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]
^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.
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...
on the mantle, these fins are far less developed than other families in Cirrina and essentially only act as stabilizers when the animal swims (using a...
historically divided into two suborders, the Incirrina and the Cirrina. More recent evidence suggests Cirrina is merely the most basal species, not a unique clade...
mechanism. All cephalopods, with the exception of the Nautilidae and the Cirrina (deep-sea octopuses), are able to release ink to confuse predators. The...
of the Nautilidae and the species of octopus belonging to the suborder Cirrina, all known cephalopods have an ink sac, which can be used to expel a cloud...
Animalia Phylum: Mollusca Class: Cephalopoda Order: Octopoda Suborder: Cirrina Family: Grimpoteuthidae O'Shea, 1999 Type genus Grimpoteuthis Genera Grimpoteuthis...
records of up to 9.8 m can be found in the literature (see High, 1976:18). Cirrina gen. et sp. indet. over 4 m (estimate) Voss (1988); Vecchione et al. (2008)...
Global Information
