Operclipygus angustisternus (Wenzel, 1944)

Caterino, Michael S. & Tishechkin, Alexey K., 2013, A systematic revision of Operclipygus Marseul (Coleoptera, Histeridae, Exosternini), ZooKeys 271, pp. 1-401 : 368-372

Operclipygus angustisternus (Wenzel, 1944) Figs 105 A–C106A–EMap 35

Phelisteroides angustisternus Wenzel, 1944: 142; Operclipygus angustisternus : Wenzel 1976: 257.

Type locality.

Not specified beyond Pará State, Brazil.

Type material.

Holotype male, slightly teneral: “Para” / “Brazil” / “June” / "Type Phelisteroides angustisternus Wenzel" (FMNH), examined 2006.

Other material.

BRAZIL: Amapá: 2: Serra do Navio, 0°59'N, 52°00'W, 1-14.v.1991, FIT (CHND); Mato Grosso: 1: Sinop, 11°49'S, 55°29'W, 12-24.vi.1985, FIT (CHND); Pará: 1: Tucuruí, 3°45'S, 49°40'W, iv.1986, FIT (CHND); 1: v.1986, FIT (CHND), 1: 20.v-15.vi.1987, FIT (CHND); 2: IPEAN, Belém, Ut inga, 1°27'S, 48°26'W, ix.1984, FIT (CHND), 1: ix.1985, FIT (CHND); 1: Melgaço, Rio Marinaú, 1°51.5'S, 51°20'W, 29.x-13.xi.1993, FIT (CHND), 1: 31.x-13.xi.1993, FIT (CHND). COLOMBIA: Vaupés: 1: Est. Biol. Caparú, Rio Apoporis, 1.1°S, 69.5°W, 27.ix-1.xii.1995, FIT, Black-water terrace forest on sandy soils, B.D. Gill (BDGC); 1: Parque Nac. Mosiro-Itajura ( Caparú), Centro Ambiental, 1°04'S, 69°31'W, 60m, 20-30.i.2003, FIT, D. Arias & M. Sharkey (IAVH). ECUADOR: Orellana: 1: Yasuní Res. Stn., mid.Rio Tiputini, 0°40.5'S, 76°24'W, 28.vi-5.vii.1999, FIT, C.E. Carlton & A.K. Tishechkin (LSAM), 1: 12-20.vii.1999, FIT, A.K. Tishechkin (LSAM), 1: 5-11.vii.1999 (LSAM), 1: 20-23.vi.1999 (LSAM), 1: 23-30.vi.1999LSAM); 1: Yasuní Res. Stn., 00°40'28"S, 76°38'50"W, 215m, 5-10.ix.1999, FIT, primary forest, E.G. Riley (TAMU); 1: Parque Nac. Yasuní, Via Maxus at Puente Piraña, 1°39.5'S, 76°26'W, 14-20.vii.2008, FIT, A.K. Tishechkin (AKTC); 1: Payamino Research Station, 0°29'36.01"S, 77°17'29.15"W, 300m, 30.vii-12. viii.2007, FIT, tropical rainforest, CPDT Gillett (BMNH); 1: Tiputini Biodiversity Station, 0°38.2'S, 76°8.9'W, 27-31.vii.2008, FIT, A.K. Tishechkin (AKTC); 1: Tiputini Biodiversity Station, 0°38'0"S, 76°9'0"W, 220m, 5-25.ix.2000, D.J. Inward & K.A. Jackson (BMNH). PERU: Junín: 1: 11km NE Puerto Ocopa, Los Olivos, 11°7.00'S, 74°15.52'W, 1200m, 30-31.iii.2009, Window trap, A.V. Petrov (AKTC); 1: 7.5km NE Puerto Ocopa, Cananeden, 11°4.9'S, 74°16.1'W, 1180m, 6.ii.2008, A.V. Petrov (AKTC); 2: ~16km NW Satipo, Rio Venado, 11°11.677'S, 74°46.137'W, 1150m, 3-8.iii.2010, A.V. Petrov (AKTC, MUSM); Loreto: 1: 68km SW Iquitos to Nauta, Rio Itaya, 4°11'S, 73°26'W, 110m, 28.ii.2008, A.V. Petrov (AKTC); 1: km 63, rd. Iquitos - Nauta, Rio Itaya, 4°15.205'S, 73°26.074'W, 140m, 8-17.i.2010, A.V. Petrov (MUSM). SURINAME: Para: 2: nr. Overbridge River Resort, 5°31.8'N, 55°3.5'W, 13-15.ii.2010, FIT, C. Gillet, P. Skelley, W. Warner (FSCA), 5: 15-18.ii.2010, FIT, C. Gillet, P. Skelley, W. Warner (FSCA); 2: near Overbridge, 05°31'10"N, 55°04'10"W, 10-14.ii.2010, FIT, W.B. Warner (WBWC), 1: 14-18.ii.2010 (WBWC).

Diagnostic description.

Length: 1.68-2.09 mm, width: 1.50-1.87 mm; body rufescent, elongate oval, sides weakly rounded; frons strongly but narrowly depressed at middle; frontal stria with sides divergent, weakly rounded, strongly sinuate over antennal bases, arcuate anterad; supraorbital stria finely impressed, but strongly arcuate dorsad onto vertex, weakly connected with sides of frontal stria; epistoma flat, weakly emarginate at apex; labrum about 3 × as wide as long, weakly emarginate, asymmetrical, left side more strongly produced than right, weak projection beneath; left mandible untoothed, right with small, acute basal tooth; pronotum with sides rounded, rather strongly convergent to front, with anterior margin markedly produced over head, lacking prescutellar impression; pronotal disk with fine, sparse ground punctation, with at least a few (up to ~12) coarser punctures at sides; lateral submarginal pronotal stria complete along side, curved inward anteriorly, nearly meeting anterior submarginal stria, which is weakly arcuate, barely turned posterad at sides; median pronotal gland openings annulate, situated behind ends of recurved anterior stria, about two-thirds pronotal length from anterior margin; elytra with two complete epipleural striae, outer subhumeral stria present in posterior one-third to one-half, inner subhumeral stria absent, elytron swollen in subhumeral region, dorsal striae 1-3 complete, 4th stria present in apical two-thirds, 5th stria present in apical third, sutural present in apical three-fourths; prosternal keel rounded, projecting posterad, carinal striae variably shortened, meeting about one-third from presternal suture, anterior one-third of keel narrow; prosternal lobe rather short, marginal stria abbreviated at sides; anterior mesoventral margin emarginate, marginal stria complete; mesometaventral stria weakly arched forward at middle, sinuate at sides, continued by lateral metaventral stria posterad toward inner third of metacoxa; 1st abdominal ventrite with three lateral striae, all three usually abbreviated posteriorly, innermost extending mediad for some distance along anterior margin of ventrite, nearly continuously in some individuals, outermost shortest of the three, ending at an annulate postmetacoxal fovea; sides of propygidium and entire pygidium with dense, fine ground punctation; propygidium with irregular, moderately large punctures at middle, separated by about one-fourth their diameters; pygidium with few barely larger punctures standing out from ground punctation; marginal pygidial stria narrow but deeply impressed apically, becoming shallower, as an interconnected series of punctures toward base. Male genitalia (Figs 106 A–E): accessory sclerites absent; T8 with sides subparallel in basal three-fourths, angulate to short, narrowly but shallowly emarginate apex, basal emargination deep, broad, reaching basal membrane attachment line, ventrolateral apodemes most strongly developed at base, narrowing toward apex; S8 with sides subparallel, apical guides narrowing from base to narrowly rounded apex; T9 with sides rounded, with narrow, convergent apices; T10 with halves separate; S9 with stem desclerotized along midline, widest basally, base truncate, with equilateral apical emargination, apical flanges separate; tegmen parallel-sided in basal three-fourths, narrowed to blunt apex, lacking medioventral process; basal piece about one-fourth tegmen length; median lobe narrow, about one-half tegmen length.

Remarks.

The presence of dense ground punctation on the sides of the propygidium (Fig. 105C) is restricted to only a few species of Operclipygus . Operclipygus angustisternus is further distinguished by the strongly sinuate frontal and strongly arched supraorbital striae, the outwardly projecting anterior pronotal margin (Fig. 105A), and by the presence of three lateral striae on the 1st abdominal ventrite (Fig. 105B).