Water-penny-beetles
Guides
Byrrhoidea
Pill, Water and Toe-winged Beetles
Byrrhoidea is a superfamily of beetles within Elateriformia, comprising families that are primarily aquatic or semi-aquatic. It includes the families Byrrhidae (pill beetles), Elmidae (riffle beetles), Dryopidae (long-toed water beetles), Limnichidae (minute marsh-loving beetles), Psephenidae (water penny beetles), Heteroceridae (variegated mud-loving beetles), Chelonariidae (turtle beetles), Eulichadidae (forest stream beetles), Callirhipidae (cedar beetles), Cneoglossidae, and Ptilodactylidae. The superfamily was historically split into Dryopoidea, which is no longer recognized as separate. The current circumscription of Byrrhoidea may not be monophyletic, with Buprestoidea nested within it in some phylogenetic analyses.
Psepheninae
water-penny beetles
Psepheninae is a subfamily of Psephenidae (Coleoptera: Polyphaga) containing water-penny beetles, named for the distinctive flattened, oval larvae that resemble pennies. The subfamily includes at least six genera: Psephenus, Psephenops, Pheneps, Psephenotarsis, Psephenopalpus, and Belicinus. Members are strictly aquatic and occur in the New World from North America through Central America to South America.