CLASS : CHONDRICHTHYES
SUBCLASS :SELACHII
SUPERORDER :EUSELACHII
ORDER :PLEUROTREMATA

The Suborders and Families of Sharks
ORDER PLEUROTREMATA

Suborder Hexanchiformes

Family HEXANCHIDAE - Cow sharks ( Hexanchus ), Six or seven gilled sharks 
( Heptranchias, Notorhynchus )
Family CHLAMYDOSELACHIDAE - Frilled sharks ( Chlamydoselachus )

Suborder Heterodontiformes

Family HETERODONTIDAE - Port Jackson Sharks( Heterodontus ) Horn sharks or Bull-headed Sharks

Suborder Galeiformes

Family ODONTASPIDIDAE - Sand Sharks ( Odontaspis )
Family SCAPANNORHYNCHIDAE - Goblin Sharks ( Mitsukurina )
Family ISURIDAE - Mackerel Sharks ( Carcharodon, Isurus, Lamna )
Family CETORHINIDAE - Basking Sharks ( Cetorhinus )
Family ALOPIIDAE - Thresher Sharks ( Alopias )
Family ORECTOLOBIDAE - Carpet Sharks ( Orectolobus, Ginglymostoma, Stegostoma )
Family RHINCODONTIDAE - Whale Sharks ( Rhincodon )
Family SCYLIORHINIDAE - Dogfishes, Cat sharks, Swell Sharks ( Scyliorhinus, Galeus, Apristurus )
Family PSEUDOTRIAKIDAE - False Cat Sharks ( Pseudotriakis )
Family TRIAKIDAE - Smooth Hounds or Smooth Dogfishes ( Triakis, Mustelus, Triaenodon)
Family CARCHARHINIDAE - Grey Sharks, Requiem Sharks ( Carcharhinus, Negaprion, Prionace, Galeocerdo, Scoliodon, Galeorhinus, Hemipristis )
 Family SPHYRNIDAE - Hammerhead Sharks ( Sphyrna )

Suborder Squaliformes

Family SQUALIDAE - Spiny Dogfishes ( Squalus, Etmopterus, Centrophorus, Oxynotus, Centrosycmnus )
Family DALATIIDAE - Sleeper Sharks ( Somniosus, Isistius ), Spineless Dogfishes (Euprotomicrus, Squaliolus, Dalatius )
Family ECHINORHINIDAE - Bramble Sharks ( Echinorhinus )
Family PRISTIOPHORIDAE - Saw Sharks ( Pristiophorus, Pliotrema )
Family SQUATINIDAE - Monkfishes, Angel Sharks ( Squatina )