Classification
Squid are members of the class Cephalopoda, subclass Coleoidea, order Teuthida, of which there are two major suborders, Myopsina and Oegopsina (including giant squids like Architeuthis dux). Teuthida is the largest cephalopod order with around 300 species classified into 29 families.
The order Teuthida is a member of the superorder Decapodiformes (from the Greek for "ten legs"). Two other orders of decapodiform cephalopods are also called squid, although they are taxonomically distinct from Teuthida and differ recognizably in their gross anatomical features. They are the bobtail squid of order Sepiolida and the ram's horn squid of the monotypic order Spirulida. The vampire squid, however, is more closely related to the octopuses than to any squid.
- CLASS CEPHALOPODA
- Subclass Nautiloidea: nautilus
- Subclass Coleoidea: squid, octopus, cuttlefish
- Superorder Octopodiformes
- Superorder Decapodiformes
- ?Order †Boletzkyida
- Order Spirulida: Ram's Horn Squid
- Order Sepiida: cuttlefish
- Order Sepiolida: bobtail squid
- Order Teuthida: squid
- Family †Plesioteuthididae
- Suborder Myopsina
- Family Australiteuthidae
- Family Loliginidae: inshore, calamari, and grass squid
- Suborder Oegopsina
- Family Ancistrocheiridae: Sharpear Enope Squid
- Family Architeuthidae: giant squid
- Family Bathyteuthidae
- Family Batoteuthidae: Bush-club Squid
- Family Brachioteuthidae
- Family Chiroteuthidae
- Family Chtenopterygidae: comb-finned squid
- Family Cranchiidae: glass squid
- Family Cycloteuthidae
- Family Enoploteuthidae
- Family Gonatidae: armhook squid
- Family Histioteuthidae: jewel squid
- Family Joubiniteuthidae: Joubin's Squid
- Family Lepidoteuthidae: Grimaldi Scaled Squid
- Family Lycoteuthidae
- Family Magnapinnidae: bigfin squid
- Family Mastigoteuthidae: whip-lash squid
- Family Neoteuthidae
- Family Octopoteuthidae
- Family Ommastrephidae: flying squid
- Family Onychoteuthidae: hooked squid
- Family Pholidoteuthidae
- Family Promachoteuthidae
- Family Psychroteuthidae: Glacial Squid
- Family Pyroteuthidae: fire squid
- Family Thysanoteuthidae: rhomboid squid
- Family Walvisteuthidae
- Parateuthis tunicata
Read more about this topic: Squid