Ontogenetic transition from unicuspid to multicuspid oral dentition in a teleost fish: Astyanax mexicanus, the Mexican tetra (Ostariophysi: Characidae)
Ontogenetic transition from unicuspid to multicuspid oral dentition in a teleost fish: Astyanax mexicanus, the Mexican tetra (Ostariophysi: Characidae)
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硬骨鱼从单尖牙到多尖牙列的个体发育转变：Astyanax mexicanus，墨西哥四齿鱼（Ostariophy：Characidae）
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发表时间：
2005
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影响因子：
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通讯作者：
D. Stock
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作者：
J. Trapani;Yoshiyuki Yamamoto;D. Stock
硬骨鱼成年后的牙列表现出显着的多样性。考虑到第一代牙列的一致性，这种多样性就显得更加引人注目。很少有研究定量记录硬骨鱼广义的第一代牙列和专门的成年牙列之间的转变。我们通过测量从胚胎到 160 天龄的个体发育系列个体以及年龄未知的成体的牙列各个方面，研究了墨西哥四足动物 Astyanax mexicanus (Characidae) 的这种转变。第一代牙列及其直接后继者由骨外发育的小单尖牙组成。多尖牙首先出现在第二次牙齿替换事件中，并且源自单个牙胚，而不是多个圆锥形牙胚的融合。我们记录了从单尖牙到多尖牙的转变对应于牙胚发育位置（从骨外到骨内）和牙齿更换模式（从偶然到同时在颌象限内）的变化。此外，虽然最大的牙齿鳞片的尺寸与鱼的尺寸呈正异速生长，但向多尖牙的过渡伴随着牙齿尺寸的异常大幅增加。 (c) 2005 年伦敦林奈学会，《林奈学会动物学杂志》，2005 年，145，523-538。
Teleost fishes display a remarkable diversity of adult dentitions; this diversity is all the more remarkable in light of the uniformity of first-generation dentitions. Few studies have quantitatively documented the transition between generalized first-generation dentitions and specialized adult dentitions in teleosts. We investigated this transition in the Mexican tetra, Astyanax mexicanus (Characidae), by measuring aspects of the dentition in an ontogenetic series of individuals from embryos to 160 days old, in addition to adults of unknown age. The first-generation dentition and its immediate successors consist of small, unicuspid teeth that develop extraosseously. Multicuspid teeth first appear during the second tooth replacement event, and are derived from single tooth germs, rather than from the fusion of multiple conical tooth germs. We document that the transition from unicuspid to multicuspid teeth corresponds to a change in the location of developing tooth germs (from extraosseous to intraosseous) and in patterns of tooth replacement (from haphazard to simultaneous within a jaw quadrant). In addition, while the size of the largest teeth scales with positive allometry to fish size, the transition to multicuspid teeth is accompanied by an exceptionally large increase in tooth size. (c) 2005 The Linnean Society of London, Zoological Journal of the Linnean Society, 2005, 145, 523-538.