Two species are recognized, M. canhami and M. kocki.
Phylogeny
A 2014 cladistic analysis of extinct sirenians recovered Miosiren as a close relative of Anomotherium in a separate subfamily within Trichechidae, Miosireninae.[2]
^M. Voss. 2014. On the invalidity of Halitherium schinzii Kaup, 1838 (Mammalia, Sirenia), with comments on systematic consequences. Zoosystematics and Evolution 90(1):87-93