Glaresis zacateca Gordon and Hanley, 2014

Gordon, Robert D. & Hanley, Guy A., 2014, Systematic revision of American Glaresidae (Coleoptera: Scarabaeoidea), Insecta Mundi 2014 (333), pp. 1-91 : 48-49

Glaresis zacateca Gordon and Hanley , new species

Description. Male. Length 3.2 mm, width 1.6 mm; body form short, robust, widened from elytral base to apical 1/3 ( Fig. 33A ). Color dark yellowish brown. Head with clypeal surface coarsely rugose, frons finely rugose, vertex coarsely reticulate, entire head tuberculate, clypeal tubercles coarse, dense, tubercles on frons and vertex slightly smaller, sparse, setae short, barely evident. Clypeal apex truncate, with small tubercles, appearing serrate, lateral angles feebly oblique, acute ( Fig. 33B ). Mandible pair symmetrical; mesal tooth strong; lateral prominence strong, pronounced; outer margin angulate. Pronotum with deep, 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, deep central furrow extended from base to transverse furrow; surface densely rugose, with irregular, mostly vertical, dense setae-bearing carinae, setae decumbent, 1/2 length of carinae ( Fig. 33D ). Anterior and lateral pronotal margins not bordered, all margins crenulate. Elytra with surface dull, densely microreticulate; all striae distinctly, strongly carinate, carinae narrowly interrupted adjacent to space between interval punctures, each carinal segment bearing an apical seta about 1/2 length of segment; intervals with deep, slightly rectangular punctures ( Fig. 33C ). Metasternum long, surface dull, finely, densely microreticulate, not tuberculate medially, laterally with some elongate, oblique, setaebearing ridges, median area flat, with feeble carina extended from apical keel 2/3 distance to base; metasternal groove strong, deep, both margins ridged ( Fig. 33E ). Lateral protibial teeth unevenly spaced, basal two teeth close together. Mesotibia with 4 short, widely spaced spines laterally, tibia distinctly projecting at apex, projection apically acute. Posterior metatrochanteral margin lacking teeth, smooth, posterosuperior metatrochanteral surface with 1 tooth ( Fig. 33G ). Metafemoral surface with widely scattered, short, setae-bearing tubercles, microreticulate, dull throughout; width to length ratio 1.0:1.6, with broad flange on anterior margin; posterosuperior margin without teeth. Metatibia narrow at base, abruptly widened before apex, surface entirely, strongly microreticulate, lateral margin with strong, dentate posteromedian projection, margin anterior to projection with about 5 small, acute teeth, margin posterior to projection slightly uneven, medially with short row of about 3 small tubercles in basal 1/3, inner margin smooth, pubescent ( Fig. 33H ). Apical margin of male 5th abdominal ventrite feebly emarginate medially. Male genitalia short, basal piece much shorter than parameres, proximal end straight; median lobe slightly shorter than parameres, twice as wide at middle as paramere, slightly curved upward in apical 1/3, apex broadly rounded in ventral view; paramere tapered in lateral view, not flattened, tapered from base to nearly truncate apex ( Fig 33F ).

Female. Unknown.

Variation. Holotype only.

Type material. Holotype male: Mexico. Zacatecas: 10 mi. N Fresnillo, Zac. Mex , V-10 1962, F.D. Parker L.A. Stange Collectors ( CMNC).

Remarks. The unique holotype is most similar to G. confusa in most characteristics, including male genitalia. It is distinguished from that species by a lack of tubercles on vertex of head; metatibia with complete row of small, median tubercles; apex of male 5th abdominal ventrite weakly emarginate; and central Mexico type locality. Within Group C it is most similar to G. donaldi because both have a distinct posteromedian metatibial projection, but G. zacateca is distinguished from the former species by presence of tubercles on vertex of head; lack of reticulate carinae on metasternum; and metafemoral surface nearly smooth.

This is another member of Group C in a string of species extending from northern Mexico to Costa Rica. Species are now known from Coahuila, Zacatecas, Puebla, Guatemala, and Costa Rica, nearly all from unique specimens. This pattern seems to indicate the presence of other unknown southern species, particularly in central Mexico.

Etymology. This species is named for the state of Zacatecas where the holotype was found.

Figures

Figures 33A-33H. Glaresis zacateca, new species. A) Habitus view. B) Clypeus and head surface. C) Elytral striae. D) Pronotal surface and elytra. E) Metasternum. F) Male genitalia. G) Metalegs and trochanter. H) Metatibia, dorsal view.