Orthogonius limbourgi, 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 : 100-102

Taxon classification Animalia Coleoptera Carabidae

Orthogonius limbourgi sp. n. Figs 1-2, 3b, 6, 16, 26-27

Holotype.

Male, label "Coll. I.R.Sc.N.B./ Vietnam: Tam Dao NP, 25-28. VII, 2010, light trap, Leg. J. Constant & P. Limbourg; I.G. 31.668", in IRSNB.

Paratypes.

1 female, "Coll. I.R.Sc.N.B./ Vietnam: Cuc Phuong, Day coll. NG/IG, 31.668, 11-18. VIII, 2010, Leg J. Constant & P. Limbourg", in IRSNB; 25 males & 14 females, "Coll. I.R.Sc.N.B./ Vietnam: Cuc Phuong N. P., 20.19 ’00” N, 105.36 ’30” E, 19-23. VII, 2011, night collecting, Leg J. Constant & P. Bresseel; I.G. 31.933", in IRSNB, MNHN and SCAU, respectively; 1 male, "N. Vietnam, Tamdao NP env. 1000 m, VI. 2012, ex coll. A. Popadic", in CIB; 2 females, in CIB and MNHN respectively.

Diagnosis.

A medium-sized species, light dark brown in general, with rather flat and slender body which is smooth and glabrous, and asetose midcoxae and well bordered prosternal process.

Description.

Length: 15.0-16.0 mm; width: 6.0-6.5 mm. Habitus as in Fig. 6.

Body elongate, strongly shiny, smooth and glabrous. Head and disc of pronotum dark brown; elytra, lateral expanded margins of pronotum, mouthparts, antennae, legs and ventral surface reddish brown; whole body dark brown in several specimens. Surface impunctate, head moderately wrinkled on frons, smooth on vertex and pronotum. Microsculptural engraved meshes isodiametric on elytra, indistinct on head and pronotum.

Head longer than wide, HL/HW = 1.12-1.14, eyes small but prominent, frons and vertex moderately convex, frontal impressions large and deep; clypeus bisetose, basal portion even; labrum sex-setose, shallowly emarginate at front margin; palps slender, subcylindrical, the 3rd maxillary palpomere as long as the 4th which is glabrous, the 3rd palpomere with two short setae at apex; the 2nd labial palpomere slightly longer than the 3rd, bisetose in 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 (but an additional seta on the left of mentum in male), palpiger asetose. Antennae moderately long, extending over base of elytra; pubescent from basal 1/3 of the 4th antennomere, slightly expanded at pubescent portion of the 4th; the 3rd antennomere almost as long as the 4th.

Pronotum strongly transverse, PW/PL = 1.59-1.62, disc moderately convex, apical and basal margins well beaded, sides evenly expanded, widest at middle; base slightly wider than apex, bisinuate on base, slightly concave on apical margin; hind angle rounded off; lateral expanded margin well defined, evenly and indistinctly reflexed; both transversal impressions distinct, basal foveae small and deep.

Elytra elongate, and rather flat; EL/EW = 1.64-1.65; widest at about middle, sides parallel at middle, basal border complete, apex bisinuate, inner angle broad, with a small denticle (Fig. 16); striae moderately deep, intervals convex, odd and even intervals subequal in width in middle, the 3rd interval with three setiferous pores; the 7th interval simple.

Legs slender, fore tibiae expanded at apex, with outer angle strongly protrude, outer margin serrate; hind femora rather slender, with three posterior setae; middle coxae setose, hind coxae smooth and glabrous; middle tibiae quite straight, slightly expanded at apex; hind tibiae slightly expanded at apex, apical spurs long and sharp, the 3rd hind tarsomere slightly longer than the 4th which bilobed at apex; all tarsal claws weakly pectinate.

Prosternal process well bordered at apex. Abdominal ventrite VII of male complete; ventrite VII with two pairs of setae on either side of apical margin in both male and female.

Male genitalia: Stout, dorsal opening wide and long, base dilated, gently bent ventrally towards apex, which almost pointed in lateral view; in dorsal view, not contracted before apical lamella, which short and broad, as long as wide, surface granulated.

Remarks.

It is allied to Orthogonius politior sp. n., but its clypeus bisetose (quadrisetose in Orthogonius politior ), prosternal process well-bordered at apex (unbordered in Orthogonius politior ), and the apical lamella of aedeagus shorter and broad at apex (longer and narrow in Orthogonius politior ).

Etymology.

In honor of P. Limbourg (Brussels), one of the holotype collectors.

Distribution.

Northern Vietnam (Fig. 3b).