Anisosiren was an early sea cow from the Middle Eocene of Hungary.
Location Fossils of Anisosiren are known from the Eocene deposits in Hungary.L. Kordos. 1979. Major finds of scattered fossils in the palaeovertebrate collection of the Hungarian Geological Institute. Relationes Annuae Instituti Geologici Publici Hungarici 1977:313-326.L. Kordos. 2002. Eocene sea cows (Sirenia, Mammalia) from Hungary. Fragmenta Palaeontologica Hungarica 20:43-48
See also Evolution of sirenians
References