The morphology and placement relative to the orbit, of the preorbital fossa in some 30 local samples of Old World Hipparion is discussed. The fossa varies within limits in and between samples, as do features of the limbs and teeth. The fossa is a useful taxonomic character at the specific, less so at the supraspecific, level. Woodburne and Bernor's (1980) supraspecific groups of Hipparion, proposed on parameters of the fossa, are partly reconciled with species or groups of species defined mainly on dental morphology and limb proportions. All the horses here considered belong in the single genus Hipparion as defined on the teeth.--Journal abstract.

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