Megagraphydrus Hansen, 1999

Jia, Fenglong, 2010, Megagraphydrus puzhelongi, sp. n., a new water scavenger beetle from China (Coleoptera: Hydrophilidae: Hydrophilinae), Zootaxa 2498, pp. 65-68 : 65

Genus Megagraphydrus Hansen, 1999

Megagraphydrus Hansen, 1999: 137 (type species: Megagraphydrus siamensis Hansen, 1999 by original designation); Hebauer, 2000: 14; Minoshima & Fujiwara, 2009: 55.

Diagnosis. The following character combinations can be used to separate Megagraphydrus from other genera of the subtribe Acidocerina : 1) apical maxillary palpomere slightly shorter to slightly longer than penultimate; 2) the second maxillary palpomere almost straight, weakly swollen towards apex; 3) elytra without sutural striae; 4) Elytra with distinct, irregular, longitudinal rows of punctures, the systematic punctures mixed with these rows. 5) mesoventrite with a well defined transverse ridge; 6) edge of elytron with a number of minute spines observed from the underside.