Glaresis medialis Gordon,

Gordon, Robert D. & Hanley, Guy A., 2014, Systematic revision of American Glaresidae (Coleoptera: Scarabaeoidea), Insecta Mundi 2014 (333), pp. 1-91: 18-19

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Glaresis medialis Gordon


Glaresis medialis Gordon 

Glaresis medialis Gordon 1969: 508  ; Gordon 1970:508; Gordon 1974: 91.

Description. Male. Length 3.2 mm, width 1.7 mm; body form elongate, slightly widened from elytral base to apical 1/3 ( Fig. 10AView Figures 10). Color dark yellowish brown. Entire head surface densely microreticulate, dull, clypeus and frons with large tubercles (tubercles small in Idaho specimens) separated by diameter of a tubercle or less, setae short, barely visible. Clypeal apex weakly emarginate medially, somewhat sinuate, with large, evenly spaced tubercles, appearing dentate, lateral angles oblique, pronounced, outwardly toothed ( Fig. 10BView Figures 10). Mandible pair symmetrical; mesal tooth strong; lateral prominence strong, pronounced; outer margin abruptly rounded. Pronotum with all foveae weakly impressed except fovea on each side medially near lateral margin strongly impressed; surface densely rugose, with sparse, setaebearing carinae, carinae short, straight. Elytra with surface feebly shiny, densely microreticulate; all striae slightly convex, not carinate, with row of short setae; interval with shallow, round punctures ( Fig. 10CView Figures 10). Metasternum long, feebly shiny, finely, densely microreticulate, surface medially flat with faint carina extended from apical keel anteriorly 1/2 distance to mesocoxae, lateral surface without tubercles or ridges ( Fig. 10DView Figures 10); metasternal groove nearly invisible. Lateral protibial teeth unevenly spaced, basal 2 teeth close together. Mesotibia with 4 short spines laterally, 2 widely spaced spines in lateral emargination, 2 closely spaced spines on median projection, tibia strongly projecting at apex ( Fig. 10DView Figures 10). Posterior metatrochanteral margin without teeth, apical angle acutely toothed; posterosuperior surface of metatrochanter with single large tooth not visible directly in ventral view ( Fig. 10GView Figures 10). Metafemoral surface with widely scattered, elongate, setae-bearing tubercles, microreticulate; width to length ratio 1.0:1.6, with narrow flange on anterior margin; posterosuperior margin with single tooth. Metatibia broadly triangular, surface entirely microreticulate, with series of small teeth on outer margin, penultimate tooth largest, a row of sparse, small tubercles extended from base nearly to apex medially, inner margin smooth, pubescent ( Fig. 10FView Figures 10). Apex of 5th abdominal ventrite truncate. Genitalia long, basal piece shorter than parameres, proximal end curved; median lobe shorter than parameres, tapered from base to broadly rounded apex, very wide, more than twice width of paramere at middle, slightly curved upward before apex; parameres feebly sinuate in lateral view, apex bluntly rounded ( Fig. 10EView Figures 10).

Female. Apex of 5th abdominal ventrite weakly emarginate medially.

Variation. Length 3.2 mm to 3.6 mm, width 1.7 to 2.2 mm. Size and density of head tubercles varies from moderate sized, relatively sparse, to large, densely distributed; posterolateral mesotibial spines vary from 3 to 4, spacing also varies; mesotibia with 3 or 4 lateral spines; metatibial apex occasionally reduced, apically blunt.

Type locality. Utah, Logan.

Type depository. USNM.

Temporal distribution. June-July.

Geographical distribution. CANADA. British Columbia: Osoyoos; Penticton. UNITED STATES. California: Mono Co., Benton. Idaho: Owyhee Co., Bruneau Dunes; Owyhee Co., Bruneau State Park; Washington Co., Weiser Dunes. Nevada: Pershing Co., Humboldt River, above Rye Patch Reservoir; Pershing Co., Woolsey; White Pine Co., 15 mi. W. Ely. Oregon: Harney Co., Harney Lake dunes; Wasco Co., 8 mi. E. Hwy 26 on 216. Utah: Cache Co., Logan; Millard Co., Confusion Range-Fossil Mt.; Juab Co., 3 mi. S, 22 mi. E Callao; Sevier Lake, 22 mi. S, 33 mi. W Delta; Sevier Co., Richfield; Salt Lake Co., Salt Lake City; Toole Co., E. Dugway Dunes, Dugway Proving Ground; Utah Co., Goshen Warm Springs. Washington: Benton Co., Hanford Site; Franklin Co., Beverly Dunes; Benton Co., McNary Dam; Yakima Co., Toppenish; Winchester. Wyoming: Big Horn Co., Big Horn Canyon Rec. Area; Lincoln Co., Kemmerer; Sweetwater Co., Flaming Gorge, Blacks Fork River. ( BYUC) ( CASC) ( CSCA) ( CICC) ( JCIC) ( MJPC) ( RAAC) ( RBCM) ( UBCV) ( USNM) ( USUL) ( WSUC)

Remarks. Glaresis medialis  is most similar to G. phoenicis  but differs from that species by its heavily tuberculate clypeus and frons; apical clypeal tubercles large; elytral striae rounded, without trace of carinae; and outer metatibial margin with large, posteromedian tooth. This is primarily a northwest United States species with a range overlapping that of G. clypeata  , another member of the phoenicis Group.


California State Collection of Arthropods


China Center for Industrial Culture Collection


Royal British Columbia Museum


Smithsonian Institution, National Museum of Natural History














Glaresis medialis Gordon

Gordon, Robert D. & Hanley, Guy A. 2014

Glaresis medialis Gordon 1969: 508

Gordon, R. D. 1974: 91
Gordon, R. D. 1969: 508