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首页> 外文期刊>Cretaceous Research >A new pachyrhizodontid fish (Actinopterygii: Teleostei) from the Tarrant Formation (Cenomanian) of the Upper Cretaceous Eagle Ford Group in Texas, USA
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A new pachyrhizodontid fish (Actinopterygii: Teleostei) from the Tarrant Formation (Cenomanian) of the Upper Cretaceous Eagle Ford Group in Texas, USA

机译：来自美国德克萨斯州德克萨斯州德克萨斯州上白垩纪形成（Cenomanian）的新的Pachyrhizodontid鱼（Actinopterygii：Teactostei）

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摘要

SMU 76938 is a nearly complete skeleton of a fossil bony fish, about 1.2 m in total length, housed in Southern Methodist University in Dallas, Texas, USA. It was collected from the Tarrant Formation (middle Cenomanian) of the Upper Cretaceous Eagle Ford Group in Tarrant County, Texas, an area where it was near the East Texas Embayment of the Western Interior Seaway during the Late Cretaceous. Our phylogenetic analysis indicates that it is a pachyrhizodontid crossognathiform fish, and comparisons with previously reported pachyrhizodontids suggest that the fossil fish belongs to a new genus and species within Pachyrhizodontidae, Polcynichthys lloydhilli gen. et sp. nov.. With a fusiform body, a large symmetrical caudal fin, and a mouth with numerous small conical teeth suited for grasping, the new taxon is interpreted to be a fast swimming, open-ocean predator that likely pursued smaller squid, crustaceans, and other fishes. Vertebral growth rings suggest that the individual was possibly about 14 years old at the time of its death, and our vertebra-based theoretical growth model indicates that the species could have reached up to about 1.8 m TL and lived up to 37 years old in age. (C) 2020 Elsevier Ltd. All rights reserved.
机译：SMU 76938是化石骨鱼的几乎完全骨骼，总长度为1.2米，位于美国达拉斯达拉斯的南部卫理公会大学。它是从德克萨斯州塔尔坦斯县塔兰特县上白垩纪鹰福特集团的坦克队（中年尖叫）的坦率地层（中年）收集，这是在白垩纪后期德克萨斯州西部内部海道的东部德克萨斯州的地区附近。我们的系统发育分析表明它是一种pachyrhizodontid的Crossognathiform鱼，与先前报道的Pachyrhizodontids的比较表明，化石鱼属于Pachyrhizodontidae，Polcynichthys Lloydhilli Gen的新属和物种。等等。 11月。含有梭形的身体，一个大型对称的尾鳍，和一个适合抓住的众多小锥形牙齿的嘴，新的分类群被解释为一个快速的游泳，开放的海洋捕食者，可能追求较小的鱿鱼，甲壳类动物和其他鱼类。椎体生长戒指表明，在死亡时，个人可能大约14岁，基于椎体的理论增长模型表明该物种可以达到大约1.8米的TL，并且在年龄最多37岁。 。 （c）2020 elestvier有限公司保留所有权利。

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