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首页> 外文期刊>Neues Jahrbuch fur Geologie und Palaontologie. Abhandlungen >First record of the lytoceratid Protetragonites HYATT, 1900 (Cephalopoda: Ammonoidea) from the Upper Jurassic of southwestern Germany
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First record of the lytoceratid Protetragonites HYATT, 1900 (Cephalopoda: Ammonoidea) from the Upper Jurassic of southwestern Germany

机译：最早来自德国西南部上侏罗统的1900年裂谷类前四方体HYATT（头足纲动物：Ammonoidea）的首次记录

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摘要

Lytoceratid ammonites are extremely rare in the Upper Jurassic of southwestern Germany and only two records have been published so far, both referred to the genus Lytoceras SUESS, 1865. Here we describe a third specimen from the uppermost Impressamergel Formation (Bimammatum Zone, Late Oxfordian) of Deilingen (Baden-Wurttemberg). The whorl section, ornamentation and suture line indicate that it represents the first record of the genus Protetragonites HYATT, 1900 from southwestern Germany and one of the stratigraphically oldest records of the genus. As it cannot be referred to any known species of the genus, a new species, Protetragonites zuegeli, is erected, which is characterised by its large size, slightly compressed whorls that are only in minimal contact, a rather subevolute coiling and the presence of more than ten equally spaced, straight constrictions on the phragmocone.
机译：莱杜鹃亚mon石在德国西南部的上侏罗统中极为罕见，迄今仅发表了两份记录，均涉及Lytoceras SUESS属，1865年。在这里，我们描述了最上层的Impressamergel组（Bimammatum区，牛津晚期）的第三个标本。 Deilingen（巴登-符腾堡州）的博物馆。螺纹剖面，装饰和缝合线表明，它代表了来自德国西南部的1900年普利方根岩HYATT属的第一个记录，也是该地层中最古老的记录之一。由于它不能被称为该属的任何已知物种，因此竖立了一个新物种，Protetragonites zuegeli，其特征是其大尺寸，轻微压缩的轮生仅以最小的接触，相当小的渐渐卷曲和更多的存在在ten骨圆锥上没有十个等距的直缩。

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