Oegopsida

Oegopsida
Temporal range: Late Cretaceous – recent[1]
Moroteuthis ingens
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Superorder: Decapodiformes
Order: Oegopsida
Orbigny, 1845[2]
Families

See text

Synonyms
  • Decabranchia
  • Decapoda Leach, 1817

Oegopsida is one of the two orders of squid in the superorder Decapodiformes, in the class Cephalopoda. Together with the Myopsina, it was formerly considered to be a suborder of the order Teuthida, in which case it was known as Oegopsina. This reclassification is due to Oegopsina and Myopsina not being demonstrated to form a clade.[3]

The Oegopsida are an often pelagic squid, with some nerito-oceanic species associated with sea mounts.[4] They consist of 24 families and 69 genera. They have these characters in common: the head is without tentacle pockets, eyes lack a corneal covering, arms and tentacle clubs may have hooks, the buccal supports are without suckers, and oviducts in females are paired.

Two families, the Bathyteuthidae and Chtenopterygidae, which have features characteristic of the Myopsida while retaining others common to the Oegopsina, were formerly placed in the family, but are now placed in their own order Bathyteuthida.[5]

The Oegopsida differ from the coastal Myopsida, characterised by the genus Loligo, which have corneal coverings over the eyes and tentacle pockets, but lack hooks, have no suckers on the buccal supports, and a single oviduct.

Oegopsid squid are the only decapods that lack a pocket for the tentacles. Otherwise, they share different characters with different decapod groups. Like the Bathyteuthida and Myopsida, the Oegopsida have a brachial canal, which is absent in other forms. As with the Spirulidae and Idiosepiidae, the Oegopsida lack suckers on the buccal supports, and like the Bathyteuthida, Idiosepiidae, and Spirulidae, they have no circular muscle on the suckers.

  1. ^ Cite error: The named reference Tanabe2006 was invoked but never defined (see the help page).
  2. ^ Philippe Bouchet (2018). "Oegopsida". World Register of Marine Species. Flanders Marine Institute. Retrieved 22 February 2018.
  3. ^ Jan M. Strugnell; Annie Lindgren; Louise M. Allcock (2009). "Cephalopod mollusks Cephalopoda". In S. Blair Hedges; Sudhir Kumar (eds.). The Timetree of Life. OUP Oxford. pp. 2–18.
  4. ^ P., Roper, Clyde F. E., 1937- Jereb (2010). Cephalopods of the world : an annotated and illustrated catalogue of cephalopod species known to date (PDF). Food and Agriculture Organization of the United Nations. ISBN 978-9251053836. OCLC 880299294.{{cite book}}: CS1 maint: multiple names: authors list (link) CS1 maint: numeric names: authors list (link)
  5. ^ Cite error: The named reference :0 was invoked but never defined (see the help page).