Actenoncus Chaudoir, 1871

Tian, Ming-Yi & Deuve, Thierry, 2009, A review of the genus Actenoncus Chaudoir (Coleoptera: Caraboidea: Orthogoniini), Zootaxa 2135, pp. 57-64 : 58

Genus Actenoncus Chaudoir, 1871

Type species A. atratus Chaudoir, 1871 (= A. ater (Castelnau), 1835 ), in MNHN. Chaudoir, 1871: 126; Andrewes, 1930: 9; Lorenz, 2005: 392

Redefinition of the generic character states of Actenoncus Chaudoir. The members of Actenoncus can be recognized from other orthogonines by the following character states combined: medium-sized (length 12.0- 17.0 mm) for orthogonines; mandibles short, right mandible with ( A. foersteri ) or without (other species) a median tooth; mentum asetose; palpiger with a seta at base; frontal impressions deep, well marked; eyes very large, and very prominent; antennae stout, pubescent from basal one-third of antennomere 4; pronotum strongly transverse, hind angle broadly rounded, median portion of hind margin more or less produced backwards; lateral expanded margins of pronotum well defined, wide or narrow, reflexed or not, and more or less twisted; elytral intervals without setiferous pore; striae shallow or rather deep, punctures large or small, isolated or connected one other; intervals subequal width each other in middle; elytral base unbordered, apex rounded, inner angle with a small but evident denticle; legs slender, spines and spurs short and small; fore tibia slightly dilated at apex, outer angle somewhat rectangular, apex slightly rounded; mid- and hind tibiae hardly enlarged at apex; hind tibia with apical spurs short and sharp; hind tarsomere 1 much longer than 2, tarsomere 3 as long as tarsomere 4, tarsomere 4 asymmetrically and slightly emarginated or deeply bilobed at apex; mid- and hind coxae glabrous in median portion and all tarsal claws simple. Morphological habitus images of Actenoncus species are given in Figs. 1–4 .

Male genitalia. Median lobe of aedeagus widely opening dorsally, stout or slender, the apical lamella very short ( Figs. 8–10 ).

Sexual dimorphism. Male specimens with adhesive setae on fore tarsi, while only with simple setae in female, and abdominal ventrite VII more or less emarginated in male ( Figs. 5–7 ), but complete in female.

Geographical distribution. Southeast Asia.

To date 3 species of Actenoncus have been recorded, viz, A. ater ( Castelnau), 1834 , A. foersteri ( Andrewes), 1931 and A. punctatus Tian and Deuve, 2006 . In addition, a new species, A. wallacei , new species, is hereby described and illustrated from Indonesia.

Figures

FIGURES 1 – 4. Habiti of Actenoncus. 1. A. ater, male, 2. A. wallacei, n. sp., female, holotype, 3. A. punctatus, male, holotype, 4. A. foersteri, male. scale bar: 10.0 mm.

FIGURES 5 – 10. Male abdominal ventrite VII (Figs. 5 – 7) and median lobes of aedeagus, lateral and dorsal views (Figs. 8 – 10) of Actenoncus. 5, 8. A. ater, 6, 9. A. punctatus; 7, 10. A. foersteri. scale bar: 10.0 mm, A for Figs 5 – 7; B for Figs. 8 – 10.