Plesippus Asianus Hippotigris Dolichohippus Onegar Hemionus Kraterohippus Kolpohippus Sterrohippus Neohippus
McKenna, M. C. & Bell, S. K., (eds.) 1997: Classification of mammals – above the species level.
–Columbia University Press, New York, 1997, xii-631
Prothero, D. R. & Schoch, R. M., (eds.) 1989: The evolution of perissodactyls.
--Oxford University Press, New York, New York & Oxford, England, 1989, ix-537