Bigfin squid

The bigfin squid is a group of rare deep-sea squid in the genus Magnapinna, family Magnapinnidae.

The bigfin squid is a group of rare deep-sea squid in the genus Magnapinna, family Magnapinnidae. They are known for their very long arms and tentacle filaments, large fin-like structures, and extreme deep-ocean habitat. They are among the deepest-living squid known to science.

Taxonomy

Bigfin squid are placed in the genus Magnapinna and the family Magnapinnidae. The genus name is Latin for “great fin,” referring to their unusually large fins.

Appearance and size

They are notable for long, slender arms and tentacle filaments, plus fins that extend most of the way along the mantle. Recorded individuals have been reported at more than 20 feet in total length, though exact size limits are uncertain.

Habitat and distribution

Bigfin squid live in very deep ocean waters and have been documented in multiple ocean basins worldwide. They are considered among the deepest-occurring squid, with sightings in the hadal zone.

Behaviour and diet

Because sightings are rare, their behaviour is not well understood. Available accounts suggest they may use their long filaments to capture prey such as small fish and crustaceans.