Neoorthogonius orientalis Tian & Deuve, 2006

Tian, Mingyi & Deuve, Thierry, 2006, Neoorthogonius orientalis, New Genus And New Species Of Orthogoniini (Coleoptera: Caraboidea) From India, The Coleopterists Bulletin 60 (2), pp. 89-94 : 91-93

Neoorthogonius orientalis Tian & Deuve , new species

The following description will serve as a description for both the new genus and new species.

Description. Male: length: 9.0 mm. Breadth: 3.5 mm. Small species of Orthogoniini , yellowish brown in coloration, but antennae, palpi of mouthparts, legs, and underside lighter. Moderately shiny, but elytra dull ( Fig. 1).

Head. Somewhat quadrate, short and wide, HW/HL ¼ 1.13, slightly narrower than pronotum; compound eyes large, prominent, epistomal suture clear, frontal impressions small, frons and vertex flat, faintly rugulose and punctate, neck moderate; clypeus bisetose, mandibles well developed, hooked at apex; paraglossae membranous, not adnate to ligula, extending forward; ligula small and narrow, bisetose at apex; labial palpomere 2 with three setae in the inner side (two normal and one additional), labial palpomere 2 longer than 3; maxillary palpomeres 3 and 4 subequal in length.

Antennae ( Fig. 2 ). Moderate in length, reaching beyond base of elytron, pubescent from antennomere 4; antennomeres 5–10 sub-moniliform; antennomere 1 twice as long as antennomere 2, slightly longer than antennomere 11; antennomeres 3 and 4 subequal, antennomere 4 longer than antennomere 5.

Pronotum ( Fig. 4 ). Quadrate, narrow, slightly wider than head, PW/PL ¼ 1.3, both fore and hind angles broadly rectangular, fore and hind margins bordered, lateral marginal bead very narrow, almost same wide throughout, but a little wider near hind angle, disc slightly convex, basal foveae distinct, wide, and moderately deep, fore transversal impression short and rather wide, hind impression indistinct.

Elytra. Unbordered at base, elongate-ovate, EL/EW ¼ 1.55, surface less convex, humerus quadrate, parallel at sides, slightly contracted in middle portion; apex somewhat obliquely truncate, with outer angle rounded and inner angle nearly rectangular ( Fig. 5 ); striate-punctate, rather deep, intervals convex, even and odd intervals subequal in width, interval 3 with three setiferous pores, basal pore closed to stria 3, middle and apical pores to stria 2.

Legs. Moderate, femora strongly dilated, especially hind femora extraordinarily and laterally dilated ( Fig. 6 ); fore, middle and hind femora with 2, 5 and 4 setae at frontal margins, respectively; middle and hind coxae glabrous; fore tibiae stout, with outer apical angles very sharp, outer margin distinctly serrate ( Fig. 3 ); hind tibia with apical spurs short, broadly rounded; tarsomere 5 unisetose in dorsolateral aspect; hind tarsomere 1 as long as 2, tarsomere 3 longer than 4, tarsomere 4 truncate in frontal margin, not emarginate; all claws pectinate.

Ventral. The prosternal process unbordered at apex, abdominal ventrites 4–6 with cilia in the middle of hind margins. Abdominal ventrite 7 not emarginate at apex in male.

Microsculptures. Indistinct on head and pronotum, isiodiametric meshes on elytra.

Male genitalia ( Figs. 7–8 ). Base portion of aedeagus very large, stout, gradually narrowed towards apex; apical lamella small and rather short, with dorsal opening throughout; parameres normal for Orthogonius .

Female. Unknown.

Remarks. The single specimen is deposited in Bates’ collection (belonging to Oberthür’s collection), MNHN, Paris together with other Orthogoniini materials but without identification label. It is the smallest species in Orthogoniini , and easy to separate from other members of the tribe by its peculiar shape and the size.

Holotype. Male , labeled ‘‘ Bombay’ ’ only, from Maharashtra State, India, deposited in MNHN, Paris.

Etymology. This new taxon is named after the type locality, the oriental region.

Distribution. Bombay, India.

Figures

Figs. 2–8. N. orientalis. 2) antennomeres 5–11, dorsal view; 3) left fore tibia, dorsal view; 4) pronotum; 5) apical right elytron; 6) left hind femur, dorsal view; 7) aedeagus, lateral view; 8) aedeagus, dorsal view (scales ¼ 1.0 mm, a for Figs. 4–6; b for Figs. 2–3, 7–8).