Orthogonius sabahicus, 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 : 104-106

Taxon classification Animalia Coleoptera Carabidae

Orthogonius sabahicus sp. n. Fig. 5

Holotype.

male, "Malaisie, Sabah, Crocker Range, Avril 94, Chew", in MNHN; paratypes: 1 male, "Malaysia, N. Borneo, Sabah, Keningau distr. Trus Madi Mt. 1150 m, 7.VII.2011, A. Klimenko legit", in CIB; 1 female, IBID, in SCAU.

Length: 16.0-17.0 mm; width: 6.5-6.6 mm. Habitus as in Fig. 5A.

Description.

Head dark brown, other parts reddish brown; smooth and glabrous, impunctate, elytral intervals covered with fine and sparse punctures; head and pronotum faintly wrinkled; microsculptural engraved meshes isodiametric on head, pronotum and elytra.

Head stout, slightly longer than wide, HL/HW = 1.05-1.10; vertex convex; labrum quite long, nearly as long as wide, widely and feebly emarginated at frontal margin, 6-setose; clypeus bisetose, base raised and sides longitudinal furrowed, joining to the frontal impressions; frontal impressions pit-like; eyes moderately developed and prominent; palps slender, subcylindrical, the 3rd maxillary palpomere as long as the 4th, both glabrous, with two short setae at apex of the 3rd; the 2nd labial palpomere slightly longer than the 3rd, bisetose on inner margin, the 3rd faintly and sparsely setose; ligula narrow, bisetose at apex; mentum and palpigers unsetose, submentum bisetose; antennae extending beyond basal 1/5 of elytra, pubescent from the 4th antennomere, starting from basal 1/4; the 1 st– 3rd antennomeres and basal 1/4 of the 4th antennomere glabrous; the 1st antennomere stouter than other, with a long seta at subapex, several shorter setae present at apexes of each joint from the 2nd antennomere; the 1st antennomere less than twice as long as the 2nd, and slightly longer than the 3rd.

Pronotum transverse, notably wider than long, PW/PL = 1.66-1.68, widest at about middle; lateral expanded margins flat, even, feebly reflexed throughout; front and base well bordered; fore transversal impression faint, basal one evident; basal foveae small; disc markedly convex; front margin nearly straight at middle, basal margin feebly bisinuate; hind and front angles completely rounded off; base slightly shorter than front.

Elytra elongate-ovate, distinctly longer than wide, EL/EW = 1.61-1.63; nearly parallel-sided, widest at middle; basal border interrupted against the 1 st– 3rd intervals; humeri rather square; apex roundly truncate, without outer angles, inner angle broadly blunt; disc convex; striae finely and deeply striate; intervals convex, subequal in width; the 3rd interval with median and posterior setiferous pores (anterior one wanted), both are located on middle of the interval.

Femora moderately expanded, hind femur bisetose posteriorly; for tibia dilated at apex, apical margin obtusely truncate or sinuate towards outer angle, outer margin notably serrate; middle tibia slightly curved; hind legs slender, apical spurs long and sharp, the 1st and 3rd tarsomeres much longer than the 2nd and 4th respectively, the 4th tarsomere deeply emarginated at apex, with lobes about half as long as the joint; fore and middle tarsal claws weakly pectinate, hind claws simple.

Prosternal process bordered at apex; abdominal ventrite VII finely and shallowly emarginate at apical margin in male.

Male genitalia (Fig. 5B, C): Stout and robust, apex suddenly narrowed and pointed in lateral view; the apical lamella short, wider than long.

Remarks.

It is a very peculiar species, differing from other congeners by its mentum asetose, elytral base incompletely bordered, anterior dorsal pores missed on the 3rd interval, and hind tarsal claws simple.

Etymology.

To refer to the type locality.

Distribution.

Malaysia (Sabah).