Oegopsida is one of the two orders of squid in the superorder

Decapodiformes Decapodiformes is a superorder of Cephalopoda comprising all cephalopod species with ten limbs, specifically eight short arms and two long tentacles. It is hypothesized that the ancestral coleoid had five identical pairs of limbs, and that one ...

, in the

class Class or The Class may refer to: Common uses not otherwise categorized * Class (biology), a taxonomic rank * Class (knowledge representation), a collection of individuals or objects * Class (philosophy), an analytical concept used differentl ...

Cephalopoda. Together with the

Myopsina Myopsida is one of the four orders of squid. It consists of two families: the monotypic '' Australiteuthis'' and the diverse and commercially important Loliginidae (~50 species). Some taxonomists classify this taxon as a suborder of the order ...

, 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 Family (from la, familia) is a group of people related either by consanguinity (by recognized birth) or affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its members and of society. Ideal ...

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 Myopsida is one of the four orders of squid. It consists of two families: the monotypic '' Australiteuthis'' and the diverse and commercially important Loliginidae (~50 species). Some taxonomists classify this taxon as a suborder of the order ...

while retaining others common to the Oegopsina, are sometimes placed in the Bathyteuthoidea. The Oegopsida differ from the coastal Myopsida, characterised by the genus ''

Loligo ''Loligo'' is a genus of squid and one of the most representative and widely distributed groups of myopsid squid. The genus was first described by Jean Baptiste Lamarck in 1798. However, the name had been used earlier than Lamarck (Schneider, ...

'', 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 Bathyteuthoidea 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 Bathyteuthoidea, Idiosepiidae, and Spirulidae, they have no circular muscle on the suckers. *Order Oegopsida **Family Ancistrocheiridae **Family Architeuthidae **Family Bathyteuthidae **Family Batoteuthidae **Family

Brachioteuthidae Brachioteuthidae is a family Family (from la, familia) is a group of people related either by consanguinity (by recognized birth) or affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of ...

**Family

Chiroteuthidae The Chiroteuthidae are a family of deep-sea squid, generally small to medium in size, rather soft and gelatinous, and slow moving. They are found in most temperate and tropical oceans, but are known primarily from the North Atlantic, North Pac ...

**Family Chtenopterygidae **Family Cranchiidae **Family Cycloteuthidae **Family

Enoploteuthidae The Enoploteuthidea are a family of squid comprising approximately 40 species in four genera. Most species have a mantle length ranging from 3–13 cm. Hooks are present on all arms and tentacles. The family is best known for the large ...

**Family

Gonatidae The Gonatidae, also known as armhook squid, are a family of moderately sized squid. The family contains about 19 species in three genera, widely distributed and plentiful in cold boreal waters of the Pacific Ocean. At least one species is known f ...

**Family Histioteuthidae **Family Joubiniteuthidae **Family Lepidoteuthidae **Family Lycoteuthidae **Family Magnapinnidae **Family Mastigoteuthidae **Family

Neoteuthidae The Neoteuthidae are a family (biology), family of squid comprising four monotypic genus, genera. They are thought to be the closest relatives to the famous giant squid (''Architeuthis dux''). Species * ''Alluroteuthis'' ** ''Alluroteuthis antar ...

**Family

Octopoteuthidae The Octopoteuthidae are a family of squid comprising two genera. The family is characterized by tentacles which cease to grow after the paralarval stage, and the use of a penis, instead of a hectocotylus A hectocotylus (plural: ''hectocotyli' ...

**Family

Ommastrephidae Ommastrephidae is a family of squid containing three subfamilies, 11 genera, and over 20 species. They are widely distributed globally and are extensively fished for food. One species, '' Todarodes pacificus'', comprises around half of the world ...

**Family Onychoteuthidae **Family Pholidoteuthidae **Family Promachoteuthidae **Family Psychroteuthidae **Family Pyroteuthidae **Family Thysanoteuthidae **'' Parateuthis tunicata'' (''

incertae sedis ' () or ''problematica'' is a term used for a taxonomic group where its broader relationships are unknown or undefined. Alternatively, such groups are frequently referred to as "enigmatic taxa". In the system of open nomenclature, uncertain ...

'') These families group into a number of different clades but these have not yet been formally given names. These groupings are: *Architeuthids **Architeuthidae **Neoteuthidae *Brachioteuthids **Brachioteuthidae *Chiroteuthids **Batoteuthidae **Chiroteuthidae **Joubiniteuthidae **Magnapinnidae **Mastigoteuthidae **Promachoteuthidae *Cranchiids **Cranchiidae *Cycloteuthids **Cycloteuthidae *Enoploteuthids **Ancistrocheiridae **Enoploteuthidae **Lycoteuthidae **Pyroteuthidae *Gonatids **Gonatidae *Histioteuthids **Histioteuthidae **Psychroteuthidae *Lepidoteuthida **Lepidoteuthidae **Octopoteuthidae **Pholidoteuthidae *Ommastrephids **Ommastrephidae *Onychoteuthids **Onychoteuthidae *Thysanoteuthids **Thysanoteuthidae

References

External links

* Squid {{Squid-stub