Comparative analysis of male reproductive system and spermatozoa in cricetines from Peruvian Amazonia with special reference to their taxonomy and relationshipsстатья
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Аннотация:Description of male accessory glands, glans penis, bacula and spermatozoa for 175 adult cricetines from 2 localities of Peruvian Amazonia belonging to 11 species from 7 genera and 2 tribes (Oryzomyini and Sigmodontini) is given. These structures appear to be very similar. Some differences in size, proportion and form of vesicular, ampullary, bulbo-urethral, preputial and prostate glands probably do not reflect taxonomic specificity, but are related to the individual and physiological state of generative system. The differences in size and distribution of spines on the glaris penis surface in Oryzomys s.l. (5 species) and Neacomys (2 species) comparing with S. ucayalensis and N. squamipes and N. brasiliensis arose independently, thus their use in taxonomy of cricetines from Peruvian Amazonia is restricted. Despite the structural uniformity of bacula, some species specific traits have been found. By their size, proportions and structural details it is possible to identify species of small rice (O. microtis, O. trinitatis, O. capito, O. macconnelli, O. yunganus) and morphologycally very similar thorny N. spinosus, Neacomys sp. cricetines as well as larger species (N. squamipes and N. brasiliensis). The spermatozoon head in 9 species resembles in shape a battle-axe. Under the acrosome part in N. squamipes and N. brasiliensis there is a notch which is practically not present in other species. Comparison of the obtained data with those from literature sources allows to conclude that phylogenetically the South American cricetines are similar to each other and closely related to the North American species.