Operclipygus impuncticollis (Hinton, 1935)

Caterino, Michael S. & Tishechkin, Alexey K., 2013, A systematic revision of Operclipygus Marseul (Coleoptera, Histeridae, Exosternini), ZooKeys 271, pp. 1-401 : 60-63

Operclipygus impuncticollis (Hinton, 1935) Figs 15B16 A–DMap 5

Phelister impuncticollis Hinton, 1935a: 590; Operclipygus impuncticollis : Wenzel 1976: 259.

Type locality.

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

Type material.

Lectotype, here designated, probably male: “Santarem” / “Type” / " Phelister impuncticollis type. Hntn." / "G. Lewis Coll. B.M.1926-369" / "LECTOTYPE Phelister impuncticollis Hinton, 1935, M.S.Caterino & A.K.Tishechkin des. 2010" (BMNH). This species was described from an unspecified number of specimens, and the lectotype designation fixes primary type status on the only known original specimen.

Other material.

BRAZIL: Amapá: 1: Serra do Navio, 0°59'N, 52°00'W, 1.v.1991, 14.v.1991, FIT (CHND). Mato Grosso: 1: Cotriguaçu, Fazenda São Nicolau, 9°48.9'S, 58°17.15'W, 15.xii.2010, FIT, F.Z. Vaz-de-Mello & A.F. Oliveira (CEMT). Pará: 3: IPEAN, Utinga, Belém, 1°27'S, 48°26'W, ix.1984, FIT (CHND), 1: v.1985, FIT (CHND), 7: vii.1985, FIT (CHND), 2: viii.1985, FIT (CHND), 1: x.1985, FIT (CHND). 1: Tucuruí, 3°45'S, 49°40'W, v.1986, FIT (CHND), 1: 10-29.vii.1985, FIT (CHND), 1: 9-17.xii.1985, FIT (CHND). 1: Ilha Arapiuns, 2°24'S, 54°57'W, 30-31.xii.2008, FIT (CEMT). ECUADOR: Orellana: 1: Univ. Catolica Res. Sta., vii.1996, FIT, A. Cognato (MSCC). 1: Yasuní Res. Stn., mid.Rio Tiputini, 0°40.5'S, 76°24'W, 4.viii.1999, palm fruit/flower fall, A.K. Tishechkin (LSAM), same locality & collector except as noted: 4: 28. vi– 5.vii.1999, FIT (LSAM), 1: 22-28.vi.1999, FIT (LSAM), 1: 12-20.vii.1999, FIT (LSAM), 2: 26.vii-4.viii.1999, FIT (LSAM), 1: 18-23.vi.1999, FIT (LSAM), 3: 20-26.vii.1999, FIT (LSAM, USFQ), 3: 23-30.vi.1999, FIT (LSAM), 4: 17-23.vi.1999, FIT (AKTC, LSAM), 1: 5-11.vii.1999, FIT (LSAM), 1: 11-18.vii.1999, FIT (LSAM), 1: 5-10.ix.1999, FIT, Primary forest, E.G. Riley (TAMU), 1: Berlese, 12.vii.2008, C.E. Carlton, DNA Extract MSC-1904 (LSAM); 4: Tiputini Biodiversity Station, 0.6376°S, 76.1499°W, 4-9.vi.2011, FIT, M.S. Caterino & A.K. Tishechkin (SBMNH, USFQ, MSCC), DNA Extract MSC-2117; 2: Tiputini Biodiversity Station, 0°38'0"S, 76°9'0"W, 220m, 5-25.ix.2000, D.J. Inward & K.A. Jackson (BMNH). 2: P.N. Yasuní, Via Maxus at Puente Piraña, 0°39.5'S, 76°26'W, 14-20.vii.2008, FIT, A.K. Tishechkin (AKTC). FRENCH GUIANA: 1: Régina, Réserve des Nouragues, 4°2.27'N, 52°40.35'W, 28.i.2010, FIT, SEAG (CHND). 1: Roura, 8.4km SSE, 4°40'41"N, 52°13'25"W, 200m, 29. v– 10.vi.1997, FIT, J. Ashe & R. Brooks (CMNC). 1: Mont tabulaire Itoupé, 3°1.82'N, 53°6.40'W, 400m, 17.iii.2010, FIT, SEAG (CHND), 2: 17.iii.2010 (CHND), 1: 24.iii.2010 (CHND). GUYANA: Mazaruni-Potaro: 1, Takutu Mountains, 6°15'N, 58°55'W, 10-19.xii.1983, Window trap, montane rainforest near logging area, P.D. Perkins & W.E. Steiner (USNM), 2: same data except 8.xii.1983 (USNM). Region 8: 1: Iwokrama Forest, 26km SW Kurupukari, Iwokrama Mt., 4°20'2"N, 58°47'18"W, 300m, 23-25.v.2001, FIT, R. Brooks & Z. Falin (SEMC). PERU: Loreto: 1: Teniente Lopez, 2°35.66'S, 76°06.92'W, 210-240m, 25.vii.1993, flowerfall berlese, R. Leschen (SEMC), same locality & collector: 1: 21.vii.1993, palm fruit fall (SEMC), 1: 20.vii.1993, FIT (SEMC), 1: 26.vii.1993, FIT (SEMC), 1: 11.vii.1993, FIT (SEMC). SURINAME: Sipaliwini: 1: CI-RAP Surv. Camp 1 on Kutari River, 2°10.521'N, 56°47.244'W, 228m, 19-24.viii.2010, FIT, T. Larsen & A.E.Z. Short (SEMC).

Diagnostic description.

Length: 1.62-2.15 mm, width: 1.44-1.84 mm; body rufescent, rounded, moderately convex; frons flat, very finely and sparsely punctate; frontal stria interrupted over antennal bases, rarely complete; epistoma notably convex near apex, weakly emarginate apically; labrum short, almost three times as wide as long; left mandible untoothed, right with acute basal tooth; pronotum with sides fairly straight, convergent in basal two-thirds, curved inward to anterior angles; pronotal disk (and elytral bases) flattened near scutellum, with faint, linear prescutellar impression, pronotal ground punctation very fine, sparse, some individuals with <5 coarser punctures at sides; lateral marginal pronotal stria broadly interrupted behind head; lateral submarginal stria complete, incurved anteriorly, ending freely behind eye; anterior submarginal stria close to anterior margin, crenulate, barely or not recurved behind eye; median pronotal gland openings situated beyond apices of recurved anterior stria, about one-fourth pronotal length from anterior margin; elytra with single complete, strongly sinuate epipleural stria, outer subhumeral stria present in apical third, inner subhumeral absent, striae 1-3 complete, 4th present in apical half, 5th stria present in about apical third, sutural stria present in apical two-thirds, all elytral striae, especially sutural, markedly wider anterad; prosternal keel with base broad, weakly, arcuately produced, carinal striae slightly abbreviated in front, united anteriorly; prosternal lobe rather short, marginal stria abbreviated at sides; anterior mesoventral margin broadly, shallowly emarginate, marginal mesoventral stria complete; mesometaventral stria arched forward at middle, sinuate near mesocoxa, extending obliquely toward outer corner of metacoxa, slightly abbreviated at apex; metaventral disk finely punctate; 1st abdominal ventrite with inner lateral stria displaced mediad, abbreviated, with broad gap between it and more nearly complete outer lateral stria; propygidium relatively long, about two-thirds pygidium length along midline, with medium punctures in middle part of disk, separated by about their diameters; pygidium with very dense, fine ground punctation and a few, slightly coarser punctures interspersed; apical sul cus deeply impressed, crenulate along inner margin, more strongly impressed towards sides, with narrow flat marginal bead.Male genitalia (Fig. 16 A–D): accessory sclerites present; T8 with sides straight, weakly convergent in basal two-thirds, angled inward to narrow apex, desclerotized at angle, basal emargination shallowly triangular, basal apodemes obliquely truncate, basal membrane attachment line distad apex of basal emargination by almost its length, ventrolateral apodemes fairly narrowly rounded, not meeting beneath; S8 elongate, weakly narrowed to apex, apical guides evenly and narrowly developed throughout length, apices rounded, ventral halves approximate (possibly fused) at base, divergent and well separated in apical three-fourths; T9 with basal apodemes parallel-sided, sides slightly widened at basal third, convergent in apical two-thirds; apices narrow, subacute, convergent; T10 with halves separate; S9 with stem narrow, weakly widened to narrowly rounded base, head rather large, with lateral flanges strongly elevated, weakly convergent, apical margin narrowly arcuate, but lacking median emargination, apical flange well developed, continuous; tegmen narrow, elongate, with sides weakly rounded, widest in basal third, narrowing to apex, apex weakly hooked ventrad; medioventral process narrowly ‘U’ -shaped, weakly projecting beneath about one-fourth from base; basal piece slightly over one-third tegmen length; median lobe about one-third tegmen length with basal apodemes barely separate, divergent at tips, filamentous part inconspicuous.

Remarks.

The nominate species of the Operclipygus impuncticollis group is distinguished from the other two by its usually interrupted frontal stria, its lack of coarse lateral pronotal punctures, and its marginal pygidial sulcus which appears as a series of very deep, coarse punctures all the way to the basal corners (Fig. 15B).