Crown Structure of the Maxillary Molars in the Japanese Shrew Mole, Urotrichus talpoides (Insectivora, Talpidae)
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概要
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The maxillary first and second molars (M<SUP>1</SUP> and M<SUP>2</SUP>) in the Japanese shrew mole, <I>Urotrichus talpoides</I>, were investigated using an odontometrical approach. The mesiodistal crown diameter was larger in M<SUP>1</SUP> than in M<SUP>2</SUP>, while the buccolingual diameter of M<SUP>1</SUP> was nearly equal to that of M<SUP>2</SUP>. M<SUP>2</SUP> was more compressed mesiodistally than M<SUP>1</SUP>. M<SUP>1</SUP> had a large distal triangle on the stylar shelf. The mesial triangle of M2 was slightly larger than the distal triangle. Despite being smaller than M<SUP>1</SUP>, M<SUP>2</SUP> was less variable than M<SUP>1</SUP> in terms of size. The distal triangle of M<SUP>1</SUP> and the mesial triangle of M<SUP>2</SUP> were well developed, and thus this area, which corresponds to the inflection point of the maxillary dental arch, was most likely the center of an occlusal function.
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