Cephalopoda (Cephalopods)
Modern cephalopods comprise two subclasses: Coleoidea (cuttlefish, octopuses, squids, etc.) and Nautiloida (nautiluses). A third subclass, Ammonoidea (ammonoids, including ammonites), became extinct c. 66mya.
Subclass: Coleoidea
Superorder: Decapodiformes (=Decabrachia)
Order: Bathyteuthida (Bathyteuthid squids)
—No subordinate taxa
Order: Idiosepida (Idiosepid squids)
—No subordinate taxa
Order: Myopsida (Myopsid squids)
—No subordinate taxa
Order: Oegopsida (Oegopsid squids)
—No subordinate taxa
Order: Sepiida (Cuttlefish and relatives)
—No subordinate taxa
Order: Spirulida (Ram's horn squid) (1 genus; 1 species)
—No subordinate taxa
Superorder: Octopodiformes (=Octobrachia)
Order: Octopoda (Octopuses) (c.300 species)
Family: Octopodidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Callistoctopus furvus | (Gould, 1852) | Sand octopus, Caribbean sand octopus, Eastern octopus, Brazilian eastern octopus, Polvo-de-leste | (rediscovered) | Brazil, Colombia, Mexico & Turks and Caicos Islands | Rediscovered | Access |
Order: Vampyromorpha (Vampire squid) (1 genus; 1 species)
Family: Vampyroteuthidae
—No subordinate taxa
Subclass: Nautiloida (Nautiluses) (2 genera; 13 species)
Order: Nautilida
Family: Nautilidae (2 genera; 13 species)
—No subordinate taxa
Statistics
| Conservation status | Number of taxa (in percentage) |
| Extinct | 0 |
| Missing | 0 |
| Extinct in the Wild | 0 |
| Possibly Extinct in the Wild | 0 |
| Globally Rediscovered | 1 (100%) |
| Rediscovered in the Wild | 0 |
| Hypothetical | 0 |
| Invalid | 0 |
| Erroneously listed | 0 |
| Uncertain status | 0 |
| Total | 1 |