Orthogonius morvanianus, Tian, Mingyi & Deuve, Thierry, 2016

Tian, Mingyi & Deuve, Thierry, 2016, A review of the sarawakensis species group of the ground beetle genus Orthogonius MacLeay, 1825 (Coleoptera, Carabidae, Orthogoniini), ZooKeys 594, pp. 99-110 : 103

Taxon classification Animalia Coleoptera Carabidae

Orthogonius morvanianus sp. n. Figs 1A, 4 A–C

Holotype.

Male, "Thailand South, near Khao Sok NP, 3-6. II. 1997, A. Kudrna lgt", in CPM.

Length: 14.0 mm; width: 5.5 mm. Habitus as in Fig. 4A.

Description.

Yellowish brown, with head dark brown, the 2 nd– 11th antennomeres, disc of pronotum, tibiae and tarsi of legs brown; surface glabrous, impuctate, head and pronotum finely striate, the 3rd, 5th and 7th elytral intervals each with a few tiny sparse punctures; surface moderately shiny; microsculptural engraved meshes densely isodiametric on the surface of head, pronotum and elytra; body rather flat.

Head stout, as long as wide; eyes very large and prominent; frons flat, vertex slightly convex, smooth; frontal impressions very small, foveate; clypeus bisetose, rather smooth near base; labrum 6-setose, evidently emarginate at apical margin; ligula very small and narrow, bisetose at apex; palps slender or elongate, subcylindrical, normally setose; palpiger asetose, mentum edentate, mentum and submentum each with one pair of setae, mental ones much shorter; antennae slender and long, reaching 1/4 of elytra from base, pubescent from apical 2/3 of the 4th antennomere; the 3rd antennomere as long as the 4th, both shorter than the 1st; the 1 st– 3rd antennomeres glabrous; evidently expanded laterally in the 4th and 5th antennomere; the 1st antennomere 1.6 times as long as the 2nd.

Pronotum strongly transverse, PW/PL = 1.78, sides evenly rounded, widest at about middle; both basal and fore margins beaded; lateral expanded margins well defined, subequal wide throughout, strongly reflexed, smooth though with punctate-like structures; both fore and hind angles rounded off; disc moderately convex, fore transversal impression evident, while hind one well-marked, joining basal foveae and the lateral expanded margins.

Elytra elongate ovate, much longer than wide, EL/EW = 1.63, moderately convex, apex broadly truncate, without outer apical angle, inner apical angle broadly obtuse; basal borders well-bordered; sides more or less paralleled in middle portion; striae quite deep; intervals nearly flat, subequal in width; the 3rd interval with three setiferous pores, anterior one close to the 3rd stria, while other two, median and posterior ones, on median portion of the interval; the 7th interval not carinated and without setae throughout.

Legs moderately developed; hind femur long and elongate, with 2 setae posteriorly; middle and hind coxae smooth and glabrous; fore tibia deeply sinuate at apical margin, outer angle sharp, outer margin distinctly serrate; middle tibia slender, not dilated medially in male; hind tibia slender, apex slightly dilated, apical spurs very long and sharp, the 1st tarsomere slightly longer than the 2nd, the 3rd tarsomere about 1.2 times longer than the 4th which is bilobed at apex, with outer lobe slightly shorter than half as long as the joint, outer lobe evidently longer than the inner; all tarsal claws moderately pectinate.

Male genitalia (Fig. 4B, C): Robust, expanded in median portion, then deeply concave on ventral margin, apex suddenly contracted, sharp, dorsal opening long and large, apex more or less pointed, with a fine tooth at subapex; in dorsal view the apical lamella quite long, slightly longer than wide, roundly obtuse at apex.

Prosternal process bordered at apex; apical margin of abdominal ventrite VII feebly emarginated in male.

Female: Unknown.

Remarks.

Close to Orthogonius perakicus Tian & Deuve, 2007, but labrum strongly emarginated at frontal margin (slightly emarginated in Orthogonius perakicus ), the 4th hind tarsomere deeply emarginated, but with outer lobe about 1/3 as long as the joint (half as long as the joint in Orthogonius perakicus ).

Etymology.

To be dedicated to Mr. Pierre Morvan (Carentoir, France), a good expert of Carabidae .

Distribution.

Southern Thailand.