Oligocene fish of Europe

Megalolamna is an extinct genus of large mackerel shark that lived approximately 23.5 to 15 million years ago (Mya), from the Late Oligocene to the Middle Miocene epochs. Fossils belonging to this genus are known from the Americas, Europe and Japan, and have been documented in scientific literature since the late 19th century. It was in 2016 that the fossils were described as belonging to the same distinct taxon called M. paradoxodon. However, a 2024 study reveals that the taxon was already described indirectly in 1879 under the name Otodus serotinus, the only known species of this genus then

Oligolactoria is an extinct genus of boxfish that lived during the Rupelian epoch of the Middle Oligocene in Moravia, Czech Republic. The genus contains only one species, Oligolactoria bubiki. It strongly resembles modern cowfish of the genus Lactoria.