Oegopsida is one of the four 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.
In 2025, numerous other fossil beaks, comprising many newly-described genera and families, were identified from the Yezo Group, dating back to at least the earliest Cenomanian. This confirms that oegopsids were already a dominant component of Cretaceous seas and had diverged from the myopsids by this time. However, Yezoteuthis, the earliest described fossil oegopsid, was found to be a squid of uncertain affinities. which has been accepted by WoRMS.
Phylogeny
The following cladogram is based on a maximum likelihood phylogenetic tree from a 2021 study analyzing the mitogenomes and nuclear markers of Oegopsida: