Siluriformes parallelus, 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 : 356-358

Operclipygus parallelus sp. n. Figs 98 D–E99F–JMap 34

Type locality.

FRENCH GUIANA: Itoupé Table Mountain [3°1.38'N, 53°5.73'W].

Type material.

Holotype male: "GUYANE FR. Mont Tabulaire, Itoupé. 3°1.38'N, 53°5.73'W. 570m. Piège d’interception 24 Mar 2010. SEAG leg."/ "Caterino/Tishechkin Exosternini Voucher EXO-01311" (MNHN). Paratypes (6): 1: same data as type MNHN; 3: same data as type; except as noted: 1: 17.iii.2010, FIT, SEAG (CHND), 2: 800m, 17.iii.2010, FIT, SEAG (CHND); 1: Rés. Natur. des Nouragues, Camp Inselberg, 4°05'N, 52°41'W, 20.viii.2010, FIT, SEAG (AKTC); 1: Belvèdére de Saül, point de vue, 3°1'22"N, 53°12'34"W, 13.v.2011, polytrap, SEAG (MSCC).

Other material.

BRAZIL: Mato Grosso: 1: Cotriguaçu, Fazenda São Nicolau, Matinha, 9°50.3'S, 58°15.05'W, xii.2009, FIT, F.Z. Vaz-de-Mello (CEMT); 1: xii.2010, FIT, F.Z. Vaz-de-Mello (UFPR); 1: Cotriguaçu, Fazenda São Nicolau, 9°48.9'S, 58°17.15'W, 15-18.xii.2010, FIT, F.Z. Vaz-de-Mello & A.F. Oliveira (FMNH); 1: Cotriguaçu, Fazenda São Nicolau, Mata Norte, 9°49.15'S, 58°15.6'W, 8-14.xii.2010, FIT, F.Z. Vaz-de-Mello (CEMT). PERU: Madre de Dios: 1: Amazonas Lodge, N Atalaya, 12°52.2'S, 71°22.6'W, 480m, 10-13.xi.2007, FIT, D. Brzoska (SEMC). SURINAME: Sipaliwini: 1: upper Palumeu, 225m, 2.47700°N, 55.62941°W, CI-RAP Survey camp 1, FIT, 10-16.iii.2012, A.E.Z. Short (MSCC); Para: 1: nr. Overbridge, 5°31'10"N, 55°4'10"W, 10-14.ii.2010, FIT, W. Warner (WBWC), 2: 14-18.ii.2010 (WBWC).

Diagnostic description.

This species is extremely similar to the preceding in external characters, and is only described to the degree to which they differ here: length: 1.78-2.40 mm, width: 1.31-1.62 mm; body strongly elongate-oval; labrum narrowed to front, apical margin carinate and outwardly arcuate; punctiform prescutellar impression fairly evident in most individuals; marginal pronotal bead not strongly widened toward front, submarginal stria more or less parallel to margin; median pronotal gland openings further posterad, somewhat variable, generally 4-6 puncture widths from anterior margin; 5th dorsal elytral stria present in apical third, plus with distinct basal point near scutellum; marginal mesoventral stria very narrowly interrupted or complete at middle; 1st abdominal ventrite with two lateral striae complete, tending to converge toward front. Male genitalia (Figs 99 F–J): accessory sclerites absent; T8 with sides convergent from base to apex, apices broadly rounded, apical emargination narrow, basal emargination narrow, its apex tangential to basal membrane attachment line, ventrolateral apodemes most strongly developed near base, divergent to apex; S8 with sides with sides parallel, apical guides narrow, weakly widened to apex, ventral halves fused for most of their length, narrowly then abruptly divergent apically; T9 parallel-sided in basal two-thirds, convergent to apex, apices widened inward, convergent, apically truncate; T10 weakly sclerotized along midline, margins indistinct; S9 stem narrowest near apex, widened to broad subtruncate base, with distinct apical emargination, apical flanges widely separate; tegmen widest two thirds from base, sides arcuate to base, attenuate to subacute apex, medioventral process weak, almost invisible in dorsal view, narrowly ‘V’ -shaped, embedded in broad, weakly sclerotized ventral expansion; basal piece one-third tegmen length; median lobe about two-thirds tegmen length, with wide gonopore, proximal apodemes strongly differentiated into short, broad, separated bases, and long, well sclerotized extensions reaching toward base of tegmen.

Remarks.

See the preceding species treatment for detailed diagnosis of these two very similar species. We restrict the type series of this species to specimens from French Guiana, though specimens from other localities are consistent in most diagnosticcharacters.

Etymology.

This species’ name refers to its strongly parallel-sided body.