Cobitidae, family Cobitidae - loaches

Cyprinidae, family Cyprinidae - a family of fish including: carp; tench; roach; rudd; dace

Electrophoridae, family Electrophoridae - small family comprising the electric eels

Catostomidae, family Catostomidae - suckers; closely related to the family Cyprinidae

Cyprinodontidae, family Cyprinodontidae - large family of small soft-finned fishes; killifishes; flagfishes; swordtails; guppies

family Poeciliidae, Poeciliidae - topminnows

family Holocentridae, Holocentridae - squirrelfishes and soldierfishes

Anomalopidae, family Anomalopidae - a family of fish including: flashlight fishes

family Zeidae, Zeidae - a family of fish in the order Zeomorphi

Caproidae, family Caproidae - boarfishes

family Fistulariidae, Fistulariidae - cornetfishes

family Gasterosteidae, Gasterosteidae - sticklebacks

family Syngnathidae, Syngnathidae - pipefishes

family Macrorhamphosidae, Macrorhamphosidae - bellows fishes

Centriscidae, family Centriscidae - shrimpfishes

Aulostomidae, family Aulostomidae - trumpetfishes

Craniata, subphylum Craniata, subphylum Vertebrata, Vertebrata - fishes; amphibians; reptiles; birds; mammals

family Petromyzontidae, Petromyzontidae - lampreys

family Myxinidae, Myxinidae - slime-producing marine animals: hagfishes

Chimaeridae, family Chimaeridae - a family of Holocephali

family Hexanchidae, Hexanchidae - primitive sharks

family Lamnidae, Lamnidae - oceanic sharks

family Isuridae, Isuridae - in some classifications another name for the family Lamnidae

Cetorhinidae, family Cetorhinidae - in some older classifications considered the family of the basking sharks

Alopiidae, family Alopiidae - thresher sharks

family Orectolobidae, Orectolobidae - nurse sharks and carpet sharks

Carchariidae, family Carchariidae, family Odontaspididae, Odontaspididae - sand sharks; in some classifications coextensive with family Carcharhinidae

family Rhincodontidae, Rhincodontidae - small-toothed sharks comprising only one species

family Scyliorhinidae, Scyliorhinidae - small bottom-dwelling sharks

Carcharhinidae, family Carcharhinidae - largest family of living sharks; found worldwide especially in tropical waters; dorsal fin lacks spines: requiem sharks including tiger sharks and soupfin sharks

family Triakidae, Triakidae - small smooth-skinned sharks lacking spines on dorsal fins

family Squalidae, Squalidae - dogfishes having a spine in each dorsal fin

family Sphyrnidae, Sphyrnidae - hammerhead sharks; bonnethead sharks

family Squatinidae, Squatinidae - bottom-dwelling ray-like sharks

family Torpedinidae, Torpedinidae - electric rays

family Pristidae, Pristidae - large primitive rays with elongated snouts

family Rhinobatidae, Rhinobatidae - primitive rays with guitar-shaped bodies

Dasyatidae, family Dasyatidae - sting rays

family Myliobatidae, Myliobatidae - eagle rays

family Mobulidae, Mobulidae - large rays lacking venomous spines: mantas