Table 5 in The Acidocerinae (Coleoptera, Hydrophilidae): taxonomy, classification, and catalog of species

Table 5. Summary of main diagnostic features of acidocerine genera.
GenusSizeAntennomeresSutural StriaSerial punctures or striae5th VentriteMetafemoraAcidocerus2.8 mm9AbsentPresentEmarginatedMostly pubescentAgraphydrus1.4-4.8 mm8 or 9AbsentVariableVariableVariableAulonochares5.8-7.5 mm9AbsentAbsentEmarginatedMostly pubescentBatochares3-4 mm9AbsentPresentTruncateMostly pubescentChasmogenus2.5-5.0 mm8PresentAbsentEmarginated (weak)Mostly PubescentColossochares8.5-14.0 mm9AbsentAbsentEmarginatedMostly pubescentCrephelochares2.5-4.8 mm9PresentAbsentEmarginated (weak)Mostly pubescentCrucisternum2.0-2.5 mm9AbsentAbsentRoundedMostly pubescentEphydrolithus1.8-3.3 mm9AbsentVariableTruncateMostly glabrousGlobulosis1.9-2.3 mm8AbsentAbsentEmarginatedMostly pubescentHelobata4-7 mm8AbsentVariableEmarginatedMostly pubescentHelochares2-7 mm9AbsentVariableEmarginatedMostly pubescentHelopeltarium3.5 mm9AbsentAbsentEmarginatedMostly pubescentKatasophistes2.7-4.5 mm9AbsentAbsentEmarginated (weak)Mostly pubescentNanosaphes1.1-1.5 mm8AbsentAbsentEmarginatedMostly pubescentNovochares4.5-9.0 mm9AbsentVariableEmarginatedMostly pubescentPeltochares6-14 mm9AbsentVariableEmarginatedMostly pubescentPrimocerus2.4-4.9 mm8PresentVariableVariableVariableQuadriops1.6-2.6 mm9Absent*VariableRoundedMostly glabrousRadicitus4.5-6.2 mm9AbsentVariableRoundedPubescent on anterior thirdSindolus2.5-5.0 mm9AbsentAbsentEmarginatedMostly pubescentTobochares1.5-2.6 mm8Absent*VariableRoundedMostly glabrousTroglochares1.9 mm9AbsentAbsentRoundedPubescent (~half)*
* When impressed, the stria I on each elytron can be comparatively more strongly impressed, specially along the posterior half of the elytron, which might resemble a well-developed sutural stria.