A New Diapsid with a Unique Tooth Structure from the Middle Triassic (Ladinian) of Germany
A New Diapsid with a Unique Tooth Structure from the Middle Triassic (Ladinian) of Germany
复制标题
德国中三叠世（拉丁纪）具有独特牙齿结构的新双孔动物
DOI：
10.1080/02724634.2021.1929268
复制
发表时间：
2021
影响因子：
1.4
通讯作者：
Schoch
中科院分区：
文献类型：
--
作者：
Sobral;Schoch
中三叠世是爬行动物进化史上的一个重要时期，因为正是在这段时间里，许多现代群体起源并最初多样化。在这种情况下，丰富的沉积物的拉丁时代的埃尔富特组在德国南部发挥了重要作用，在阐明爬行动物的多样性在此期间。在这里，我们提出了一个有趣的记录爬行动物与一个不寻常的齿系。该材料包括左齿骨的碎片。牙齿紧密间隔，有凿子状的牙冠，舌后延伸的顶点邻接连续牙齿的顶点，形成连续的切割边缘。对颌骨碎片的微型计算机断层扫描显示，牙齿的牙根已经扩张，并位于一个开放的浅槽上。Meckelian运河是部分开放的舌和第二个渠道的下齿槽神经和动脉平行延伸it.Although保存的解剖特征的材料是不够的精确的系统发育的位置，结构的强大的齿和它的牙齿类似于那些的一些lepidosaurs和某些早期中生代海洋双孔类。牙齿的独特形态，加上明显缺乏牙齿磨损，使得很难评估其功能意义。有趣的是，具有相似牙齿形态的灭绝四足动物来自代表淡水和咸水古环境的地层，这可能是未来形态功能评估的额外证据。
The Middle Triassic was an important time in the evolutionary history of reptiles because it was during this time that many modern groups originated and initially diversified. In this context, the rich fossiliferous deposits of the Ladinian-age Erfurt Formation in southern Germany play an important role in elucidating reptilian diversity during this interval. Here we present an interesting record of a reptile with an unusual dentition. The material comprises a fragment of a left dentary. The teeth are tightly spaced and have chisel-shaped crowns, with the posterolingually extending apices abutting those of the successive teeth and forming a continuous cutting edge. Micro-computed tomography scanning of the jaw fragment revealed the teeth have expanded roots and sit on an open, shallow groove. The Meckelian canal is partially open lingually and a second canal for the inferior alveolar nerve and artery extends parallel to it. Although the preserved anatomical features of the material are insufficient for precise phylogenetic placement, the structure of the robust dentary and its teeth resembles those of some lepidosaurs and certain early Mesozoic marine diapsids. The distinctive morphology of the teeth, combined with the apparent lack of tooth wear, makes it difficult to assess their functional significance. It is interesting that extinct tetrapods with similar tooth morphologies come from strata representing freshwater and brackish-water paleoenvironments, which may serve as an additional line of evidence for future Morpho-functional assessments.
登录
查看更多内容
影响因子：
4.6
作者：
G. Sobral;T. Simões;R. Schoch
通讯作者：
G. Sobral;T. Simões;R. Schoch
DOI：
10.1111/j.1096-3642.1980.tb00852.x
发表时间：
1980-01-01
影响因子：
2.8
作者：
EVANS, SE
通讯作者：
EVANS, SE
Adelospondyli 目：石炭纪 lepospondyl 两栖类
DOI：
--
发表时间：
1991
期刊：
Transactions of the Royal Society of Edinburgh: Earth Sciences
影响因子：
--
作者：
S. M. Andrews;R. Carroll
通讯作者：
R. Carroll
关于爬行动物的初级分类。
影响因子：
56.9
作者：
H. Osborn
通讯作者：
H. Osborn
影响因子：
8.1
作者：
R. Estes
通讯作者：
R. Estes