Cirrina

Cirrina
Stauroteuthis syrtensis
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Order:	Octopoda
Suborder:	Cirrina Grimpe, 1916
Families
Opisthoteuthidae Cirroteuthidae Stauroteuthidae
Synonyms
Cirrata Grimpe, 1916 Cirroctopoda Young, 1989

Cirrina is a suborder of octopuses. Cirrate octopuses have a small, internal shell and two fins on their head, while their sister suborder Incirrina has neither.

The suborder is named for small cilia-like strands on the arms of the octopus. There is a pair of cirri for each sucker. These are thought to play some role in feeding, perhaps by creating currents of water that help bring food closer to the beak. Cirrate octopuses are noteworthy for lacking an ink sac.

Classification

• CLASS CEPHALOPODA
  • Subclass Nautiloidea: nautilus
  • Subclass †Ammonoidea: ammonites
  • Subclass Coleoidea
    • Superorder Decapodiformes: squid, cuttlefish
    • Superorder Octopodiformes
      • Family †Trachyteuthididae (incertae sedis)
      • Order Vampyromorphida: Vampire Squid
      • Order Octopoda
        • Genus †Keuppia (incertae sedis)
        • Genus †Palaeoctopus (incertae sedis)
        • Genus †Paleocirroteuthis (incertae sedis)
        • Genus †Pohlsepia (incertae sedis)
        • Genus †Proteroctopus (incertae sedis)
        • Genus †Styletoctopus (incertae sedis)
        • Suborder Cirrina: finned deep-sea octopus
          • Family Opisthoteuthidae: umbrella octopus
          • Family Cirroteuthidae
          • Family Stauroteuthidae
        • Suborder Incirrina

External links

• Tree of Life website gives information about the classification of cephalopod groups