Operclipygus callifrons, 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 : 129-131

Operclipygus callifrons sp. n. Figs 35 A–B 3Map 12

Type locality.

ECUADOR: Orellana: Yasuní Research Station [0°40.5'S, 76°24'W].

Type material.

Holotype male: "Ecuador: Napo, mid.Rio Tiputini, Yasuní Res. Stn. 0°40.5'S, 76°24'W, FIT #1, 23-30 Jun 1999. AKT#032, C.Carlton & A.Tishechkin"/ “LSAM0013254” (FMNH). Paratypes (42): ECUADOR: Orellana: 5: Yasuní Res. Stn., mid.Rio Tiputini, 0°40.5'S, 76°24'W, 17-23.vi.1999, FIT, C.E. Carlton & A.K. Tishechkin (LSAM, MSCC, AKTC), 5: 18-23.vi.1999 (LSAM, CHND), 3: 20-29.vi.1999 (LSAM), 7: 23-28.vi.1999 (LSAM), 1: 28. vi– 5. vii.1999 (LSAM), 2: 4-17.vii.1999 (LSAM), 5: 5-11.vii.1999 (LSAM), 1: 20-26.vii.1999 (LSAM), 1: 23. vii– 4.viii.1999 (USFQ), 1: 25. vii– 3.viii.1999 (LSAM), 1: 26. vii– 4.viii.1999 (LSAM), 1: 215m, 5-10.ix.1999, FIT, primary forest, E.G. Riley (LSAM); 5: 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: Tiputini Biodiversity Station, 0.6376°S, 76.1499°W, 4-9.vi.2011, FIT, M.S. Caterino & A.K. Tishechkin, DNA Extract MSC-2191 (SBMNH), 1: 220m, 5-25.ix.2000, D.J. Inward & K.A. Jackson (BMNH); Sucumbíos: 1: Sacha Lodge, 0°28'14"S, 76°27'35"W, 270m, 21-24.iii.1999, FIT, R. Brooks (SEMC).

Other material.

BRAZIL: Pará: 1: Tucuruí, 3°45'S, 49°40'W, iv.1986, FIT (CHND); Mato Grosso: 1: Cotriguaçu, Fazenda São Nicolau, Matinha, 9°50.3'S, 58°15.05'W, x.2009, FIT, F.Z. Vaz-de-Mello, 1: xii.2010, FIT, F.Z. Vaz-de-Mello (CEMT). PERU: Junín: 2: 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: 4km NE Puerto Ocopa, Santa Cruz, 11°3.8'S, 74°17.0'W, 1150m, 19.ii.2006, 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 (MUSM), 1: 11.i.2007, A.V. Petrov (MUSM); 2: Loreto: Campamento San Jacinto, 2°18.75'S, 75°51.77'W, 175-215m, 3.vii.1993, FIT, R. Leschen (SEMC), 2: 5.vii.1993, FIT, R. Leschen (SEMC); 1: 68km SW Iquitos to Nauta, Rio Itaya, 4°11'S, 73°26'W, 110m, 4.ii.2007, A.V. Petrov (AKTC), 1: 10.ii.2007, A.V. Petrov (MUSM).

Diagnostic description.

Length: 1.44-1.68 mm, width: 1.12-1.31 mm; frontal stria complete, rather high on the frons, with broad bead above antennal insertions; antennal bosses prominent; supraorbital stria complete, continuous with sides of frontal stria; epistoma weakly depressed, shallowly emarginate along anterior margin, coplanar with labrum; prescutellar impression linear, about 1.5 × length of scutellum; lateral marginal pronotal stria present only present in anterior third of pronotum, subequal in length to recurved arms of anterior submarginal stria; pronotal disk with ~12 coarse lateral punctures; median pronotal gland openings about 6 puncture widths from anterior margin; elytra with outer subhumeral stria prsent in apical half, striae 1-4 complete (4th occasionally slightly abbreviated at base), 5th stria present in apical half, sutural stria present in apical three-fourths; prosternal keel produced posteriorly, carinal striae short anteriorly, tending to be faint to obsolete posteriorly; marginal mesoventral stria complete; mesometaventral stria narrowly arched forward at middle nearly to marginal mesoventral stria; lateral metaventral stria extended toward outer fourth of metacoxa, occasionally bent laterad at apex; propygidium uniformly covered with small round punctures separated by their diameters; pygidium with ground punctation moderately dense, coarser punctures irregularly but conspicuously interspersed; marginal pygidial sulcus fine, deep, crenulate along inner edge, relatively smooth on outer edge. Male genitalia more or less indistinguishable from those of Operclipygus subterraneus (see Figs 36 F–H); T8 slightly shorter, with sides slightly more strongly convergent, basal emargination narrower.

Remarks.

This species can usually be recognized by its shortened lateral submarginal pronotal stria, complete frontal stria situated relatively high on the frons (Fig. 35 A), depressed epistoma coplanar with labrum, prosternal striae which tend to be obsolete basally, and pygidial sulcus which is narrowly rounded to subangulate around the apical margin (Fig. 35B). Due to the broad distribution and some intraspecific variation we restrict the type series to those specimens from eastern Ecuador.

Etymology.

This species’ name refers to the frontal calli, or prominent bosses above the antennal bases.