Operclipygus hirsutipes, 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 : 200-202

Operclipygus hirsutipes sp. n. Figs 54 A–C55A–D, GMap 19

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, 5-11 Jul 1999. AKT#084, C.Carlton & A.Tishechkin"/ “LSAM0013250” (FMNH). Paratypes (5): 1: same data as type (LSAM); 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: 26.vii-4.viii.1999, FIT, A.K. Tishechkin (USFQ); 1: Tiputini Biodiversity Station, 0.6376°S, 76.1499°W, 4-9.vi.2011, FIT, M.S. Caterino & A.K. Tishechkin, DNA Extract MSC-2180 (SBMNH); 1: Parque Nac. Yasuní, Via Maxus at Puente Piraña, 0°39.5'S, 76°26'W, 14-20.vii.2008, FIT, A.K. Tishechkin (AKTC).

Other material.

PERU: Loreto: 1: 1.5km N Teniente Lopez, 2°35.66'S, 76°06.92'W, 210-240m, 20.vii.1993, FIT, R. Leschen (SEMC).

Diagnostic description.

Length: 2.25-2.53 mm, width: 2.03-2.18 mm; body rufopiceous, elongate, sides subparallel to weakly rounded, moderately strongly de pressed; frons broadly depressed at middle, sides of frontal stria divergent, sinuate over antennal bases, complete across front; supraorbital stria complete, strongly arched at middle, connected to sides of frontal stria; labrum short, apically emarginate; left mandible with broad, subacute tooth, right mandible with smaller acute tooth; pronotal disk with vague, linear prescutellar depression, ground punctation fine, with few (~6) coarse punctures in a cluster near sides; anterior pronotal margin weakly, bluntly projecting over head; marginal stria interrupted at middle; lateral submarginal stria complete, curved inward at front nearly to anterior stria; anterior submarginal stria transverse across middle of front, just barely recurved posterad at ends; median pronotal gland openings about halfway back on disk on each side; elytron with two complete epipleural striae, with outer subhumeral stria interrupted at middle, inner subhumeral stria present at middle, apically and especially basally abbreviated, striae 1-3 complete to apex, but distinctly abbreviated from base, 4th stria present in apical half, 5th stria present in apical third, sutural stria present in apical two-thirds, widening and diverging from suture toward front; prosternal keel rounded, projecting at base, carinal striae complete, sinuate at middle, connected in narrow anterior arch; proster nal lobe with marginal stria barely abbreviated at sides; anterior mesoventral margin shallowly emarginate, with complete marginal stria; mesometaventral stria weakly and broadly arched forward to basal third of mesoventral disk, continued at sides by lateral metaventral stria extending toward middle of metacoxa; 1st abdominal ventrite with complete, arcuate inner lateral stria and weak, abbreviated outer; meso- and metatarsomeres with dense brushes of ventral setae, not just rows along ventrolateral margins; propygidium densely and uniformly covered with ovoid, ocellate punctures, separated by less than one-third their diameters; most of pygidial disk with fine, dense ground punctation only, with single row of coarse punctures along basal margin, and with sparsely scattered, inconspicuous, coarser punctures toward apex; marginal pygidial sulcus complete, very deep, crenulate mainly on inner edge.Male genitalia (Figs 55 A–D, G): accessory sclerites absent; T8 with sides narrowed near base, weakly rounded to near apex, apical emargination narrow, basal emargination broadly subangulate, nearly reaching basal membrane attachment line, ventrolateral apodemes most strongly developed near base, narrowed toward apex; S8 short, with sides parallel, apical guides gradually more strongly developed to rounded apices, ventrally halves approximate at base, divergent in apical half; apices of T9 not convergent to apex, apices dorsolaterally flattened, widened and rounded on distal margin, with acute teeth on inner edges; T10 much smaller than opening in T9, with halves separate; S9 with sides more or less parallel, barely narrowed near apex, with apical emargination small, rounded, apical flanges narrow, separate; tegmen short, broad, widest just beyond midpoint, lacking medioventral process; proximal apodemes of median lobe long, three-fourths tegmen length, abruptly narrowed one-third proximad from gonopore; basal piece about one-third tegmen length.

Remarks.

The two species in this group can be separated easily by geography. This species from western Amazonia may be recognized by the generally interrupted outer subhumeral stria, the depressed frons, more conspicuous coarse pygidial punctures(Fig. 54C), and the smaller number of lateral pronotal punctures(Fig. 54B), as well as by genitalic characters, in particular by the apparently absent medioventral process of the tegmen(Fig. 55G). One specimen from Peru differs in a few minor external characters, having complete outer subhumeral striae, and having the lateral and anterior submarginal pronotal striae joined in front, and we exclude it from the type series.

Etymology.

This species’ name refers to its dense tarsal setae.