14 in two suborders, see text. Scientific classification - Wikipedia /**/ @import /skins/monobook/IE50Fixes. ... Phyla Porifera (sponges) Ctenophora (comb jellies) Cnidaria Placozoa Bilateria Acoelomorpha Orthonectida Rhombozoa ?Myxozoa Superphylum Deuterostomia Chordata (vertebrates, etc. ... Classes Caudofoveata Aplacophora Polyplacophora - Chitons Monoplacophora Bivalvia - Bivalves Scaphopoda - Tusk shells Gastropoda - Snails and Slugs Cephalopoda - Squids, Octopuses, etc. ... Orders Sepiida Sepiolida Spirulida Teuthida Octopoda Vampyromorphida Nautilida The Cephalopods (head-foot) are the mollusc class Cephalopoda characterized by bilateral body symmetry, a prominent head, and a modification of the mollusc foot into the form of arms or tentacles. ... Orders Sepiida Sepiolida Spirulida Teuthida Octopoda Vampyromorphida Subclass Coleoidea is the grouping of cephalopods containing all the primarily soft_bodied creatures. ... Families 14 in two suborders, see text The octopus is a cephalopod of the order Octopoda that inhabits many diverse regions of the ocean, especially coral reefs. ... Scientific classification or biological classification refers to how biologists group and categorize extinct and living species of organisms. ...
Cirrina is a suborder of the order Octopoda. Most lay people are unaware of this order and even biologists do not know much about it. Cirrina octopuses have a small, internal shell and two fins on their head, while their sister suborder, the Incirrina has neither. Families 14 in two suborders, see text The octopus is a cephalopod of the order Octopoda that inhabits many diverse regions of the ocean, especially coral reefs. ... Families 14 in two suborders, see text. ...
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.
The size of the opening through which they can squeeze is only restricted by the size of their beaks.
A few octopuses in the Cirrina suborder do have internal shells though as well as two fins, though very little is yet known about these fascinating species.
The octopuses beak is the hardest part of most octopus bodies which is used primarily to break through the external skeletons of crustaceans and the shells of bivalves.
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