Byrrhoidea

Byrrhoidea is a superfamily of beetles that includes several families which are either aquatic or associated with a semi-aquatic habitat. Other than the superfamily Hydrophiloidea, the majority of the remaining Polyphagan beetles which are aquatic are in this superfamily. These families were traditionally grouped as a separate superfamily, the Dryopoidea, which is no longer recognized. The vast majority of species are small (<1 cm), and predominantly dull brown or black.

Pill beetles and allies
Byrrhus pilula
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Coleoptera
Suborder:	Polyphaga
Infraorder:	Elateriformia
Superfamily:	Byrrhoidea
Families
Byrrhidae - pill beetles Callirhipidae - cedar beetles Chelonariidae - turtle beetles Cneoglossidae Dryopidae - long-toed water beetles Elmidae - riffle beetles Eulichadidae - forest stream beetles Heteroceridae - variegated mud loving beetles Limnichidae - minute mud beetles Lutrochidae - travertine beetles Psephenidae - water pennies Ptilodactylidae