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 e
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Coleoptera
Suborder: Polyphaga
Infraorder: Elateriformia
Superfamily: Byrrhoidea

Byrrhidae - pill beetles
Callirhipidae - cedar beetles
Chelonariidae - turtle beetles
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

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