This family was described from three individuals: Two juveniles about 50 mm ML and a paralarva of 19 mm ML. Virtually nothing is known about the biology of these squid; they have never been observed alive. The most distinctive features of these squid are very large terminal fins, short tentacles with numerous sucker series and arms and tentacles with slender, elongate tips that are vermiform in appearance.
photograph copyright © 1998, Richard E. Young
From Vecchione and Young (1998):
Vecchione, M. and R. E. Young. 1998. The Magnapinnidae, a newly discovered family of oceanic squids (Cephalopoda; Oegopsida). South African Journal of Marine Science, 20: 429-437.)