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Placodont remains (Sauropsida, Sauropterygia) from the Triassic of Hungary (Transdanubian Range and Villány Mountains)
Palaeobiodiversity and Palaeoenvironments ( IF 1.4 ) Pub Date : 2020-08-27 , DOI: 10.1007/s12549-020-00432-5
Kinga Gere , Torsten M. Scheyer , László Makádi , Attila Ősi

New placodont remains from the Triassic of Hungary are described here. They come from two different tectonic units: the Transdanubian Range Unit representing Alpine type sedimentary basins and the Villány-Bihar Unit that was part of the southern passive margin of the European Plate during the Triassic. The fossils came from four stratigraphic levels with the oldest specimen, a maxilla fragment found in the upper Anisian of Forrás Hill, near Felsőörs (Transdanubian Range). Based on dental morphology, the specimen is referred to here as Paraplacodus broilii. This site is similar in age to the Monte San Giorgio (Switzerland and Italy) locality. A Carnian occurrence of placodonts from this tectonical unit is a dentary fragment and two isolated teeth referred to here as Placochelys placodonta. The youngest specimen from this unit is a placochelyid tooth fragment from the Rhaetian of the Keszthely Mountains (Transdanubian Range). The richest assemblage of new placodont remains is from the Ladinian of the Villány Mountains, southern Hungary. Cranial elements are referred to here as Cyamodus sp. Teeth from this site are similar to that of Cyamodus sp. described from Slovenia, and both assemblages are among the last occurrences of the genus in the European Triassic. The Villány site is considered as a gap locality because of the rarity of Ladinian placodont occurrences in the German-Alpine sedimentary basins.



中文翻译:

匈牙利三叠纪(Transdanubian山脉和Villány山)的Placodont遗骸(Sauropsida,Sauropterygia)

这里描述了来自匈牙利三叠纪的新的斑纹遗骸。它们来自两个不同的构造单元:代表阿尔卑斯型沉积盆地的跨丹布努山脉单元和三叠纪期间属于欧洲板块南部被动缘的维兰尼-比哈尔单元。这些化石来自四个地层,最古老的标本是在Felsőörs(Transdanubian Range)附近的ForrásHill上部Anisian中发现的上颌碎片。基于牙齿的形态,该标本在这里被称为“ Paraplacodus broilii”。该站点的年龄与蒙特圣乔治(瑞士和意大利)地区相似。来自该构造单元的Carnian斑牙是齿系碎片和两个孤立的牙齿,这里称为Placochelys placodonta。该单元中最年轻的标本是来自凯斯特海伊山脉(跨丹努比亚山脉)的Rhaetian的pl齿科牙齿碎片。新的placodont遗迹中最丰富的组合来自匈牙利南部Villány山的拉丁尼亚人。颅骨要素在本文中称为Cyamodus sp。来自此站点的牙齿与Cyamodus sp。的牙齿相似。来自斯洛文尼亚的描述,这两种组合都是欧洲三叠纪属的最后一次出现。由于在德国-高山沉积盆地中拉第尼古生物出现的稀有性,因此将Villány站点视为间隙位置。

更新日期:2020-08-27
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