| Summary: | Discussion of the phylogenetic relations between <i>Plesippus</i>, <i>Allohippus</i>, and <i>Equus</i>. Descriptions and illustrations of 30 Equid extant and fossil species younger than 2 Ma. Particular attention is given to slender forms with short protocones usually referred to ‘<i>Equus altidens</i>’ from Süssenborn and Untermassfeld (Germany), Akhalkalaki and Dmanisi (Georgia), Pirro (Italy), Venta Micena (Spain) and Aïn Hanech (Algeria). Occurrence of Asinine features in fossil taxa from Africa, Greece, Mongolia, and North-Eastern Siberia. Supplementary Materials include additional discussions and photographs of fossils in particular from Süssenborn (especially those referred to <i>E. altidens</i> and <i>E. marxi</i> by Reichenau) and from Dmanisi from where a new species is described.
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