Operclipygus atlanticus, 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 : 182-183

Operclipygus atlanticus sp. n. Figs 47 C–D48E–F, M49CMap 17

Type locality.

BRAZIL: Minas Gerais: Viçosa [20°45'S, 42°53'W].

Type material.

Holotype male: "BRAZIL: Minas Gerais, Viçosa, 20°45'S, 42°53'W. October 2000, Flight intercept trap, F.Z.Vaz-de-Mello"/ "Caterino/Tishechkin Exosternini Voucher EXO-00318" (CEMT). Paratypes (3): same locality as type, IX.1999, E. Grossi, coll (UFPR, FMNH).

Other material.

1: BRAZIL:Espirito Santo: Mun. Linhares, Faz. Lagoa do Macuco, 19°03'50"S, 39°58'43"W, 10m, 27-i-2000 F. Genier & S. Ide, primary lowland Atlantic forest, FIT (CMNC).

Diagnostic description.

This species is very similar to the preceding, differing in a few characters as follows: length: 1.81-1.93 mm, width: 1.50-1.59 mm; body slightly less strongly convex; anterior submarginal pronotal stria more nearly straight across the front, not strongly arched into anterior corners; elytra with outer subhumeral stria present in apical half only, inner absent; propygidium with punctures more nearly round, sparser, separated by slightly more than their diameters; pygidium not strongly convex, with marginal sulcus obsolete in basal corners. Male: genitalia extremely similar to those of Operclipygus farctus (see Fig. 48A), except S8 (Fig. 48F) with apices of guides more strongly protuberant at inner angles; T9 (Fig. 48G) with bulbous basolateral angles; tegmen (Fig. 48M) slightly broader toward apex, more gently curved ventrad, not strongly bent.

Remarks.

Although very similar to Operclipygus distinctus , this species can be distinguished from it by its abbreviated outer subhumeral stria, less strongly convex pygidium, and submarginal pronotal stria (Fig. 49C) which is nearly transverse across entire front of pronotum. The single specimen from Espirito Santo differs slightly in having the male S8 widening slightly toward the apex, and the head of S9 more robust. Therefore we exclude it from the type series.

Etymology.

This species’ name refers to its occurrence only in the threatened Atlantic forests of southeastern Brazil.