Cutting blade dentitions in squaliform sharks form by modification of inherited alternate tooth ordering patterns.
Cutting blade dentitions in squaliform sharks form by modification of inherited alternate tooth ordering patterns.
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DOI：
10.1098/rsos.160385
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发表时间：
2016-11
影响因子：
3.5
通讯作者：
Smith MM
中科院分区：
文献类型：
--
作者：
Underwood C;Johanson Z;Smith MM
角鲨是最具特色的鲨鱼分支之一。许多成年的角形目有刃状的牙齿，要么在两个颚上，要么局限于下颚，形成一个连续的，沿着沿着颚缘的锯齿状的刃。这些牙齿被替换为一个单一的单位和继任者的牙齿缺乏交替安排存在于其他板鳃类。对鳞形目和一个相关的外类群（Pristiophoridae）胚胎的显微CT扫描显示，鳞形目的齿系模式代表了在其他分支中看到的牙齿替换的高度修改版本。角鲨胚胎的牙齿以交替的模式排列，连续的齿排包含近端添加的额外的牙齿。沿着颌骨的牙齿产生的不同步时间和出生前的牙齿缺失导致牙齿排列成倾斜的牙齿组，其中包含后续排的牙齿;这些牙齿在个体发育期间与颌骨边缘平行，因此成年角鲨具有功能性牙齿排，包括连续发育排的倾斜堆叠的牙齿。在更强烈的异齿角鲨形类中，最初的胚胎下齿发育成成年角鲨的斜功能组，不需要形成，随后失去，牙齿排列在最初的交替模式中。
The squaliform sharks represent one of the most speciose shark clades. Many adult squaliforms have blade-like teeth, either on both jaws or restricted to the lower jaw, forming a continuous, serrated blade along the jaw margin. These teeth are replaced as a single unit and successor teeth lack the alternate arrangement present in other elasmobranchs. Micro-CT scans of embryos of squaliforms and a related outgroup (Pristiophoridae) revealed that the squaliform dentition pattern represents a highly modified version of tooth replacement seen in other clades. Teeth of Squalus embryos are arranged in an alternate pattern, with successive tooth rows containing additional teeth added proximally. Asynchronous timing of tooth production along the jaw and tooth loss prior to birth cause teeth to align in oblique sets containing teeth from subsequent rows; these become parallel to the jaw margin during ontogeny, so that adult Squalus has functional tooth rows comprising obliquely stacked teeth of consecutive developmental rows. In more strongly heterodont squaliforms, initial embryonic lower teeth develop into the oblique functional sets seen in adult Squalus, with no requirement to form, and subsequently lose, teeth arranged in an initial alternate pattern.
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角鲨目的分子系统发育和鲨鱼生物发光的首次出现。
影响因子：
3.4
作者：
Straube N;Li C;Claes JM;Corrigan S;Naylor GJ
通讯作者：
Naylor GJ
影响因子：
2.9
作者：
Jussila, Maria;Yanezl, Xenia Crespo;Thesleff, Irma
通讯作者：
Thesleff, Irma
影响因子：
4.6
作者：
Juuri, Emma;Jussila, Maria;Thesleff, Irma
通讯作者：
Thesleff, Irma
影响因子：
2.9
作者：
Smith, MM
通讯作者：
Smith, MM
DOI：
10.1002/jez.b.21272
发表时间：
2009-06-15
影响因子：
2.2
作者：
Smith, Moya M.;Fraser, Gareth J.;Mitsiadis, Thimios A.
通讯作者：
Mitsiadis, Thimios A.