Operclipygus impressistrius, 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 : 188-189

Operclipygus impressistrius sp. n. Fig. 50AMap 18

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 #M1, 18-20 Jun 1999. AKT#008, C.Carlton & A.Tishechkin"/ “LSAM0013188” / " Operclipygus sp #6, Hist 128, Yasuní NP Inventory A.K.Tishechkin det 2010" (FMNH). Paratypes (61): 1: same data as type; same data as type, except as noted: 4: 20-26.vii.1999 (LSAM), 6: 12-20.vii.1999 (LSAM), 4: 5-12.vii.1999 (LSAM), 5: 22-28.v.1999 (LSAM), 6: 26.vii-4.viii.1999 (LSAM, CHND), 6: 28.vi-5.vii.1999 (LSAM, MSCC, AKTC), 1: 20-29.v.1999, C.E. Carlton & V. Moseley (LSAM), 3: 26.vii.1999, Couratari guianensis Aublet flowerfall (LSAM), 1: 22.vii.1999, Sterculia apetala (Jaquin) Karsten flowerfall (LSAM); 6: 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: Yasuní Res. Stn., 00°40'28"S, 76°38'50"W, 215m, 5-10.ix.1999, FIT, primary forest, E.G. Riley (TAMU); 1: Tiputini Biodiversity Station, 0.6376°S, 76.1499°W, 4-9.vi.2011, FIT, M.S. Caterino & A.K. Tishechkin, DNA Extract MSC-2176 (SBMNH), 3: 2-9.vi.2011, FIT, M.S. Caterino & A.K. Tishechkin (USFQ, SBMNH); 1: 0°38'0"S, 76°9'0"W, 220m, 5-25.ix.2000, D.J. Inward & K.A. Jackson (BMNH). COLOMBIA: Vaupés: 3: Parque Nac. Mosiro-Itajura ( Caparú), Centro Ambiental, 1°04'S, 69°31'W, 60m, 20-30.i.2003, FIT, D. Arias & M. Sharkey (IAVH). PERU: Loreto: 1: 1.5km N Teniente Lopez, 2°35.66'S, 76°06.92'W, 210-240m, 23.vii.1993, flowerfall, R. Leschen (SEMC).,2: 18.vii.1993, FIT, R. Leschen (SEMC); 2: Teniente Lopez, 2°35.66'S, 76°06.92'W, 210-240m, 25.vii.1993, flowerfall berlese, R. Leschen (SEMC); 1: 68km SW Iquitos to Nauta, Rio Itaya, 4°11'S, 73°26'W, 110m, 1-3.iii.2008, A.V. Petrov (MUSM); 1: km 63, rd. Iquitos - Nauta, Rio Itaya, 4°15.205'S, 73°26.074'W, 140m, 10-14.ii.2010, A.V. Petrov (AKTC); Madre de Dios: 1: Manu National Park, Pantiacolla Lodge, Alto Madre de Dios R., 12°39.3'S, 71°13.9'W, 420m, 14-19.xi.2007, FIT, D. Brzoska (SEMC).

Diagnostic description.

This species is generally similar to Operclipygus distinctus , being piceous, convex, broadly rounded, and is only described to the extent that they differ: length: 1.81-2.31 mm, width: 1.53-1.97 mm; pronotal disk with base strongly flattened and weakly plicate, with ~12 faintly impressed lateral punctures; submarginal pronotal stria not markedly displaced behind median pronotal gland openings; elytral striae 1-5 deeply and more broadly impressed at apices, with intervals strongly convex; outer subhumeral stria interrupted at middle, with basal fragment short, not reaching base, striae 1-3 complete, somewhat crowded to side, 4th stria present in apical two-thirds, 5th stria present in apical third, sutural stria present in apical two-thirds; prosternal keel broad, flat, weakly emarginate at base, carinal striae well separated, weakly convergent to broad anterior arch; mesometaventral stria strongly arched forward to near mesoventral margin, frequently but not always interrupting marginal mesoventral stria; 1st abdominal ventrite with inner lateral stria only, curving mediad toward apex; propygidium with shallow, elongate, ovoid punctures separated by about half their diameters; pygidium with fine, dense but shallow ground punctation, very faint coarser punctures interspersed; marginal pygidial sulcus fine, complete. Male genitalia more or less indistinguishable from those of Operclipygus distinctus (see Figs 48 A–D, L), except S8 longer, sides more parallel, apical guides more evenly and strongly developed along length; tegmen identical.

Remarks.

In addition to its strongly rounded, convex body form(Fig. 50A), common to several species in this group, this species is distinguished by the elytral striae which are strongly impressed apically, the weakly plicate pronotal base, and the interrupted outer subhumeral stria.

Etymology.

The name of this species refers to its strongly impressed elytral striae.