Gusev A.E., Tiunov M.P.
В журнале Biology Bulletin
Год: 2021 Том: 48 Номер: 8 Страницы: 1358–1366
The shape variability of the chewing surface of the third lower premolar (p3) was analyzed in modern members of the Northern Pika (Ochotona hyperborea). The variability in the three main features characterizing the tooth shape was revealed: the visual position of the isthmus connecting the anteroconid and the posteroconid, and separately the shapes of both the anteroconid and the posteroconid. A combinatory matrix showing the distribution of the three morphotypes of the p3 chewing surface was developed based on their distinguishing features. Both the northern and southern parts of the pika’s distribution area are dominated by individuals differing in the p3 morphotypes.
