A Late Devonian actinopterygian suggests high lineage survivorship across the end-Devonian mass extinction
A Late Devonian actinopterygian suggests high lineage survivorship across the end-Devonian mass extinction
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DOI：
10.1038/s41559-022-01919-4
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发表时间：
2022-11-17
影响因子：
16.8
通讯作者：
Friedman，Matt
中科院分区：
文献类型：
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作者：
Giles，Sam;Feilich，Kara;Friedman，Matt
许多关于放光鳍动物（鳐鱼）早期历史的记载都认为泥盆纪末期的大灭绝对它们的进化有重大影响。现有的系统发育学表明，这一事件可能是一个瓶颈，使该群体的早期多样性减少到少数幸存者。这幅图，加上石炭纪分类学和形态多样性的增加，为灭绝后爆炸性辐射的模型做出了贡献。然而，在灭绝前后大约2000万年（Myr）的窗口内，大多数放光翼鸟的情况鲜为人知，这导致了这些模式意义的不确定性。在这里，我们报告了一个保存异常的化石，来自灭绝前7万年前，揭示了意想不到的解剖学特征。Palaeoneiros clackorumgen。et sp. 11 .在泥盆纪后物种的一个分支中筑巢，在一个扩展的系统发育分析中，将石炭纪放光翼动物的多个谱系划分到泥盆纪。这表明在泥盆纪晚期有隐蔽性但广泛的谱系多样化，在石炭纪有更明显的摄食和运动结构多样化。我们修正的模型与其他脊椎动物进化分支在泥盆纪/石炭纪边界附近的更复杂的分化、生存和多样化模式相匹配。它也从根本上重新校准了这一主要辐射历史早期多样化的开始。
Many accounts of the early history of actinopterygians (ray-finned fishes) posit that the end-Devonian mass extinction had a major influence on their evolution. Existing phylogenies suggest this episode could have acted as a bottleneck, paring the early diversity of the group to a handful of survivors. This picture, coupled with increases in taxonomic and morphological diversity in the Carboniferous, contributes to a model of explosive post-extinction radiation. However, most actinopterygians from within a roughly 20-million year (Myr) window surrounding the extinction are poorly known, contributing to uncertainty about the meaning of these patterns. Here, we report an exceptionally preserved fossil from 7 Myr before the extinction that reveals unexpected anatomical features.Palaeoneiros clackorumgen. et sp. nov. nests within a clade of post-Devonian species and, in an expanded phylogenetic analysis, draws multiple lineages of Carboniferous actinopterygians into the Devonian. This suggests cryptic but extensive lineage diversification in the latest Devonian, followed by more conspicuous feeding and locomotor structure diversification in the Carboniferous. Our revised model matches more complex patterns of divergence, survival and diversification around the Devonian/Carboniferous boundary in other vertebrate clades. It also fundamentally recalibrates the onset of diversification early in the history of this major radiation.