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首页> 外文期刊>Journal of Systematic Palaeontology >A lungfish survivor of the end-Devonian extinction and an Early Carboniferous dipnoan radiation
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A lungfish survivor of the end-Devonian extinction and an Early Carboniferous dipnoan radiation

机译：陆德郡灭绝的肺鱼幸存者和早期的石炭系德国辐射

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摘要

Until recently the immediate aftermath of the Hangenberg event of the Famennian Stage (Upper Devonian) was considered to have decimated sarcopterygian groups, including lungfish, with only two taxa, Occludus romeri and Sagenodus spp., being unequivocally recorded from rocks of Tournaisian age (Mississippian, Early Carboniferous). Recent discoveries of numerous morphologically diverse lungfish tooth plates from southern Scotland and northern England indicate that at least 10 dipnoan taxa existed during the earliest Carboniferous. Of these taxa, only two, Xylognathus and Ballgadus, preserve cranial and postcranial skeletal elements, which have yet to be described. Here we present a description of the skull of a new genus and species of lungfish, Limanichthys fraseri gen. et sp. nov., which hails from the very earliest Tournaisian in the Ballagan Formation of Burnmouth, southern Scotland. The new specimen represents the earliest definitive Tournaisian lungfish skull material, thus providing an invaluable insight into the response of this group - and, indeed, Sarcopterygii as a whole - immediately following the latest Devonian Hangenberg event. Phylogenetic analysis places Limanichthys fraseri within the Devonian 'phaneropleurid-fleurantiid' grade of lungfish and shows that the Carboniferous lungfish represent forms that have their origins deep in the Middle and Late Devonian as well as those from a unique Carboniferous radiation.
机译：直到最近，亨普伯格舞台（上牧民）的Hangenberg事件的直接之后被认为是被捕杀的康迟鱼类，包括肺鱼，只有两个捕获者，occludus romeri和Sagenodus spp。，从陀螺仪时代的岩石中毫不含糊地记录（Mississippian ，早期的石炭系）。最近从苏格兰南部和英格兰北部的众多形态学多样的肺鱼牙盘发现表明，最早的石炭系中至少存在10个司南群。这些分类群中，只有两个，木糖和球果，留下尚未描述的颅骨和颅骨骨骼元素。在这里，我们展示了肺鱼的新属，Lungishthiss Fraseri Gen的颅骨的描述。等SP。 11月。，它来自最早的塔尔纳斯人在苏格兰堡垒Burnagan的Ballagan形成。新标本代表了最早的最终朝向肺鱼头骨材料，从而提供了对该群体的反应的宝贵洞察力 - 以及遵循最新的德文山贝尔格赛事之后的整体康乃馨。系统发育分析将Limanichthys Fraseri置于陆龙鱼类的肺鱼等级，表明石炭系肺鱼代表其起源于中期牧民的渊源，以及来自独特的石炭纪辐射的形式。

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