Suborder Adephaga
Note: the family Carabidae (ground beetles), is also part of this suborder; a list of these is at List of ground beetle (Carabidae) species recorded in Britain.
Family Gyrinidae
Family Haliplidae
Family Noteridae
Family Paelobiidae
Family Dytiscidae
Suborder Polyphaga
Infraorder Elateriformia
Superfamily Byrrhoidea
Family Elmidae
Family Dryopidae
Family Limnichidae
Infraorder Staphyliniformia
Superfamily Hydrophiloidea
Family Helophoridae
Family Georissidae
Family Hydrochidae
Family Spercheidae
Family Hydrophilidae
Superfamily Staphylinoidea
Family Hydraenidae