Armhook Squid is the collective common name of a family of squid with currently 19 known species within the family. All of these are medium in size and live across a wide range of waters. However, the animal prefers colder waters so the majority of the species are also endemic to the Antarctic Ocean, and colder portions of the North Atlantic.
Armhook Squid Physical Characteristics
All known varieties of Armhook Squid are physically extremely similar. They are also quite popular for several distinct deviations from the norm among squid. The suckers on their arms lie into four distinct rows. In fact, among the majority of squid species, two rows are typical.
Additionally, some of their suckers have developed into small hooks. In some species, both genders possess these hooks, while in others only the females do.
One species of Armhook Squid has also evolved to possess photophores which sit around the creature’s eyes.
Most species are a purple-brown or dark red in color.
Armhook Squid Behavior and Diet
Most species of Armhook Squid prefer to inhabit the area near continental shelves and stay within the pelagic zone of their native ocean. Depending upon the region, however, this zone of habitation may extend as deep as 14,764 ft (400 m).
They tend to remain in deeper waters during the day, preferring darkness. At night, they will often migrate to the surface where they will feed upon a variety of small fish and crustaceans. They sometimes even engage in cannibalism when prey is scarce.