Operclipygus sulcistrius Marseul, 1870

Caterino, Michael S. & Tishechkin, Alexey K., 2013, A systematic revision of Operclipygus Marseul (Coleoptera, Histeridae, Exosternini), ZooKeys 271, pp. 1-401 : 30-32

Operclipygus sulcistrius Marseul, 1870 Figs 37A

Operclipygus sulcistrius Marseul, 1870: 75.

Type locality.

Unspecified, somewhere along the Amazon in Brazil.

Type material.

Lectotype, here designated (MNHN): original handwritten green disk label barely legible:?" Operclipygus sulcistrius Amazons Bates 69" [type locality as published is "Fleuve des Amazones"] / “TYPE” / MUSEUM PARIS COLL. DE MARSEUL 2842-90" / "LECTOTYPE Operclipygus sulcistrius Marseul 1870, M.S.Caterino & A.K.Tishechkin des. 2010". This species was described from an unspecified number of specimens, and the lectotype designation fixes primary type status on the only known specimen.

Diagnostic description.

Length: 2.59 mm, width: 1.68 mm; body rufescent; frontal stria strongly impressed, complete to sides and continuous with supraorbital. Lateral pronotal stria complete, close to margin and carinate, continuous to front through strongly depressed anterior corners, meeting anterior portion of anterior submarginal stria, which is recurved about 1/4 the length of the pronotal disk; pronotal disk moderately convex, punctate throughout, with numerous larger punctures toward sides. Elytra with outer subhumeral and dorsal striae 1-5 complete, strongly impressed, stria 5 attached to sutural stria by basal arch, only the inner subhumeral stria absent. Prosternum with striae meeting in a narrow arch anteriorly, ending well behind presternal suture. Propygidium flat, with many close large, elongate punctures; pygidium with only a few large punctures along basal margin, finely but distinctly punctate elsewhere; apical sulcus well impressed and crenulate around apical margin. Male genitalia as described for the species group (Fig. 3).

Distribution.

This species is only known from the type specimen, from somewhere along the Amazon River ( ‘fleuve’).

Remarks.

This species can be separated from the others in this group by its basally connected 5th and sutural striae (shared with Operclipygus lucanoides ) in combination with the relatively weakly elevated anterior pronotal margin, complete absence of the inner subhumeral striae, and relatively simple frons bordered by a complete supraorbital stria.