An enigmatic ‘conchostracan’ fauna in the eastern Dead Sea region of Jordan: First records of Rossolimnadiopsis Novozhilov from the Early Triassic Ma'in Formation
An enigmatic ‘conchostracan’ fauna in the eastern Dead Sea region of Jordan: First records of Rossolimnadiopsis Novozhilov from the Early Triassic Ma'in Formation
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DOI：
10.1016/j.palaeo.2016.11.047
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发表时间：
2017-01
期刊：
影响因子：
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通讯作者：
F. Scholze;A. A. Hamad-A.;J. Schneider;V. Golubev;A. Sennikov;S. Voigt;D. Uhl
中科院分区：
文献类型：
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作者：
F. Scholze;A. A. Hamad-A.;J. Schneider;V. Golubev;A. Sennikov;S. Voigt;D. Uhl
对约旦死海东部地区晚二叠世-早三叠世沉积序列进行了叶甲纲（甲壳纲：鳃足纲）调查。虽然它们在中晚二叠世Umm Irna组的出现无法得到证实，但上覆的Ma'in组包含一个动物群，包括Rossolimnadopsis Novozhilov和其他迄今为止分类学上尚未确定的叶肢介。这是一个新物种，Rossolimnadiopsis hanskerpinov。sp.，被描述和描绘。它显示了一个非常独特的凹弯曲的背缘和一个升高的，向外弯曲的半圆形凸缘。产于早三叠世Ma'in组（Nimra段）的深灰色层状湖相粉砂岩中。根据文献资料，Rossolimnadiopsis以前只记录在俄罗斯中部莫斯科向斜的两个地点。除约旦外，该属在印度也有发现，可能在德国也有。所有这些事件似乎都局限于从晚二叠世到早三叠世的狭窄地层间隔。
The Late Permian–Early Triassic sedimentary succession in the eastern Dead Sea Region of Jordan was surveyed for conchostracans (Crustacea: Branchiopoda). Whereas their occurrence in the Middle–Late Permian Umm Irna Formation could not be confirmed, the overlying Ma'in Formation contained a fauna comprisingRossolimnadiopsisNovozhilov and other, thus far, taxonomically undetermined conchostracans. Here, a new species,Rossolimnadiopsis hanskerpinov. sp., is described and figured. It shows a very distinctive concavely curved dorsal margin and an elevated, outwardly curved semi-circular flange.Rossolimnadiopsis hanskerpinov. sp. occurs in dark gray, laminated, lacustrine, siltstones of the Ma'in Formation (Nimra Member), which is considered to be of Early Triassic age. Based on literature data,Rossolimnadiopsiswas previously recorded only from two localities in the Moscow syncline in Central Russia. In addition to Jordan, the genus has been identified in India and possibly in Germany. All these occurrences seem to be restricted to a narrow stratigraphic interval ranging from the Late Permian to the Early Triassic.