New paddlefishes (Acipenseriformes, Polyodontidae) from the Late Cretaceous Tanis Site of the Hell Creek Formation in North Dakota, USA

New paddlefishes (Acipenseriformes, Polyodontidae) from the Late Cretaceous Tanis Site of the Hell Creek Formation in North Dakota, USA
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来自美国北达科他州地狱溪组晚白垩世塔尼斯遗址的新白鲟(鲟鱼目,多齿鱼科)

DOI:
10.1017/jpa.2023.19
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发表时间:
2023
影响因子:
1.4
通讯作者:
Ahlberg, Per E.
Ahlberg, Per E.
中科院分区:
地球科学4区
文献类型:
--
作者:
Hilton, Eric J.;During, Melanie A.D.;Grande, Lance;Ahlberg, Per E.

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最近在北达科他州的塔尼斯遗址发现了大量死亡的鱼类,这些鱼类属于晚白垩世地狱溪组的一部分,其中包含许多保存完好的三维骨骼。其中有两个鲟形科的代表,鲟科(鲟鱼)和多齿鱼科(白鲟)。本文描述了两个新的单型多齿亚目属,扩大了我们对多齿亚目多样性的认识。这里描述的第一个新物种是副剑鱼(Parapsephurus willybemisin)。一般的;一般的它与所有其他已知物种的区别在于具有以下特征的组合:后部细长的顶骨,中间窗孔由顶骨和额骨内侧接壤,侧面由皮翼骨,细长和众多的背尾支点,细长的舌骨下颌骨不是沙漏形,以及鳃耙短而间距大。第二个被描述的多齿亚目物种是Pugiopsephurus inundatusn。一般的;一般的它是由一个组合的星状骨是非常不发达或缺乏,并有一个皮腭与内侧扩张,缺乏外翼突诊断。本文描述的两种白鲟增加了多齿鱼科形态和分类的多样性。这些分类群在地狱溪地层中的存在暗示了在其进化历史的这个阶段,多齿类动物具有相当大的多样性。http://zoobank.org/08cbf8c5-59ba-41fa-9265-8cb762cf7b13
The recently discovered mass mortality of fishes from the Tanis Site in the North Dakota portion of the Late Cretaceous Hell Creek Formation contains many well-preserved, three-dimensional skeletons. Among these are representatives of two acipenseriform families, Acipenseridae (sturgeons) and Polyodontidae (paddlefishes). This paper describes two new monotypic polyodontid genera, expanding our knowledge of polyodontid diversity. The first of the new species described here is †Parapsephurus willybemisin. gen. n. sp. It is distinguished from all other known species by having a combination of posteriorly elongate parietals, the middle fenestra longitudinalis bordered medially by the parietal and frontal and laterally by the dermopterotic, slender and numerous dorsal caudal fulcra, an elongate hyomandibula that is not hourglass shaped, and gill rakers that are short and widely spaced. The second polyodontid species described here is †Pugiopsephurus inundatusn. gen. n. sp. It is diagnosed by a combination of having stellate bones that are exceptionally poorly developed or absent and having a dermopalatine with a medial expansion and lacking an ectopterygoid process. The two species of paddlefishes described in this paper add to the morphological and taxonomic diversity of Polyodontidae. The presence of these taxa within the Hell Creek Formation hints at substantial diversity of polyodontids at this stage of their evolutionary history.UUID: http://zoobank.org/08cbf8c5-59ba-41fa-9265-8cb762cf7b13
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