Little is known about the feeding-behaviour of these squid. These species of squids are mainly identifiable by their long thin arms and specific colors. While their exact identity is unknown, all of the discovered specimens can be observed to have a brown-orange color body, translucent fins, near-white tentacles, and dark eyes. While they do appear similar to the larvae, no specimens or samples of the adults have been taken, leaving their exact identity unknown. Viewing close-ups of the body and head, it is apparent that the fins are extremely large, being proportionately nearly as big as those of bigfin squid larvae. Estimates based on video evidence put the total length of the largest specimens at 8 metres (26 ft) or more. This trait is caused by filament coiling of the tentacles, a trait that is rare among similar species. Most remarkable was the length of the elastic tentacles, which has been estimated at up to 15–20 times the mantle length. The appendages were also held perpendicular to the body, creating the appearance of strange "elbows". Uniquely among cephalopods, the arms and tentacles were of the same length and looked identical (similar to extinct belemnites). The specimens in the videos looked very distinct from all previously known squids. Currently, there are officially 3 known species of bigfin squid. The squid was found at a depth of 2,385 m (7,825 ft), and its size is currently being measured using paired lasers. On 9 November 2021, a video of a long-armed squid was captured at a ridge feature off the West Florida Escarpment by an ROV from the NOAAS Okeanos Explorer as part of the Windows to the Deep 2021 expedition. were made in the Great Australian Bight during towed camera and remote operated vehicle surveys in 20 respectively. On 11 November 2007, a new video of a long-arm squid was filmed off Perdido, a drilling-site owned by Shell Oil Company, located 200 statute miles or 320 km off Houston, Texas in the Gulf of Mexico. In May 2001, approximately ten minutes of crisp footage of a long-armed squid were acquired by ROV Tiburon, causing a flurry of attention when released. These videos did not receive any media attention most were brief and fairly blurry. Magnapinna pacifica Vecchione & Young, 1998.Magnapinna atlantica Vecchione & Young, 2006.
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