Operclipygus fossipygus (Wenzel, 1944)

Caterino, Michael S. & Tishechkin, Alexey K., 2013, A systematic revision of Operclipygus Marseul (Coleoptera, Histeridae, Exosternini), ZooKeys 271, pp. 1-401 : 242-245

Operclipygus fossipygus (Wenzel, 1944) Figs 6E64 A–B65A–D, GMap 24

Phelisteroides fossipygus Wenzel, 1944: 144; Operclipygus fossipygus : Wenzel (1976: 258).

Type locality.

BRAZIL: Pará: Santarém [2°26'S, 54°42'W].

Type material.

Holotype: "Santarem Brazil Acc. No. 2966" / "Type Phelisteroides fossipygus Wenzel" (CMNH), examined, 2012.

Other material.

BRAZIL: Amapá: 1: Serra do Navio, 0°59'N, 52°00'W, 1-14.v. 1991, FIT (CHND); Mato Grosso: 1: Tangara da Serra, 14°19.05'S, 57°43.9'W, 640m, 22-29.i.2009, FIT, R.S. Silva (CEMT); Pará: 2: Tucuruí, 3°45'S, 49°40'W, iv.1986, FIT (UFPR), 4: vi.1985, FIT (CHND), 1: 16-29.vii.1985, FIT, human dung (CHND); 1: IPEAN, Utinga, Belém, 1°27'S, 48°26'W, v.1985, FIT (CHND), 2: viii.1985, FIT (CHND); 1: Melgaço, Rio Marinaú, 1°51'S, 51°20'W, 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); 2: 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: 3: Yasuní Res. Stn., mid.Rio Tiputini, 0°40.5'S, 76°24'W, 20-29.vi.1999, FIT, C.E. Carlton & V. Moseley (LSAM), 2: 17-23.vi.1999 (LSAM), 1: 22-28.vi.1999 (LSAM), 3: 5-12.vii.1999 (LSAM, FMNH), 1: 7-13.vii.1999 (LSAM), 3: 23-30.vi.1999 (LSAM), 5: 28.vi-5.vii.1999 (LSAM), 3: 4-17.vii.1999 (LSAM), 2: 17-26.vii.1999 (LSAM); 1: 5-10.ix.1999, FIT, primary forest, E.G. Riley (TAMU); 3: Parque Nac. Yasuní, Via Maxus at Puente Piraña, 0°39.5'S, 76°26'W, 14-20.vii.2008, FIT, A.K. Tishechkin (AKTC), 1: 20-24.vii.2008, FIT, A.K. Tishechkin (AKTC); 1: Tiputini Biodiversity Station, 30.vii.2008, Day FIT, A.K. Tishechkin, DNA Extract MSC-1896 (AKTC); 3: Tiputini Biodiversity Station, 0.6376°S, 76.1499°W, 4-9.vi.2011, FIT, M.S. Caterino & A.K. Tishechkin, DNA Extracts MSC-2289, MSC-2175, MSC-2291 (SBMNH, MSCC, USFQ); 2: Tiputini Biodiversity Station, 0°38'0"S, 76°9'0"W, 220m, 5-25.ix.2000, D.J. Inward & K.A. Jackson (BMNH). FRENCH GUIANA: 1: Régina, Réserve des Nouragues, 4°2.27'N, 52°40.35'W, 28.i.2010, FIT, SEAG (CHND); 1: Régina, Réserve des Nouragues, 4°2.27'N, 52°40.35'W, 19.ii.2010, FIT, SEAG (CHND), 2: 3.xi.2009, FIT, SEAG (CHND); 1: Roura, 27.4km SSE, 4°44'20"N, 52°13'25"W, 280m, 10.vi.1997, FIT, J. Ashe, R. Brooks (SEMC); 1: Belvèdére de Saül, 3°1'22"N, 53°12'34"W, 30.xi.2010, Window trap, SEAG (MNHN). PERU: Loreto: 1: Campamento San Jacinto, 2°18.75'S, 75°51.77'W, 175-215m, 12.vii.1993, FIT, R. Leschen (SEMC); 1: 1.5km N Teniente Lopez, 2°35.66'S, 76°06.92'W, 210-240m, 22.vii.1993, FIT, R. Leschen (SEMC); Madre de Dios: 1: Manu National Park, Zona res., Rio Manu, Cocha Juarez, trail nr. Manu Lodge, 18-24.ix.1991, FIT, A. Hartman (FMNH); 4: Tambopata, Reserva Cuzco Amazonico, 15km NE Pto. Maldonado, 12°33'S, 69°03'W, 200m, 22.vi.1989, FIT, J. Ashe & R. Leschen (SEMC), 1: 28.vi.1989, FIT, D. Silva, R.A. Leschen (SEMC), 1: 24.vi.1989, FIT, J. Ashe & R. Leschen (SEMC). SURINAME: Saramacca: 1: West Suriname Road, 108km WSW Zanderij Airport, 5°13'37"N, 55°52'54"W, 30m, 10-14.vi.1999, FIT, Z. Falin, B. DeDijn (SEMC); Sipaliwini: 5: CI-RAP Surv. Camp 2: Sipaliwini River, 2°10.521'N, 56°47.244'W, 210m, 27.viii-1.ix.2010, FIT, T. Larsen & A.E.Z. Short (SEMC); 1: CI-RAP Surv. Camp 3: Wehepai SE Kwamala, 2°21.776'N, 56°41.861'W, 237m, 3-7.ix.2010, FIT, T. Larsen & A.E.Z. Short (SEMC).

Diagnostic description.

Length: 1.87-2.25 mm, width: 1.68-2.00 mm; body rufopiceous, ovoid; frons depressed at middle; frontal stria rounded, weakly divergent at sides, generally interrupted over antennal bases, strongly rounded anterad at middle; supraorbital stria weak, fragmented, detached from sides of frontal stria; epistoma convex; labrum about twice as wide as long, asymmetrically emarginate apically; left mandible untoothed, right mandible with small acute basal tooth; pronotum broadly depressed at base, but lacking distinct prescutellar impression, with fine, sparse ground punctation, with few or no larger lateral punctures; anterior pronotal margin distinctly projecting at middle; marginal pronotal stria broadly interrupted behind head; submarginal pronotal stria continuous, complete along lateral and anterior margins; median pronotal gland openings simple, about two-thirds pronotal length from anterior margin; elytra with two complete epipleural striae, outer subhumeral stria complete or interrupted at middle, inner subhumeral stria present in apical half, often shortened at apex, dorsal striae 1-3 complete, 4th and 5th striae similar in length, present in about apical half, sutural stria present in apical three-fourths; prosternal keel weakly projecting at base, carinal striae generally complete, free or united anteriorly; anterior mesoventral margin shallowly emarginate, marginal stria complete; mesometaventral stria weakly arched forward at middle one-third, sinuate near mesocoxa, continued by lateral metaventral stria which curves laterad toward outer corner of metacoxa; 1st abdominal ventrite with two abbreviated lateral striae; postmetacoxal fovea not evident; propygidium with large punctures confined to middle and along basal margin, with fine, dense ground punctation elsewhere; pygidium with fine, dense ground punctation, lacking coarser punctures except along extreme basal margin; marginal pygidial sulcus deep, ending in very large, transversely elongate basal foveae. Male genitalia (Figs 65 A–D, G): accessory sclerites absent; T8 more or less parallel-sided, slightly convergent apically, with narrow apical emargination, basal emargination evenly arcuate, basal membrane attachment line distad basal emargination by about one-third its depth, ventrolateral apodemes most strongly developed at their bases, narrowed apically; S8 parallel-sided, with apical guides narrow, evenly developed over most of length, with halves fused; T9 parallel sided in basal two-thirds, convergent to broad, subtruncate apices; T10 with halves finely divided; S9 rather short and broad, sclerotized along midline and along distal edges, with base widened, truncate to weakly emarginate, apical emargination narrow, apical flanges separate; tegmen widest near middle, narrowed to base and apex, strongly curved dorsoventrally, with medioventral process composed of inwardly projecting lateral flanges that are not fused along midline, together forming strong ventral projection; median lobe about three-fourths tegmen length, with proximal apodemes strongly differentiated into thick and thinner proximal portions; basal piece about one-third tegmen length.

Remarks.

This is a highly distinctive species, easily recognized by the deep, basal pygidial foveae (Fig. 64B), the dense ground punctation on the sides of the propygidium, and the projecting anterior pronotal margin (Fig. 64A). There is some variation in genitalic structure, exhibited in an individual from Amazonian Peru, especially, in which the spiculum gastrale (S9) is sclerotized along the midline rather than along the margins. However, the unusual form of the aedeagus and its medioventral process is identical with typical Operclipygus fossipygus .