Theriologia Ukrainica
(former Proceedings of the Theriological School)

ISSN 2616-7379 (print) ISSN 2617-1120 (online)

2019 Vol. 17 Contents of volume >>>

download pdfRekovets, L. I., Kovalchuk, O. M., Demeshkant, V. D., Shevchenko, L. S. Enamel ultrastructure of lower molars of the red squirrel Sciurus vulgaris (Rodentia, Mammalia) from different populations in Ukraine. Theriologia Ukrainica. 2019. Vol. 17: 60-68.



Enamel ultrastructure of lower molars of the red squirrel Sciurus vulgaris (Rodentia, Mammalia) from different populations in Ukraine


Rekovets, L. I., Kovalchuk, O. M., Demeshkant, V. D., Shevchenko, L. S.


Wroclaw University of Environmental and Life Sciences (Wroclaw, Poland)
National University of Life and Environmental Sciences of Ukraine (Kyiv, Ukraine)
National Museum of Natural History, National Academy of Sciences of Ukraine (Kyiv, Ukraine)


Theriologia Ukrainica. 2019. Vol. 17: 60-68.




English, with Ukrainian extended summary, titles of tables, captures to figs, and references


The second lower molars of the red squirrel Sciurus vulgaris from different regions of Ukraine were examined in order to search for additional features to study the variability and clarify the subspecies status of its individual populations. Generally accepted methods were used for studying the enamel ultrastructure. It is established that the tooth enamel of the red squirrel has a layered structure and is represented by different types (radial, HSB and PLEX), which are also characteristic for other species of rodents. The arrangement of crystalline prisms of the radial layer in the IPM matrix is the main distinguishing feature of the morphological variability of enamel on main tooth conids. In various regional populations of the species, they act as an indicator of the adaptability of the teeth and their functionality as a single structure. This was reflected in differences in the thickness ratio of the radial layer and HSB, especially between the metaconid and the entoconid. The development of HSB is usually associated with greater functional load. Squirrel populations in the northern part of Ukraine have a relatively thick HSB layer, while those from central and southern parts of the country have a more strongly developed radial layer. According to these features, the Crimean populations are close to those from southern Ukraine and differ a bit from the Altai subspecies Sciurus vul-garis exalbidus, which was introduced into the Crimea in the first half of the twentieth century. It is assumed that the enamel ultrastructure as a morphological character has changed in the process of adapting of squirrels to new conditions. The distinguishing character of the enamel structure of Altai populations of the Teleut squirrel is that the cells of the radial layer on the hypoconid and protoconid are not filled by prisms. The tooth enamel ultrastructure of the Eurasian red squirrel cannot be an independent morphological character for their intraspecific differentiation. However, it can be successfully used in combination with other characters (e.g. fur coloration, craniometrical data), as well as the results of special molecular studies.


Sciurus vulgaris, taxonomy, teeth, enamel, prisms, Ukraine.



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