The ultrastructure of the tooth enamel of small Equus of the “tarpan” group and their possible phylogenetic connections

The paper presents the results of a comparative analysis ultrastructure tooth enamel (incisors, premolars and molars) in representatives morphologically (and possibly phylogenetically) similar forms small horses. These are both extinct tarpan – Equus gmelini from various sites early Holocene Ukraine (Myrne, Kamiana Mohyla Hirzhevo) modern konik polski E. przewalskii, European wild ass hydruntinus. Morphology prisms different layers its relative relationships taxa were thoroughly described. data obtained form tables graphs, with appropriate statistical processing thereof, show morphological similarity remains sites, their to Przewalski’s horse. However, differs significantly other groups studied. In equines, radial varieties (types І, ІІ ІІІ) have evolutionary tendencies strengthen first second types hydroxyapatite prisms, while reducing share IPM matrix structure. turn, incisors is characterized by lamellar HSB uniserial type.