コヤス カズヒロ   KOYASU Kazuhiro
  子安 和弘
   所属   歯学部 解剖学講座
   職種   講師
言語種別 英語
発行・発表の年月 2008/09
形態種別 学術雑誌
査読 査読あり
標題 Fetal growth and development of the coypu (Myocastor coypus): Prenatal growth, tooth eruption, and cranial ossification.
執筆形態 共著
掲載誌名 Mammalian Biology
出版社・発行元 Elsevier
巻・号・頁 73(5),pp.350-357
著者・共著者 Sone, K., Koyasu, K., Kobayashi, S., Oda, S.-i.
概要 We examined the fetal growth and development of the coypu (Myocastor coypus), a member of the Caviomorpha that produces extremely precocial young. Analyses of 69 fetuses derived from the latter half of the prenatal period (60–125 days of gestation) focused on external feature growth and development, tooth eruption, and cranial ossification. There were four developmental stages based on morphological characteristics; major external changes predominated over somatic growth in the early stages by 100–105 days of gestation, whereas the last stage was a time of rapid somatic growth. Growth rate was greater in hind foot length (4.3) than in fore foot length (3.4). Soft X-ray photos from 120 to 125 days of gestation show that the incisors, premolars, and first molars were completely calcified, and the second molars were present in the alveolus but not completely calcified.
DOI 10.1016/j.mambio.2007.04.006
ISSN 1616-5047