Kieser J A, Klapsidis C, Law L, Marion M
Departments of Oral Pathology, School of Dentistry, Witwatersrand University, Johannesburg 2050, South Africa.
Department of General Anatomy, School of Dentistry, Witwatersrand University, Johannesburg 2050, South Africa.
J Morphol. 1993 Nov;218(2):195-201. doi: 10.1002/jmor.1052180208.
Patterns of tooth replacement in the Nile crocodile Crocodylus niloticus were evaluated in the lateral radiographs of six dried skulls of 1-year-old individuals. Additionally, the ontogeny of the succession of teeth in this species was investigated in four embryos and a hatchling, which were serially sectioned. Three-dimensional, computer-generated reconstructions of these individuals suggested that there was a regular pattern of odontogenic progression. Three morphogenetic zones could be identified in each of the age classes: an incisor, a canine, and a molar region. It was thus concluded that the Nile crocodile is hetero- rather than homodont. Zahnreihen, or tooth rows, with a periodicity of one were easily identified. © 1993 Wiley-Liss, Inc.
通过对六个一岁尼罗鳄（Crocodylus niloticus）干燥头骨的侧位X光片进行评估，研究了其牙齿替换模式。此外，对四个胚胎和一只幼鳄进行了连续切片，以研究该物种牙齿更替的个体发育过程。对这些个体的三维计算机重建显示，牙齿发生过程存在规律模式。在每个年龄组中均可识别出三个形态发生区：门齿区、犬齿区和臼齿区。因此得出结论，尼罗鳄是异形齿而非同形齿。易于识别出具有一个周期的齿列。© 1993威利-利斯出版公司。
