Taxa named by Othenio Abel

left|thumb|Drawing of skeleton Protosiren is an extinct early genus of the order Sirenia. Protosiren existed throughout the Lutetian to Priabonian stages of the Middle Eocene. Fossils have been found in the far-flung locations like the United States (South Carolina, North Carolina and Florida), Africa (Egypt), Europe (France, Germany and Hungary) and Asia (India and Pakistan).

left|thumb|Drawing of skeleton. left|thumb|E. libyca and an extant manatee by Charles R. Knight, 1907 left|thumb|Size of Eosiren (purple) compared to other Eocene sirenians and a human. Eosiren is an extinct genus of sea cow that lived during the Late Eocene (later Priabonian) to Early Oligocene (Rupelian). Several fossils have been found in Egypt. It seems like the species E. abeli were contemporaneous with Protosiren and Eotheroides. Like them, Eosiren closely resembled modern sirenians, with the primary differences being somewhat larger innominates and the presence of thigh bones.