Operclipygus siluriformis Caterino & Tishechkin 2013

Length: 2.22–2.50 mm, width: 1.87–2.03 mm; body rufo-brunneus, elongate, nearly parallel-sided, sides of elytra weakly arcuate; frons moderately depressed behind frontal stria; frontal stria with sides divergent between eyes, sinuate above antennal bases, continuous, arcuate across front; supraorbital stria complete, meeting sides of frontal stria, area enclosed by frontal and supraorbital striae rather short; labrum about twice as wide as long, rather flat, apical margin shallowly emarginate; left mandible with short, blunt basal tooth, right mandible with more pronounced, subacute tooth; prothorax with disk vaguely and weakly impressed in prescutellar region, very fine, sparse ground punctation, relatively narrow band of ~10 punctures mediad lateral submarginal stria; marginal pronotal stria absent along most of anterior pronotal margin, complete lateral submarginal stria replacing it for a short distance at sides; marginal pronotal bead strongly convex, widening slightly toward the front; anterior submarginal stria weakly recurved posterad at sides; median pronotal gland openings anterolaterad ends of anterior submarginal stria, about three puncture widths from anterior margin; elytra with one complete epipleural stria, outer subhumeral stria complete, inner subhumeral stria absent, striae 1-4 complete, 5th stria present in apical third, sutural stria present in apical three-fourths, the sutural stria broadening toward base; prosternal keel with base rounded, produced strongly into mesoventrite, carinal striae complete, convergent from base, parallel in anterior half, united by narrow arch; prosternal lobe with complete marginal stria; mesoventral margin emarginate, with marginal stria interrupted; mesometaventral stria arched forward to anterior third of mesoventral disk, continued by lateral metaventral stria posterad toward middle of metacoxa; lateral part of metaventral disk with oblique secondary lateral stria; 1st abdominal ventrite with two complete lateral striae, parallel throughout their lengths; propygidium with fine, dense ground punctation at sides, in middle with slightly elongate, rather deep punctures separated by less than half their diameters, larger punctures also present along entire anterior and lateral margins of propygidium; pygidium with ground punctation as on sides of propygidium, with some larger punctures sparsely interspersed; marginal pygidial sulcus deep, complete, crenulate on inner and outer edges. Male: accessory sclerites absent; T8 with sides convergent from base to apex, apices truncate, apical emargination narrow, basal emargination shallow, nearly reaching basal membrane attachment line, ventrolateral apodemes most strongly developed near base, divergent to apex; S8 with sides with sides slightly divergent, apical guides narrow, gradually widened to apex, ventral halves approximate in basal half, divergent apically; T9 parallel-sided in basal two-thirds, convergent to apex, apices widened inward, apically truncate; T10 weakly sclerotized along midline, margins indistinct; S9 stem fairly wide, narrowest near apex, widened to broadly rounded base, with distinct apical emargination, apical flanges small and separate; tegmen stout, widest at middle, evenly narrowed to base and apex, apices broad, appearing truncate from above, with membraneous ventrolateral processes extending from apical corners; medioventral process not at all evident; basal piece almost half tegmen length; median lobe over half tegmen length, with wide gonopore, proximal apodemes strongly differentiated into short, broad, separated bases, and long, well sclerotized extensions reaching to base of tegmen.