Chasmogenus Sharp, 1882

Jia, Fenglong & Tang, Yu-dan, 2018, A faunistic study of genus Chasmogenus Sharp, 1882 of China (Coleoptera, Hydrophilidae), ZooKeys 738, pp. 59-66 : 60

Chasmogenus Sharp, 1882

Chasmogenus Sharp, 1882: 73. Type species: Chasmogenus fragilis Sharp.

Crephelochares Kuwert, 1890: 38. Type species: Helochares livornicus Kuwert. Syn.: d’Orchymont 1919: 148; Fernández 1986: 148.

Diagnosis.

The following character combinations can be used to separate Chasmogenus Sharp, 1882 from other genera: 1) maxillary palpi at least as long as width of head; 2) second maxillary palpomeres curved inward, apical segment almost symmetrical, as long as penultimate; 3) clypeus not concealing labrum and not expanded in front of eyes; 4) mesoventrite with rather strong median carina for entire length; 5) elytra without striae or rows of serial punctures; 6) elytra with sutural stria on posterior half; 7) posterior margin of 5th abdominal ventrite with a small apical emargination.