来自埃及西部沙漠达赫拉地层海相 Maastrichtian 的首次描述的 Onchopristis Stromer, 1917, (Elasmobranchii: †Onchopristidae)

IF 2.2 4区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Journal of African Earth Sciences Pub Date : 2024-09-07 DOI:10.1016/j.jafrearsci.2024.105415
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引用次数: 0

摘要

从埃及达赫拉地层的海相马斯特里赫特期采集到一个特殊大小(TL = 146 厘米)的特殊肥大蝙蝠状喙体和四个残缺的喙齿。无论是宏观特征(喙的中央部分覆盖着一层 "木质 "层,腹面的基部有皮质小齿)还是微观特征(喙的中央部分有棋盘格状软骨,外围区域有层状软骨),都表明该喙属于 Stromer 1917 年发现的 Onchopristis 属的大型标本。由于没有完整的喙齿,因此无法确定一个新物种。尽管如此,所描述的发现首次表明,Onchopristis 属一直在北非的极海洋地区生存到白垩纪末期。
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The first described Onchopristis Stromer, 1917, (Elasmobranchii: †Onchopristidae) from the marine Maastrichtian of Dakhla Formation, Western Desert, Egypt

An exceptional hypertrophic batoid rostrum of exceptional size (TL = 146 cm) and four fragmentary rostral teeth collected from the marine Maastrichtian of the Dakhla Formation, Egypt. Both the macroscopic aspects (with the presence of a "wood-like" layer that covers the central part of the rostrum and the presence of skin denticles at the bases of the ventral face) and microscopic characters (presence of tessellated cartilage in the central part of the rostrum and of laminated cartilage in the peripheral areas of it) demonstrate that the rostrum belongs to a large specimen of the genus Onchopristis Stromer, 1917. The absence of complete rostral teeth prevents the establishment of a new species. Nonetheless, the described finds demonstrate, for the first time, that the genus Onchopristis persisted in the euryhaline areas of North Africa until the end of the Cretaceous.

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来源期刊
Journal of African Earth Sciences
Journal of African Earth Sciences 地学-地球科学综合
CiteScore
4.70
自引率
4.30%
发文量
240
审稿时长
12 months
期刊介绍: The Journal of African Earth Sciences sees itself as the prime geological journal for all aspects of the Earth Sciences about the African plate. Papers dealing with peripheral areas are welcome if they demonstrate a tight link with Africa. The Journal publishes high quality, peer-reviewed scientific papers. It is devoted primarily to research papers but short communications relating to new developments of broad interest, reviews and book reviews will also be considered. Papers must have international appeal and should present work of more regional than local significance and dealing with well identified and justified scientific questions. Specialised technical papers, analytical or exploration reports must be avoided. Papers on applied geology should preferably be linked to such core disciplines and must be addressed to a more general geoscientific audience.
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