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Description
Bathysoma lutkeni is the second-oldest known lampridiform (e.g. the opah, ribbonfish, etc), dating back to the lower Paleocene of Sweden. It was once thought to be a menid moonfish, then a disk-shaped cutlassfish. Eventually, similarities between it and other fossil lampridiforms, such as those of the extinct family of Turkmenidae, were documented.

Description
Bathysoma lutkeni is the second-oldest known lampridiform (e.g. the opah, ribbonfish, etc), dating back to the lower Paleocene of Sweden. It was once thought to be a menid moonfish, then a disk-shaped cutlassfish. Eventually, similarities between it and other fossil lampridiforms, such as those of the extinct family of Turkmenidae, were documented.