Operclipygus impressicollis Caterino & Tishechkin 2013

Length: 2.00–2.03 mm, width: 1.62–1.72 mm; body rufescent, elongate oval, not strongly convex; frons and epistoma strongly depressed at middle, antennal bases prominent, frontal disk with moderately dense, conspicuous ground punctation; frontal stria rounded at sides, sinuate over antennae, weakened and variably interrupted at front; antennal club elongate, twice as long as wide, and twice as long as funicle; labrum about twice as wide as long, weakly emarginate apically; pronotal disk with very fine punctiform or narrowly linear prescutellar impression, fine, sparse ground punctation, and ~10 coarser lateral punctures; marginal pronotal stria not descending to hypomeron, often effaced in anterior half; submarginal pronotal stria continuous along anterior margin, reaching middle of pronotal side, usually obsolete in basal half; male pronotum with shallow, well-defined depression along and behind anterolateral portion of submarginal pronotal stria, the depression delimited posteriorly by a very finely crenulate stria parallel to submarginal stria which converges to submarginal stria at middle of pronotal side; female pronotum faintly or not at all depressed; elytra with two complete epipleural striae, outer subhumeral stria present in apical third, inner subhumeral stria absent, striae 1-4 complete, 5th stria present in posterior on-third or slightly more, sutural slightly longer; most of venter with microsculpture, only faint to lacking along metaventral midline; prosternal keel weakly emarginate at base, broad, with carinal striae well separated, depressed, prosternal lobe apex appearing slightly reflexed; mesoventrite very weakly projecting at middle, with marginal stria broadly interrupted; mesometaventral stria strongly arched forward to near mesoventral margin; metaventrite markedly convex in middle of basal half (in both sexes); lateral metaventral stria extending toward outer corner of metacoxa, but generally abbreviated just behind middle; lateral striae of 1st abdominal ventrite variable, never complete; propygidium and pygidium both with dense microsculpture; propygidium with moderately large punctures mainly in basal half; pygidium with fine sparse ground punctation, and few slightly larger punctures inconspicuously intermingled; marginal pygidial stria fine, obsolete in basal half or more. Male genitalia essentially indistinguishable from those of Operclipygus rufescens (see Figs 57A–D, L).