Glaresis arenata Gordon,

Gordon, Robert D. & Hanley, Guy A., 2014, Systematic revision of American Glaresidae (Coleoptera: Scarabaeoidea), Insecta Mundi 2014 (333), pp. 1-91: 21-22

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Glaresis arenata Gordon


Glaresis arenata Gordon 

Glaresis arenata Gordon 1974: 93  .

Description. Male. Length 3.8 mm, width 2.0 mm; body form elongate, somewhat slender, feebly widened from elytral base to apical 1/3 ( Fig. 12AView Figures 12). Color pale brownish yellow. Head with clypeal surface finely rugose with fine, sparse tubercles extended onto frons, frons densely rugose, vertex finely reticulate without basal carina, setae short, indistinct. Clypeal apex slightly raised, weakly sinuate with median emargination, lateral angles oblique, angulate ( Fig. 12BView Figures 12). Mandible pair symmetrical; mesal tooth strong; lateral prominence weak, outer margin rounded. Pronotum with distinct, long, transverse fovea in anterior 1/4 extended completely across pronotum, small slightly transverse fovea on each side of middle in anterior 1/2, wide, deep fovea on each side medially near lateral margin, distinct central furrow extended from base to transverse furrow; surface finely rugose, with sparse, straight setae-bearing carinae, setae decumbent, about 1/2 length of carina; anterior and lateral pronotal margins not bordered, all margins crenulate(Fig, 12C). Elytra with surface dull, finely microreticulate; all striae slightly convex, nearly flat, not carinate, remnants of carinae reduced to setal bases, seta much longer than base; intervals with large, shallow, slightly rectangular punctures ( Fig. 12CView Figures 12). Metasternum long, dull, finely, densely microreticulate, median surface without ridges, laterally with scattered, straight ridges in basal 2/3, median area flat, with median carina extended anteriorly from apical keel 1/2 or more distance to mesocoxae ( Fig. 12DView Figures 12); metasternal groove not visible. Lateral protibial teeth unevenly spaced, basal 2 teeth closer together. Mesotibia with 4 spines laterally, spinal bases widely separated, tibia slightly projecting at apex ( Fig. 12DView Figures 12). Posterior metatrochanteral margin without small teeth; posterosuperior surface of metatrochanter with single large tooth near femur ( Fig. 12GView Figures 12). Metafemoral surface with widely, evenly spaced, strong setae-bearing tubercles, microreticulate; width to length ratio 1.0:1.5, without noticeable flange on anterior margin; posterior metafemoral margin angulate next to trochanter; posterosuperior margin with 2 small teeth ( Fig. 12GView Figures 12). Metatibia broadly triangular, surface entirely microreticulate, with large, shelflike ridge about as wide as 1/2 metatibial width on outer margin postmedially, small teeth present on outer margin from near base to lateral ridge, single tooth present anterior to ridge, an irregular row of coarse tubercles extended from base nearly to apex medially, inner margin smooth, pubescent ( Fig. 12FView Figures 12). Apical margin of 5th abdominal ventrite weakly rounded. Genitalia long, basal piece longer than parameres, proximal end curved; median lobe shorter than parameres, tapered from base nearly to rounded apex, narrower at middle than a paramere, slightly curved upward in apical 1/3, parameres slightly curved before apex in lateral view, margin straight, apex narrowly rounded ( Fig. 12EView Figures 12).

Female. Apex of 5th abdominal ventrite strongly rounded.

Variation. Length 3.2 to 3.8 mm, width 1.7 to 2.2 mm. Lateral mesotibial spine number varies from 4 to 5; posterosuperior margin of trochanter may have 2nd tiny tooth; and surface of metatibia varies slightly in degree of sculpture.

Type locality. California, San Bernardino Co., 7 mi. SW Kelso, sand dunes.

Type depository. ( USNM).

Temporal distribution. April-May.

Geographical distribution. UNITED STATES. California: Imperial Co., Hwy 78, 1.3 miles SW Glamis; San Bernardino Co., Amboy R., 11-15 miles E 29 Palms, Wonder Valley, 2000 ft.; 7 mi. SW Kelso, sand dunes; Kelso sand dunes, 3.7 mi W Kelbaker Rd.; Kelso sand dunes. ( CMNC) ( CSCA) ( RCCC) ( USNM).

Remarks. Glaresis arenata  shares some G. canadensis  characters, especially the strongly tuberculate metatibial surface, and has 4 to 5 spines on outer mesotibial margin as does G. inducta  , but elytral stria without carinae distinguish G. arenata  from both species. In addition the posteromedian metatibial ridge is more well developed and transversely elongate in G. arenata  , and geographical distributions are widely disjunct..

Glaresis zvirgzdinsi  is similar in appearance and range, see Remarks under that species.


Smithsonian Institution, National Museum of Natural History


California State Collection of Arthropods














Glaresis arenata Gordon

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

Glaresis arenata Gordon 1974: 93

Gordon, R. D. 1974: 93