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Bathysoma is an extinct genus of marine Lampriformes Actinopterygii from the early-mid Paleocene. It contains a single species, B. lutkeni from Sweden. Its fossils are common in exposures of the Danian København Limestone Formation at Limhamns kalkbrott, one of the largest quarries in northern Europe . A single specimen is also known from an erratic boulder from the Selandian Lellinge Greensand Formation of southern Sweden.
It is the second oldest lampriform known, after Nardovelifer of Campanian/Maastrichtian Italy. B. lutkeni has a disk-shaped body and an elongated head. It was originally described as a Mene bony fish. Later, it was described as being a basal snake mackerel.[1] "A new species of Mene (Perciformes: Menidae) from the Paleocene of South America, with notes on paleoenvironment and a brief review of menid fishes." Eventually, anatomical similarities with the Turkmenidae were noted, and B. lutkeni is now regarded as an extremely basal lamprid.
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