A new freshwater lonchidiid hybodontiform shark (Chondrichthyes, Elasmobranchii) from the Upper Triassic Momonoki Formation in Yamaguchi, Japan
A new freshwater lonchidiid hybodontiform shark (Chondrichthyes, Elasmobranchii) from the Upper Triassic Momonoki Formation in Yamaguchi, Japan
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DOI：
10.1080/02724634.2024.2322749
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发表时间：
2024-03-26
影响因子：
1.4
通讯作者：
Sakata，Chisako
中科院分区：
文献类型：
--
作者：
Breeden III，Benjamin T.;Oyama，Nozomu;Sakata，Chisako
我们描述了一个孤立的hybodontiform鲨鱼牙齿的组合从非海相上三叠统（卡尼）Momonoki组的Ominecho在矿山，山口，日本。这些牙齿在1996年首次被报道，并暂时被称为属Hybodus，但它们的分类没有在基于无形态的背景下进行严格的评估，因此它们大多被忽视了。在此，我们分配他们到一个新的种，Parvodus ominechonensis，根据组合的联会形态的lonchididiid genusParvodus和自形特征状态。在日本发现了多种三叠纪的hybodontiforms，但其中的Parvodus ominechonensissp. Parvodus ominechonensis是已知的唯一一个非海相沉积的分类群，也是首次报道的Lonchidididae，它的发现填补了Parchidus在中三叠世（Anisian）和中侏罗世（Bajocian）之间的空白。全球三叠纪记录的Paramussp. Parvodus ominechonensis和Parvodus huizodus来自日本卡尼期。在三叠纪之后，在劳亚大陆和南美洲的海洋和非海洋地层中发现了Parabusis，直到它在早白垩世灭绝。这表明Parabulus可能起源于二叠纪末大规模灭绝后中国南方盘古大陆地区的淡水栖息地，并在今天的东亚地区的整个三叠纪期间多样化，然后在稍后的全球分布中实现全球分布。Mesozoic.http://zoobank.org/urn:lsid:zoobank.org:pub:42B4D1C1-F4BE-4296-896B-01B048BDE25F
We describe an assemblage of isolated hybodontiform shark teeth from the nonmarine Upper Triassic (Carnian) Momonoki Formation in the town of Ominecho in Mine, Yamaguchi, Japan. These teeth were first reported in 1996 and tentatively referred to the genusHybodus, but their taxonomy was not rigorously evaluated in an apomorphy-based context, and they have since been mostly overlooked. Herein, we assign them to a new species,Parvodus ominechonensis, based on a combination of synapomorphies of the lonchidiid genusParvodusand autapomorphic character states. A diversity of Triassic hybodontiforms is known from Japan, but of these,Parvodus ominechonensissp. nov. is the only taxon known from nonmarine deposits and the first reported occurrence of Lonchidiidae.Parvodus ominechonensisfills a gap in the stratigraphic record ofParvodusbetween occurrences in Middle Triassic (Anisian) and Middle Jurassic (Bajocian) strata. The global Triassic record ofParvoduscomprisesParvodus huizodusfrom the Olenekian of China,Parvodussp. from the Anisian of China, andParvodus ominechonensisfrom the Carnian of Japan, of whichParvodus ominechonensisandParvodus huizodusare known from nonmarine deposits. After the Triassic,Parvodusis known from marine and nonmarine strata across Laurasia and in South America until its extinction during the Early Cretaceous. This suggests thatParvodusmay have originated in freshwater habitats in the South China region of Pangea following the end-Permian mass extinction and diversified throughout the Triassic in present day East Asia before attaining a global distribution later in the Mesozoic.http://zoobank.org/urn:lsid:zoobank.org:pub:42B4D1C1-F4BE-4296-896B-01B048BDE25F