Specimens caught in daytime, about two days ago. Tow depth was about 300 m, East of Tierra del Fuego.
The species is difficult to distinguish on the photograph, as not all important characters are visible.
However, if they have a long dorsal [dorsal-fin base more than half of body length] and anal fin they really belong to Idiacanthus.
Two species are known from the South Atlantic (and adjacent Southern Ocean), I. atlanticus and I. fasciola. If the dorsal-fin origin is behind the pelvic-fin origin (and there are 19-23 photophores from pelvic-fin origin to anal-fin origin), it would be I. atlanticus; if the dorsal-fin origin is in advance of the pelvic-fin origin (and 14-16 photophores from pelvic-fin origin to anal-fin origin), it would be I. fasciola.
Judging from the collecting locality, Idiacanthus atlanticus would be more probable as I. fasciola prefers tropical and warm temperate water.
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