Operclipygus tenuis, Caterino, Michael S. & Tishechkin, Alexey K., 2013

Caterino, Michael S. & Tishechkin, Alexey K., 2013, A systematic revision of Operclipygus Marseul (Coleoptera, Histeridae, Exosternini), ZooKeys 271, pp. 1-401 : 141-142

Operclipygus tenuis sp. n. Map 13

Type locality.

BRAZIL: Espirito Santo: Fazenda Lagoa do Macuco [19°3.833'S, 39°58.717'W].

Type material.

Holotype male: "BRAZIL: Espirito Santo: Mun. Linhares, Faz. Lagoa do Macuco, 19°03.833'S, 39°58.717'W 10m 27-I-2000 F. Genier & S. Ide ex. flight int. trap 3, day 1-3, primary lowland Atlantic forest, sandy soil BRA1G00 036"/ "SM0809949 KUNHM-ENT" (SEMC). Paratypes (2): BRAZIL: Minas Gerais: 1: Ingaí, Res. Boqueirão, nr. Lavras, 21°21'S, 44°59'W, 4-11.xii.2002, FIT, R.J. Silva (CEMT); Rio de Janeiro: 1: Nova Friburgo, Sans Souci, 9-15.xi.2009, FIT, E. Grossi (UFPR).

Diagnostic description.

Length: 1.50-1.78 mm, width: 1.15-1.22 mm; body elongate, sides subparallel; frons depressed at middle; frontal stria with sides strongly divergent along inner edge of eye, arcuate at sides above antennal bases but slightly arched dorsad across middle; epistoma rather flat, coplanar with labrum, emarginate anteriorly; labrum flat, narrowed to apex, almost two-thirds as long as wide, with apical margin weakly rounded; left mandible with bluntly bifid basal tooth, right mandible with subacute tooth; pronotal disk with narrow, linear prescutellar impression slightly longer than scutellum, ground punctation very fine and sparse, with ~12 coarser punctures posterolaterad apices of anterior submarginal stria; lateral submarginal stria complete, close to side, bent inward rather abruptly in front, ending freely; anterior submarginal stria recurved obliquely posterad about one-fifth pronotal length; median pronotal gland openings next to anterior submarginal stria, about 6 puncture widths from anterior margin; elytra with outer subhumeral stria present in just over apical half, inner subhumeral stria absent, striae 1-4 complete, 5th stria present in apical half, sutural stria present in apical three-fourths; prosternal keel narrowly rounded at base, carinal striae long, subparallel in anterior three-fourths, united in narrow arch, just divergent at base; stria of prosternal lobe interrupted at middle and shortened at sides; mesoventral margin narrowly emarginate, marginal stria complete; mesometaventral stria rather broadly arched forward to near mesoventral stria, mesoventral disk with conspicuous transverse microsculpture; lateral metaventral stria sinuate at sides, extending toward posterior corner of metacoxa; 1st abdominal ventrite with two complete, parallel lateral striae, inner ones barely extending mediad along basal margin; propygidium with rather larger, shallow punctures separated by about two-thirds their diameters; pygidium with fine, dense ground punctation and coarser punctures fairly densely interspersed, particularly toward basal margin; marginal pygidial sulcus complete, narrow but deeply impressed, weakly crenulate along inner and outer edges. Male genitalia more or less indistinguishable from those of Operclipygus minutus (see Figs 38 A–D), showing the distinct desclerotization around the apical emargination of T8; accessory sclerites of T8 somewhat smaller.

Remarks.

This species is very similar to Operclipygus subterraneus , but may be distinguished by its complete frontal stria, as well as its long, close and parallel prosternal striae.

Etymology.

This species’ name refers to its slender, elongate body form.