Operclipygus quinquestriatus, 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 : 213-214

Operclipygus quinquestriatus sp. n. Figs 57 E–H 58DMap 20

Type locality.

MEXICO: Chiapas: Sumidero National Park [16°50'N, 93°5.5'W].

Type material.

Holotype male: "MEXICO: Chiapas, Pq. Nac. Sumidero, 1000m. F.I.T. 25 May 1990. H.&A.Howden"/ "Caterino/Tishechkin Exosternini Voucher EXO-00333" (CNCI). Paratype: 1: same data as type (BDGC).

Diagnostic description.

Length: 1.75-2.06 mm, width: 1.50-1.65 mm; body rufescent, elongate ovoid, widest well behind humeri, moderately, evenly convex; microsculpture almost completely absent, vague rudiments present at sides of abdominal sterna; frons flat, not markedly depressed at middle, frontal stria complete; supraorbital stria absent; labrum about twice as wide as long, weakly emarginate apically, with weak apical process below margin; left mandible untoothed, right with small, subacute basal tooth; antennal club only slightly elongate; pronotal disk lacking prescutellar impression, ground punctation sparse, but conspicuous, with few coarser punctures sparsely scattered along sides; marginal stria barely descending to hypomeron at sides, only narrowly interrupted behind head; lateral submarginal pronotal stria complete, close to side, curving inward toward front, nearly meeting anterior submarginal stria, which is recurved posterad about one-third the length of the pronotal disk; median pronotal gland openings about two-thirds pronotal length from anterior margin; elytra with two complete epipleural striae, outer subhumeral stria nearly complete, but briefly interrupted at middle, inner subhumeral stria absent, striae 1-5 complete, sutural stria barely abbreviated basally; prosternal keel weakly emarginate at base, with complete carinal striae barely converging anteriorly, united in anterior arch; prosternal lobe with nearly complete marginal stria very close to margin; mesoventral margin with narrow, but distinct median projection, marginal stria complete; mesometaventral stria narrowly angulate anteriorly, reaching just forward of mesoventral midpoint; lateral metaventral stria extending to middle of metacoxa; 1st abdominal ventrite with complete inner lateral stria, outer slightly abbreviated, sides of disk with punctures coalesced into elongate strigosity; propygidium with ground punctation fine, sparse, with small round punctures evenly separated by about their diameters; pygidium with fine, sparse ground punctation and very few coarser punctures interspersed, mainly in basal corners; marginal pygidial stria fine, nearly complete, though obsolete at base and narrowly interrupted at apex. Male genitalia (Figs 57 E–H) extremely similar to those of Operclipygus geometricus , differing by T8 with sides slightly narrowing; S8 shorter, sides more strongly convergent toward apex, apical guides narrower; T9 halves approximate for about middle third of their length, apices narrow, weakly convergent; S9 very narrow for most of apical half, abruptly expanded to basal half, basal margins subparallel, rounded apically; tegmen indistinguishable from that of Operclipygus geometricus (see Fig. 57J), widest in basal half, narrow in most of apical half, with very narrow ‘U’ -shaped medioventral process barely projecting beneath.

Remarks.

While distinctly a member of the Operclipygus hamistrius group, this species is unusual in having a complete 5th dorsal elytral stria (Fig. 58D). This alone will distinguish it from other members of the group.

Etymology.

This species’ name refers to its five complete dorsal elytral striae.