The Middle Pleistocene site Steinheim an der Murr, Germany, yielded sparse fossil bone materials representing Equus hydruntinus, but a rich sample of the caballoid horse, E. steinheimensis. The latter taxon's bones were analysed and are shown here to be similar to other caballoids from the same and later time interval. Its taxonomic position is unclear, as is true for other Middle and Later Pleistocene horses.