Temporal range: Danian
Bathysoma lutkeni ("Lutken's Deep Body") is an extinct lamprid from the Danian epoch of Sweden, and is the second oldest lamprid known, after Nardovelifer of Campanian/Maastrichtian Italy. B. lutkeni has a disk-shaped body and an elongated head. It was originally described as a menid bony fish. Later, it was described as being a basal snake mackerel. Eventually, anatomical similarities with the Turkmenids were noted, and B. lutkeni is now regarded as an extremely basal lamprid.
-  "A new species of Mene (Perciformes: Menidae) from the Paleocene of South America, with notes on paleoenvironment and a brief review of menid fishes."
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