Tooth Development and Replacement in the Japanese Greater Horseshoe Bat, Rhinolophus ferrumequinum nippon(COMMUNICATION)(Developmental Biology)

概要

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The dental formula of the deciduous teeth in Rhinolophus ferrumequinum nippon was i1/2 c1/1 p2/3x2 = 20. All the germs of deciduous teeth were present in the fetuses of 7-8 weeks. The deciduous teeth, exclusive of the p_3, attained their maximal size at 9-10 weeks, and then odontoclasts appeared in the dental pulp and began to resorb the dentin. The resorption and exfoliation of the teeth have completed at birth. The typical sequence of resorption of the deciduous teeth was i_1, i_2, C_1, c^1, p^2, p_2, i^2, p^4, P_4. On the other hand, the p_3 appeared late, developed slowly, and was remained in a small size, while the tooth germ of the P_3 was degenerating. The permanent teeth began to erupt at birth, and the usual sequence of their eruption was I_1, I_2, C^1, C_1, P_4, P^4, (P_2, M_1, M_2, M^1, M^2), M_3, M^3, (I^2, P^2, p_3). The incidence of lack of the p_3 was 13.2, 5.3 and 5.3% for the left, right and both sides of the jaw, respectively. Such a congenital abnormality suggests that the p_3 is genetically undergoing a process of degeneration.
社団法人日本動物学会の論文
1992-04-15