Operclipygus arquus, 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 : 224-226

Operclipygus arquus sp. n. Figs 56A, C57KMap 21

Type locality.

COSTA RICA: Puntarenas: Rincon de Osa [8°41.141'N, 83°31.117'W].

Type material.

Holotype male: "COSTA RICA: Punta. Prov, Rincon de Osa, 50m 8°41.141'N, 83°31.117'W, 23-26-VI-2001,S.&J.Peck, 01-13, ex FIT, CR1P01 005" / SM0520653 KUNHM-ENT" (INBIO). Paratypes (16): COSTA RICA: Puntarenas: 1: Rincon de Osa, 8°41.141'N, 83°31.117'W, 40m, 23-26.vi.2001, FIT, S. & J. Peck (SEMC), 2: 150m, 23-26.vi.2001, FIT, S. & J. Peck (CMNC); 4: Rancho Quemado, Peninsula de Osa, 200m, ix.1992, F. Quesada, (INBIO, FMNH, MSCC, AKTC), 1: 292500, 511000, 200m, v.1991, F. Quesada, (INBIO), 2: v.1992, F. Quesada y G. Varela, (INBIO), 1: x.1992, F. Quesada, (INBIO), 1: xi.1992, M. Segura, (INBIO); 2: Reserva Forestal Golfo Dulce, Est. Agujas, Golfito, Sendero Zamia, 250-350m, 9-12.viii.1998, FIT, A. Azofeifa (INBIO), 2: 250-350m, 11-15.xi.1999, FIT, A. Azofeifa (INBIO).

Other material.

COSTA RICA: Puntarenas: 6: Est. Biol. Las Cruces, San Vito, 17. viii– 12.ix.1982, FIT, B.D. Gill (BDGC, MSCC, AKTC), 3: 1200m, 1-30.vii.1982, FIT, B.D. Gill (BDGC).

Diagnostic description.

Length: 2.03-2.12 mm, width: 1.62-1.75 mm; body rufescent, ovoid, sides rounded; frons depressed at middle, prominent over antennae; frontal stria rounded at sides, broadly interrupted in most, with occasional median fragments present; labrum about 2.5 × as wide as long, very weakly emarginate apically; pronotum with ground punctation fine and sparse with few, ~6-8 coarse lateral punctures, prescutellar region slightly depressed, but lacking distinct fovea; marginal pronotal stria not descending to hypomeron; pronotum with complete lateral submarginal stria close to margin, lateral margin slightly sinuate toward base; anterior submarginal stria detached, forming more or less continuous arc across front of pronotum, reaching back one-fourth to one-third pronotal length; elytra with outer subhumeral stria present in apical half or less, inner subhumeral stria absent, striae 1-4 very fine but complete, 4th often fragmented toward base, 5th stria present in apical third, sutural stria present in apical half; venter with faint microsculpture almost throughout, effaced on swelling of metaventrite; prosternum, mesoventrite, and anterior half of metaventrite depressed (female with depression of metaventrite less distinct); prosternal keel weakly emarginate at base, with complete carinal striae rather widely separated to near apex; prosternal lobe with weak swelling at center of base; 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; 1st abdominal ventrite with two strongly abbreviated lateral striae; propygidium and pygidium both with conspicuous transverse microsculpture; propygidium with sparse, moderately large punctures mainly in basal half; male especially with anterior half of pygidium simply, finely sparsely punctate, females with coarser pygidial punctures; fine apical marginal stria present only in apical half. Male genitalia very similar to those of Operclipygus hamistrius (see Figs 57 A–D), differing as follows: T8 with sides subparallel; S8 shorter, with apices bluntly subacuminate, ventral creases conspicuous; tegmen (Fig. 57K) shorter, widest distinctly basad middle, with sides rounded, not as strongly narrowed to apex; indistinguishable from that of Operclipygus pichinchensis .

Remarks.

This species is fairly easily recognized in this complex by its broadly arcuate anterior submarginal pronotal stria (Fig. 56C).

Etymology.

The name of this species means arc, referring to its curved pronotal stria. It is a noun in apposition.