Orthogonius setosopalpiger Tian, Deuve & Felix

Tian, Mingyi, Deuve, Thierry & Felix, Ron, 2012, Orthogonius species and diversity in Thailand (Coleoptera, Caraboidea, Orthogoniini), a result from the TIGER project, ZooKeys 164, pp. 51-90 : 56-57

Orthogonius setosopalpiger Tian, Deuve & Felix sp. n. Figures 519

Diagnosis.

Small sized, even elytral intervals densely punctuate; ligula small, bisetose at apex, palpiger with a long seta near base; allied to Orthogonius grootaerti Tian & Deuve, 2006 and Orthogonius angkor Tian & Deuve, 2006, but smaller.

Length: 11.0 mm; width: 4.5 mm. Habitus as in Figure 5.

Description.

Dark brown, antennae, palps, lateral expanded margins of pronotum, underside surface except head reddish brown.

Head and pronotum irregularly wrinkled, impunctate, elytra with even intervals densely punctate, odd ones smooth; microsculptural meshes densely isodiametric on elytra, irregular on head and pronotum.

Head moderate, as long as wide, eyes moderate, strongly prominent, frons rather flat, vertex convex, neck well-marked; labrum deeply emarginate at frontal margin, sexsetose, clypeus more or less square, bisetose, base processed in middle; palpi normal; maxillar palpomeres 3 and 4 subequal, labial palpomere 2 slightly longer than palpomere 3; ligula narrow, bisetose at apex; mentum and submentum each with a pair of setae; palpiger short, with a long seta at base; antennae extended to base of elytra, densely pubescent from basal 1/3 of antennomere 4; antennomere 3 as long as antennomere 4.

Pronotum moderately transverse, PW/PL=1.52, widest at about middle; both fore and hind angles broadly rounded; front and hind margins well beaded; lateral expanded margins wide, almost evenly wide throughout, and slightly reflexed; transverse impressions well marked at base, faint at subapex; basal foveae small.

Elytra broad and strongly convex; EL/EW=1.67; sides nearly parallel; widest at about middle, apex roundly truncate, not sinuate before inner angles; base well bordered; shoulders more or less square; striae deep, punctate-striate, intervals convex; even intervals much wider than odd intervals (almost twice as wide, except interval 4, which is less twice as wide as 3) and with coarser punctures extended to apical 1/4 of elytra, odd intervals with a few fine punctures more or less arranged in a row; interval 3 with three setiferous pores; interval 5 with one seta near base; interval 7 narrow but not carinate throughout, with eleven setiferous pores.

Legs stout, fore tibia with outer angle very sharp and strongly protruded, outer margin slightly subserrate; middle tibia not distinctly curved in median portion, moderately dilated; hind tibia elongate, with apical tibial spurs short and sword-like; tarsomere 1 longer than tarsomere 2, tarsomere 3 slightly longer than 4, tarsomere 4 asymmetrically bilobed; hind femur moderately dilated, with four posterior setae. All tarsal claws strongly pectinate.

Prosternal process well bordered at apex, middle coxa with three or four setae; ventrite VII of male complete at apex.

Male genitalia (Figure 19): Elongate, more or less straight, less sinuate ventrally as in other species, hardly bent towards apex; in dorsal view, apical lamella broad at apex, symmetrical, longer than wide.

Female. Unknown.

Remarks.

This species is a member of the Orthogonius grootaerti species group. It differs from Orthogonius grootaerti and Orthogonius angkor by its: (1) smaller sized; (2) aedeagus more elongate and apical lamella longer than in both above species; and (3) hind femur 4-setose posteriorly (6-setose in Orthogonius grootaerti and Orthogonius angkor ).

Type material.

Holotype: male, "Thailand: Phetchabun: Thung Salaeng Luang NP: Gang Wang Nam Yen, 750 m, 16°37.178'N, 100°5.504'E Pan traps, 23-24.v. 2007, Pongpitak Pranee & Sathit leg., T2079", in QSBG.

Etymology.

The name of this new species refers to its setose palpiger.

Distribution.

Thailand. Known only from the type locality.