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首页> 外文期刊>Journal of Paleontology >A new actinopterygian from the Famennian of East Greenland and the interrelationships of Devonian ray-finned fishes
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A new actinopterygian from the Famennian of East Greenland and the interrelationships of Devonian ray-finned fishes

机译：东格陵兰岛法门尼人的一种新的放线翅目和泥盆纪射线鳍鱼类的相互关系

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摘要

A new actinopterygian, Cuneognathus gardineri new genus and species, is described from the Devonian (Famennian) Obrutschew Bjerg Formation of East Greenland on the basis of multiple incomplete specimens. Cuneognathus most closely resembles Limnomis from the Famennian Catskill Formation of Pennsylvania, and, like that taxon, is known exclusively from freshwater deposits. A cladistic analysis with an ingroup of 13 actinopterygians and an outgroup of five sarcopterygians explores the relationships between the new genus and some of its better-known Devonian contemporaries, and recovers the same four topologies regardless of the implementation of limited character ordering. Cheirolepis is resolved as the most basal of well-known Devonian actinopterygians, consistent with a majority of previous studies. A novel sister-group relationship between Howqualepis and Tegeolepis is found in all trees. Disagreement between the most parsimonious cladograms is concentrated in a clade whose members are often informally referred to as 'stegotrachelids.' Cuneognathus and Limnomis are resolved as sister taxa within this large radiation along with the pairings of Moythomasia dugaringa plus M. nitida and Krasnoyarichtkys plus Stegotrachelus. The arrangement of taxa is conserved when the enigmatic Dialipina is added to the analysis, although the reconstructed position of that genus above both Cheirolepis and Osorioichthys seems improbable. Our scheme of relationships suggests that actinopterygians invaded freshwater environments at least four times during the Devonian, while age constraints indicate that many of the cladogenic events between ingroup taxa included in this study occurred during or before the Givetian.
机译：在多个不完整标本的基础上，从东格陵兰的泥盆纪（Famennian）Obrutschew Bjerg组描述了一种新的放线翅目，Cuneognathus gardineri的新属和新种。 Cuneognathus最类似于宾夕法尼亚州Famennian Catskill组的Limnomis，并且像那个分类群一样，仅以淡水沉积物为人所知。一个分类分析，包括一组13个放线翅目昆虫和一组5个sa翅目昆虫，探索了该新属及其某些较著名的泥盆纪当代人之间的关系，并且不管实施有限的字符顺序，都恢复了相同的四种拓扑。与大多数先前的研究一致，Cheirolepis被认为是著名的泥盆纪放线翅目的最基础。在所有树木中都发现了Howqualepis和Tegeolepis之间新颖的姐妹群关系。最简约的枝状图之间的分歧主要集中在一个枝丛中，其成员通常被非正式地称为“剑背龙”。 Cuneognathus和Limnomis与Moythomasia dugaringa加上M. nitida和Krasnoyarichtkys加上Stegotrachelus配对，在这个大辐射范围内被解析为姊妹类群。当将神秘的Dialipina添加到分析中时，分类单元的排列得以保留，尽管该类在Cheirolepis和Osorioichthys上方的重构位置似乎是不可能的。我们的关系计划表明，放线翅目昆虫在泥盆纪期间至少侵害了淡水环境四次，而年龄限制表明，这项研究中包括的群内类群之间的许多致成因事件发生在吉文天期间或之前。

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