A New Archosauriform Reptile with Distinctive Teeth from the Middle Triassic (Ladinian) of Germany

A New Archosauriform Reptile with Distinctive Teeth from the Middle Triassic (Ladinian) of Germany
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德国中三叠纪(拉丁纪)一种具有独特牙齿的新主龙类爬行动物

DOI:
10.1080/02724634.2020.1764968
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发表时间:
2020
影响因子:
1.4
通讯作者:
Sobral
Sobral
中科院分区:
地球科学4区
文献类型:
--
作者:
Schoch;Sobral

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德国巴登-符滕贝格州韦尔贝格市Schumann采石场附近的Lower Keuper(中三叠世,Ladinian)的小型爬行动物遗骸,其独特的齿系代表了一个新的非初龙类初龙形分类群,Polymorphodon adorfi。它是通过各种颅齿自形症来诊断的,包括唇舌向扁平的上颌和牙齿牙冠的近中和远中隆突,具有大的、有点钩形的齿状突起,与牙冠的顶基中轴成不同的角度;前上颌骨具有长的、叶状的后背突,略长于元件体;在前上颌骨上存在突出的侧窝,位于外鼻孔窗的前腹侧;前上颌骨有五个轻微下弯的圆锥形牙齿;上颌骨的内侧表面在齿间板上方有明显的突出物;上颌骨和牙齿有明显的异齿牙列。系统发育分析恢复Polymorphodon adorfi在一个位置上的红鳄非洲,但在一个未解决的多分与派生的非主龙类主龙形,如原鳄科和Euparkeria capensi和与主龙类。Adorfi多形齿龙的上颚齿和齿状齿与其他非初龙类的初龙形龙不同,表明它们的饮食可能是杂食性的,这表明这些爬行动物的饮食习惯比以前假设的更加多样化。
Skeletal remains of a small reptile with a distinctive dentition from the Lower Keuper (Erfurt Formation; Middle Triassic, Ladinian) of the Schumann quarry near Eschenau, in the municipality of Vellberg in Baden-Württemberg, Germany, represent a new taxon of non-archosaurian archosauriforms,Polymorphodon adorfi. It is diagnosed by various craniodental autapomorphies, including mesial and distal carinae of labiolingually flattened maxillary and dentary tooth crowns with large, somewhat hook-shaped denticles aligned at distinct angle to apicobasal axis of tooth crown; premaxilla with long, leaf-shaped posterodorsal process that is slightly longer than body of element; presence of prominent lateral fossa on premaxilla anteroventral to external narial fenestra; premaxilla with five gently recurved, conical teeth; medial surface of maxilla with distinct ledge above the interdental plates; and maxilla and dentary with distinctly heterodont dentition. Phylogenetic analysis recoveredPolymorphodon adorfiin a position crownward ofErythrosuchus africanusbut in an unresolved polytomy with derived non-archosaurian archosauriforms such as Proterochampsidae andEuparkeria capensisand with Archosauria. The maxillary and dentary teeth ofPolymorphodon adorfidiffer from those of other non-archosaurian archosauriforms and indicate a different, possibly omnivorous diet, suggesting that these reptiles were more diverse in terms of feeding habits than previously assumed.
DOI: 10.1038/s41598-020-58883-x
发表时间: 2020-02
期刊: Scientific Reports
影响因子: 4.6
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DOI: --
发表时间: --
期刊: Science
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发表时间: 2009-02-01
影响因子: 2.8
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DOI: 10.1098/rspl.1903.0015
发表时间: 2008
影响因子: --
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