Chlaenioctenus Bates, 1892

Liu, Ye, Liang, Hongbin, Kavanaugh, David H. & Yang, Maofa, 2010, Key to species of the subgenus Chlaenioctenus (Coleoptera: Carabidae: Chlaeniini: Chlaenius), with description of two new species, Zootaxa 2397, pp. 15-28: 16-17

publication ID 10.5281/zenodo.193988

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Chlaenioctenus Bates, 1892


Subgenus Chlaenioctenus Bates, 1892 

Chlaenioctenus Bates, 1892: 309  ; Kirschenhofer, 2003: 48; Kirschenhofer, 2008: 11

Type species. Chlaenioctenus pectinipes Bates, 1892  , designated by Basilewsky & Grundmann, 1954

Description. Body long-oval, length 13.5 to 16.0 mm, width 5.0 to 6.0 mm. Black with metallic lustre, elytra with two round yellow spots ( Figs. 1, 3View FIGURES 1 – 4, 5, 7View FIGURES 5 – 8, 9View FIGURES 9 – 10, 11, 13, 14). Head moderately large, vertex more or less punctate ( Figs. 20–25View FIGURES 20 – 25); eyes large and prominent; antennae long, antennomeres 1–3 sparsely pubescent, antennomeres 4–11 densely pubescent, antennomere 1 distinctly cylindrical, antennomere 3 elongated, slightly shorter than antennomeres 1 and 2 combined, longer than antennomere 4; clypeus and labrum emarginate at apex; labrum with six setigerous punctures near apex; mandible triangle, faintly hooked at apex; palpi glabrous, apical labial palpomere moderately rhombic in male ( Fig. 16View FIGURES 16 – 19), cylindrical and slightly compressed in female ( Fig. 17View FIGURES 16 – 19); mentum tooth distinct, rounded at apex ( Figs. 26–28View FIGURES 26 – 28); glossal sclerite with two subapical setae; gula glabrous. Pronotum ovoid ( Figs. 29–34View FIGURES 29 – 34), truncated at apex and base, disk more or less punctate, pubescent or not, hind angle with one seta. Scutellum triangular, glabrous, with fine microsculptures. Elytra elongate, pubescent, apex of elytra more rounded in females than in males; intervals with distinct microsculpture; striae shallow, punctate; shoulders rounded. Hind wings reduced, brachypterous ( Fig. 18View FIGURES 16 – 19). Proepisterna smooth or sparsely punctate. Prosternal process bordered, with short setae. Metaepisterna coarsely punctate, pubescent or not, with a longitudinal furrow near outer margin. Abdominal sterna pubescent, sterna 3 to 5 with a long seta on each side, sternum 6 with one seta on each side in male, two in female. Front femora with one tooth on inner margin in male ( Fig. 19View FIGURES 16 – 19), without tooth in female; tarsi glabrous dorsally, pro-tarsi with basal three tarsomeres dilated in male; claws pectinate ( Figs. 40–43View FIGURES 40 – 43).

Geographical distribution. India, Myanmar, Tailand, China. The collecting sites of Chlaenius  ( Chlaenioctenus  ) species are shown in Fig. 53View FIGURE 53. This subgenus is widely distributed in the South Asia; but the distributions of individual species are apparently restricted to very small areas. This is probably reflective of low dispersal ability due to reduced (non-functional) hindwings.

Biology. Adults of this species have been collected along roads at night and by use of pitfall traps. Although the hind wings are reduced and nonfunctional in all specimens examined, several specimens had been collected under lights at night. It is most likely that they walked or ran to the lights to feed on prey attracted to the lights.

Remarks. Based on the metallic body surface, single supraorbital seta, antennae with antennomere 3 longest and antennomeres 4–11 densely pubescent, Chlaenioctenus  can be recognized easily as a member of genus Chlaenius  . Adults of the subgenus are mostly similar to those of subgenera Lissauchenius  and Ocybatus  of genus Chlaenius  in general body shape in having a round yellow spot on each elytron, but different from them and those of other subgenera in having pectinate claws, which are unique in the genus.












Chlaenioctenus Bates, 1892

Liu, Ye, Liang, Hongbin, Kavanaugh, David H. & Yang, Maofa 2010


Kirschenhofer 2008: 11
Kirschenhofer 2003: 48
Bates 1892: 309