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Oegopsida

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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.[2]

The Oegopsida are an often pelagic squid, with some nerito-oceanic species associated with sea mounts.[3] 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.[4]

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.

Taxonomy

The following taxonomic classification was found by Fernández-Álvarez et al., 2021:[4]

Phylogeny

The following phylogeny was found by Fernández-Álvarez et al., 2021:[4]

Oegopsida Cranchioidea

Cranchiidae

Ommastrephidae

Thysanoteuthidae

Gonatidae

Histioteuthidae

Onychoteuthidae

Architeuthoidea

Architeuthidae

Neoteuthidae

Cycloteuthoidea

Cycloteuthidae

Brachioteuthidae

Enoploteuthoidea

Enoploteuthidae

Ancistrocheiridae

Lampadioteuthidae

Lycoteuthidae

Pyroteuthidae

Octopoteuthoidea

Octopoteuthidae

Lepidoteuthidae

Chiroteuthoidea

Chiroteuthidae

Mastigoteuthidae

Magnapinnidae

Joubiniteuthidae

Pholidoteuthoidea

Pholidoteuthidae

References

  1. ^ Philippe Bouchet (2018). "Oegopsida". World Register of Marine Species. Flanders Marine Institute. Retrieved 22 February 2018.
  2. ^ 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.
  3. ^ 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.
  4. ^ a b c Fernández-Álvarez, Fernando Ángel; Taite, Morag; Vecchione, Michael; Villanueva, Roger; Louise, Allcock. "A phylogenomic look into the systematics of oceanic squids". academic.oup.com. doi:10.1093/zoolinnean/zlab069. Retrieved 2023-04-08.

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Oegopsida: Brief Summary

provided by wikipedia EN

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.

The Oegopsida are an often pelagic squid, with some nerito-oceanic species associated with sea mounts. 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.

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.

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Classification

provided by World Register of Marine Species
Contains most squids except Loliginidae.
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Gofas, Serge [email]