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

Tian, Mingyi & Deuve, Thierry, 2016, Definition of the jianfengling species group of the ground beetle genus Orthogonius MacLeay (Coleoptera, Carabidae, Orthogoniini), ZooKeys 615, pp. 95-117 : 107

Taxon classification Animalia Coleoptera Carabidae

Orthogonius bellus sp. n. Figs 3c 9, 19, 36-37

Holotype.

Male, "S. Vietnam, 40 km NW An Khe, Buon Luoi, 620-750 m", " 14.10 N / 108.30 E, 28. III-12.IV. 1995, Pacholatko & Dembicky", "Mus. Wien."

Paratype.

1 male, ibid. in NHMV.

Diagnosis.

A fairly large species, with a yellowish and slender body which is less depressed, but strongly shiny, smooth and glabrous, having a bordered prosternal process, an edentate mentum and asetose midcoxae.

Description.

Length: 18.5 mm; width: 7.0 mm. Habitus as in Fig. 9.

Body elongate, strongly shiny, smooth and glabrous. Yellowish to brown, except head which dark brown. Head and pronotum impunctate, elytral odd intervals with a few punctures. Microsculptural engraved meshes isodiametric on head and elytra, transverse on pronotum.

Head longer than wide, HL/HW = 1.12, eyes small but prominent, frons and vertex convex, frontal impressions deep and long, extending beyond the level of fore supraorbital setae; clypeus bisetose, basal portion of surface uneven; labrum sex-setose, faintly emarginate at apical margin; palps slender, subcylindrical, the 3rd maxillary palpomere as long as the 4th which glabrous; the 3rd maxillary palpomere with two short setae at apex; the 2nd labial palpomere slightly longer than the 3rd, bisetose on inner margin, with several additional setae at subapex and apex; the 3rd labial palpomere with a few setae at basal part; ligula small, bisetose at apex; mentum edentate; each of mentum and submentum bisetose, palpiger asetose. Antennae rather long, extending basal one third of elytra; pubescent from basal one third of the 4th antennomere, slightly expanded at pubescent portions; the 3rd antennomere almost as long as the 4th.

Pronotum strongly transverse, PW/PL = 1.64, disc moderately convex, apical and basal margins well beaded, sides evenly expanded, widest at middle; lateral expanded margin well defined and reflexed, surface uneven; both transversal impressions well marked, basal foveae small and deep.

Elytra elongate-ovate, EL/EW = 1.69; widest at about apical one third of elytra, sides parallel at middle, basal border complete, apex broadly sinuate, inner angle nearly rectangular (Fig. 19); striae deep, intervals distinctly convex, subequal in width with each other at middle, the 3rd interval with three setiferous pores.

Legs rather slender, fore tibiae slightly expanded at apex, outer angle distinctly protruding and sharp, outer margin somewhat sub-serrate; middle and hind coxae smooth and glabrous; middle tibiae quite straight, slightly expanded at apex; hind tibiae hardly expanded at apex, apical spurs long and sharp; the 3rd hind tarsomere as long as the 4th which deeply bilobed at apex; claws weakly pectinate.

Prosternal process faintly bordered at apex.

Male genitalia (Figs 36-37): Stout, slightly sinuate at ventral side, dorsal opening wide, apex densely spinulate, apical lamella very short, broad, much wider than long.

Female: Unknown.

Remarks.

Probably close to Orthogonius limbourgi sp. n., but its body less depressed, and hind 3rd tarsomere as long as 4th (versus in Orthogonius limbourgi ).

Etymology.

“Bellus”, a Latin word meaning beautiful, refering to the charmof this species.

Distribution.

Southern Vietnam (Fig. 3c).