Chondrichthyes, class Chondrichthyes - cartilaginous fishes

elasmobranch, selachian - any of numerous fishes of the class Chondrichthyes characterized by a cartilaginous skeleton and placoid scales: sharks; rays; skates

family Hexanchidae, Hexanchidae - primitive sharks

family Lamnidae, Lamnidae - oceanic sharks

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

order Torpediniformes, Torpediniformes - rays with torpedo-shaped bodies

Batoidei, order Batoidei, order Rajiformes, Rajiformes - fish with dorsoventrally flattened bodies; includes: rays; skates; guitarfishes; sawfishes

class - (biology) a taxonomic group containing one or more orders