Cirrina

Cirrina
Temporal range: Campanian–present
Oral view of Cirrothauma murrayi showing single row of suckers and paired cirri
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Order: Octopoda
Suborder: Cirrina
Grimpe, 1916 sensu Felley et al., 2001
Families

Opisthoteuthidae
Grimpoteuthidae
Cirroteuthidae
Stauroteuthidae
Cirroctopodidae

Synonyms
  • Cirrata
    Grimpe, 1916
  • Cirroctopoda
    Young, 1989

Cirrina or Cirrata is a suborder and one of the two main divisions of octopuses. Cirrate octopuses have a small, internal shell and two fins on their head, while their sister suborder Incirrina has neither. The fins of cirrate octopods are associated with a unique cartilage-like shell in a shell sac. In cross-section, the fins have distinct proximal and distal regions, both of which are covered by a thin surface sheath of muscle.

The suborder is named for small, cilia-like strands (cirri) on the arms of the octopus, a pair 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 ink sacs.

The oldest known member of the group is Paleocirroteuthis from the Late Cretaceous of Japan and Canada.[1]

  1. ^ Tanabe, Kazushige; Trask, Pat; Ross, Rick; Hikida, Yoshinori (2008). "Late Cretaceous octobrachiate coleoid lower jaws from the north Pacific regions". Journal of Paleontology. 82 (2): 398–408. doi:10.1666/07-029.1. ISSN 0022-3360.