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Bigfin squid
The bigfin squids are a group of rarely seen cephalopods with a distinctive morphology. They are placed in the genus ''Magnapinna'' and family Magnapinnidae. Although the family is known only from larval, paralarval, and juvenile specimens, some authorities believe the adult creature have also been seen; several videos have been taken of animals nicknamed the "long-arm squid", which appear to have a similar morphology. Since none of the seemingly adult specimens have ever been captured or sampled, it remains uncertain if they are the same genus, or only distant relatives.
== Physical specimens ==
The first record of this family comes from a specimen (''Magnapinna talismani'') caught off the Azores in 1907.〔Fischer, H. & L. Joubin (1907): Expéditions scientifiques du Travailleur et du Talisman. ''Céphalopodes'' 8: 313–353.〕 However, due to the damaged nature of the find, very little information could be discerned and it was classified as a mastigoteuthid, first as ''Chiroteuthopsis talismani''〔 and later as ''Mastigoteuthis talismani''. In 1956, a similar squid (''Magnapinna'' sp. C) was caught in the South Atlantic, but little was thought of it at the time. The specimen was illustrated in Alister Hardy's ''The Open Sea'' (1956), where it was identified as ''Octopodoteuthopsis''.〔Hardy, A.C. (1956): ''The Open Sea: Its Natural History''. Collins, London.〕
During the 1980s, two more mature specimens were found in the Atlantic (''Magnapinna'' sp. A), and three more were found in the Pacific (''Magnapinna pacifica''). Researchers Michael Vecchione and Richard Young were the chief investigators of the finds, and eventually linked them up to the two previous specimens, erecting the family Magnapinnidae in 1998, with ''Magnapinna pacifica'' as the type species. Of particular interest was the very large fin size, up to 90% of the mantle length, that was responsible for the animals' common name.
A single specimen of a fifth species, ''Magnapinna'' sp. B, was collected in 2006. ''Magnapinna'' sp. A was described as ''Magnapinna atlantica'' in 2006.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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