Oegopsida

Oegopsida is an order of marine cephalopods belonging to the subclass Oegopsina. These are a diverse group of squid characterized by certain anatomical features, most notably the complete absence of internalidia. Instead, their eyes are open to the sea, a defining characteristic that gives them their scientific name. Oegopsids are found in all the world's oceans, from tropical to polar waters, and inhabit a wide range of depths, from the surface to the abyssal zone.

This order encompasses a significant number of families and species, including many of the larger and more familiar squid. They typically possess ten arms, with two being longer tentacles that are often used for capturing prey. Their mantle is muscular and elongated, and they move through the water using jet propulsion by expelling water from their siphon. Many oegopsids are predators, feeding on fish, crustaceans, and other squid. Reproduction in oegopsids varies, but many species release large numbers of eggs, and larval development can occur in the plankton. Some oegopsid species are of commercial importance, while others are poorly understood due to their deep-sea habitats.