Elko County: Ruby Valley, N40°15' W115°25', Sept. 1937, R.V. Chamberlin, 4 males, 3 females ( AMNH).GoogleMaps  Oregon: Malheur County: 8 km south of Adrian, N43°40' W117°, 19 Sept. 1943, W. Ivie, 3 males, 1 female ( AMNH).GoogleMaps  Texas: Lubbock County, Lubbock , N33° 32'2" W101°53'23", Sept. 2006, J.C. Cokendolpher, in wet greenhouse next to man-made pond, 1 female ( TTU-Z 29,680);GoogleMaps  same locality & collector, on waterfall of man-made pond, 11 June 2007 ( AMNH);GoogleMaps  Briscoe County: Playa Br5, N34°29'4.91999" W101°9'54.359", 17 June 2005, S.M. Torrence, L.M. Smith, 1 female ( AMNH);GoogleMaps  Playa Br13, N34°32'12.336" W101°17'37.212", 15 June 2005, S.M. Torrence, L.M. Smith, 1 female ( CPAD).GoogleMaps  Playa Br13, N34°32'12.336" W101°17'37.212", 17 June 2005, S.M. Torrence, L.M. Smith, 1 female ( TTU-Z 29,683).GoogleMaps  Playa Br19, N34°28'19.01999" W101°15'32.616', 22 June 2005, S.M. Torrence, L.M. Smith, 1 male, 1 female ( TTU-Z 29,681 and 29,679);GoogleMaps  26 June 2005, S.M. Torrence, L.M. Smith, 1 female ( TTU-Z 29,682).GoogleMaps  Swisher County: Playa S6, N34°32'37.644" W101°34'14.808", 21 June 2005, S.M. Torrence, L.M. Smith, 1 male ( CPAD).GoogleMaps  Utah: Summit County: Mirror Lake, Uintah Mountains, N40°43' W110°53', 22 Sept. 1932, W. Ivie, 3 females ( AMNH).GoogleMaps  Wyoming: Albany County: southeast of Laramie, N41°10'5" W 105°21'0", July 1961, W.D. Fronk, 1 male, 1 female ( AMNH).GoogleMaps 

Diagnosis.-Male with marginal rows of large and smaller sharp pointed denticles on the sides of carapace (Figs 7, 9, 17); pedipalpal patella with large and long distal apophysis, with single small denticle at about midpoint (Figs 7, 18); pedipalpal tibia straight across distodorsal end, not notched or otherwise modified in center (Fig. 16). Female epyginum with only slightly rounded lobes posteriorly (Fig. 21); spermathecae elongate and compressed in center (Figs 22, 23).

Description (Briscoe County, specimens illustrated).-Male (Fig. 9): Total length: 2.18 mm; carapace length: 1.05 mm; carapace width (excluding denticles): 0.77 mm; carapace with lateral row of denticles with a small ridge above row (Fig. 7; similar to Hormiga 2000, fig. 86a). Sternum darker brown. Chelicera depressed basally on retrolateral marginal face, with 8 large, distally curved denticles on anteriolateral margins and 10- 12 denticles scattered over promargin basally, also few short thick macrosetae basal to stridulatory file, promargin with 1 mega denticle and 1 large denticle, retromargin with 3 denticles plus 1 smaller distal denticle; cheliceral stridulatory file as large striae on posteriolateral surface (visible with dissection microscope). Cheliceral fang thickened on basal half and with a brush of very fine denticles centrally. Abdomen 1.13 mm long, uniformly colored, no patterns. Legs, tibia I–IV with one dorsal macroseta; metatarsus I with dorsal trichobothrium, TmI 0.43, TmIV 0.52. Pedipalpal femur curved mesally, then dorsally, recurved at distal end (Figs 9, 18), mesal side with longitudinal row of denticles; patella with a thick, stout, apophysis (Figs 7, 18); tibia straight across distodorsal end, not notched or otherwise modified in center, mesal side (about 2/3 from basal end) with raised area tipped with small spur-like point (Fig. 18, 19); embolus thick, straight, pointed at tip (Figs 18, 19); other details of pedipalp as in Fig. 19.

Female: Total length: 2.65 mm, carapace length: 1.05 mm, carapace width: 0.75 mm; carapace coloration as in male, pattern 3 erect setae along midline. Carapace and chelicerae dark amber to yellowish-brown, sternum darker brown; carapace elevated in anterior third; posteriolateral margins of carapace with noticeable small granules to minute denticles; without ridge laterally as in male. Chelicera slightly enlarged basally, with 6-8 denticles in a row on anteriolateral margin; promargin of cheliceral fang furrow with 2 larger and 3 smaller denticles (distal most minute), retromargin with 3 denticles (one distal smaller denticle on each chelicera); stridulatory file not visible with dissection microscope (present as striae on posteriolateral margin at 200 X). Abdomen unpatterned, darker brown to gray brown, darker than carapace; length 1.60 mm, densely covered with semi-erect setae. Legs light yellow to amber, tibia I–IV each with one dorsal macroseta; metatarsus I with dorsal trichobothrium, TmI 0.57, TmIV absent. Posterior portion of the epigynal plate sclerotized (Fig. 21). Spermathecae only slightly visible through the cuticle and not extending much beyond the epigynal plate (Figs 22, 23). Spermathecae oval and oriented obliquely, fertilization ducts only slightly curved, copulatory ducts long and curved (Fig. 23).

Distribution.-Known from Colorado, Idaho, Montana, Nevada, Oregon, Texas, Utah, and Wyoming in the central and northwestern U.S.A.

Habitat.-In the present study we only found specimens in the canopy of emergent aquatic vegetation within playa wetlands and next to a man-made pond in a wet greenhouse. Levi & Levi (1951) stated that this species was also collected at Moran (Grand Teton National Park, Teton County, Wyoming) from an aspen grove.

Remarks.-In the original description of this species, Chamberlin & Ivie (1939) stated that E. denticulata  was related to Erigone ostiaria Crosby & Bishop,  but differed by being larger in size and by the details of the pedipalpus. By comparing Crosby & Bishop (1928) figs 149-151 to our Figs 13-15 the pedipalpal differences are apparent. Also, E. ostiaria  is thus far only known from Washington State, U.S.A.

In having a mid-position denticle on the pedipalpal patella, this species could be confused with Erigone dentosa O. Pickard-Cambridge  (from British Columbia south to Guatemala); however, the denticle on E. dentosa  is noticeably larger and distinctly curved distally (Crosby & Bishop 1928, fig. 42). These are not very closely related species, but the denticle is used in the diagnoses presented by Crosby & Bishop (1928).

Crawford (in Buckle et al. 2001 p. 116) stated that this species is probably the same as Erigone aletris Crosby & Bishop.  These two species appear similar, especially in the details of the pedipalp in ventral view, but we are able to separate the two taxa. As illustrated by Paquin & Dupérré (2003, figs 958-963) E. aletris  differs from E. denticulata  in features of the male and female genitalia. Erigone aletris  occurs throughout much of the northern Holarctic region and appears to be absent from the plains of the central U.S.A.


USA, New York, New York, American Museum of Natural History