Familial agenesis of mandibular first molars in Japanese macaques (Macaca fuscata)

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概要

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• We report in this paper two unusual cases of M1 agenesis recently discovered in Japanese macaques (Macaca fuscata). Molar agenesis is the congenital absence of molars. In general, molar agenesis occurs from the posterior molars. In most cases, missing teeth are third molars. Second molars may occasionally be absent in addition to the third molars. However, the congenital absence of first molars is hardly observed in humans, and to our knowledge, no case has been reported in other primates. In addition to the rareness of first molar agenesis, the present cases in M. fuscata are also quite unusual, because the posterior molars (M2 and M3) were completely preserved in contrast to the ordinary pattern of molar reduction. Interestingly, the two cases of the present study were observed in a single maternal lineage (a mother and her son), suggesting that M1 agenesis in these Japanese macaques is genetically inherited.

• 日本人類学会の論文

著者

• KUNIMATSU Yutaka

  Primate Research Institute, Kyoto University

• Kunimatsu Yutaka

  Primate Research Institute Kyoto University

• YAMAMOTO AYUMI

  Nursing Course, School of Medicine, Gifu University, Gifu

関連論文

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• Hominoid fossils discovered from Chiang Muan, northern Thailand : the first step towards understanding hominoid evolution in Neogene Southeast Asia
• An additional specimen of a large-bodied Miocene hominoid from Chiang Muan, northern Thailand
• Familial agenesis of mandibular first molars in Japanese macaques (Macaca fuscata)
• Catarrhines from the Middle Miocene (ca. 14.5Ma) of Kipsaraman, Tugen Hills, Kenya
• A Revision of the Hypodigm of Nyanzapithecus vancouveringi
• Familial agenesis of mandibular first molars in Japanese macaques (Macaca fuscata)
• Postcranial bones of infant Nacholapithecus: ontogeny and positional behavioral adaptation

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