Dytiscidae Coleoptera 74 Chaetotaxy 44 Hydroporinae 38 Hygrobiidae 38 beetle 34 larva 26 morphology 22 morphometry 22 Bidessini 20 Dytiscinae 20 Phylogeny 20 Diving beetles 18 Larva 18 Larval morphology 18 phylogenetics 18 taxonomy 18 Hydroporini 14 Morphometry 14 Phylogenetic relationships 14 phylogeny 14 Cybistrini 12 Hyphydrini 12 Larvae 12 cladistics 12 Argentina 8 Colymbetinae 8 Hydrovatini 8 Laccophilinae 8 Megadytes 8