Interspecific reciprocal hybrids between Mesocricetus auratus and M. newtoni

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Abstract
Our previous research (Raicu & Bratosin, 1966; Raicu, Hamar, Bratosin & Borsan, 1967) has shown that the Romanian hamster (Mesocricetus newtoni, 2n 38) is a well-established species, differing considerably from the Syrian hamster and from other hamster species. The species is spreading in the south of Romama, especially in Dobrudja, and in Bulgaria. Its spreading area is completely isolated from the spreading area of all other species of Mesocricetus. The preferred biotops are uncultivated fields, dry steppes and fields cultivated with fodder plants. The Romanian hamster reveals important differences in the number and structure of the autosomes and in the degree of homology and presence of chiasmata in the heterosomes.

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