A new time-scale for ray-finned fish evolution
A new time-scale for ray-finned fish evolution
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DOI：
10.1098/rspb.2006.3749
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发表时间：
2007-02-22
影响因子：
4.7
通讯作者：
Coates, Michael I.
中科院分区：
文献类型：
--
作者：
Hurley, Imogen A.;Mueller, Rachel Lockridge;Coates, Michael I.
放线鳍鱼是脊椎动物中最大、最多样化的类群，但关于其早期进化的时间却鲜有人达成一致意见。使用线粒体基因组数据进行的估计表明，主要的放线蕨类分支比化石所暗示的分歧日期要古老得多。在这里，使用形态、核和线粒体遗传数据重新研究了这些分支进化起源的时间。结果表明，现有的基于化石的新翅目冠类群的年龄估计，包括硬骨鱼，Lesssteus(GAR)和Amia(弓鳍)，至少还太年轻40 Myr。我们提出了新的古生物学证据，证明新翅目冠辐射是一个古生代事件，并证明了新翼手纪年龄的分子和形态数据之间的冲突部分是由于遗失的化石数据。尽管我们的分子数据也为硬骨骨冠提供了一个更早的年龄估计，但这种范围的扩展仍然没有化石证据支持。来自所有相关分支的核数据被用来证明放线蕨类全基因组复制事件是硬骨鱼特有的。虽然对这一事件的日期估计与硬骨干群的可能范围重叠，但基因组复制和放线蕨类系统发育的大规模模式之间的关联仍然难以捉摸。
The Actinopterygii (ray-finned fishes) is the largest and most diverse vertebrate group, but little is agreed about the timing of its early evolution. Estimates using mitochondrial genomic data suggest that the major actinopterygian clades are much older than divergence dates implied by fossils. Here, the timing of the evolutionary origins of these clades is reinvestigated using morphological, and nuclear and mitochondrial genetic data. Results indicate that existing fossil-based estimates of the age of the crown-group Neopterygii, including the teleosts, Lepisosteus (gar) and Amia (bowfin), are at least 40 Myr too young. We present new palaeontological evidence that the neopterygian crown radiation is a Palaeozoic event, and demonstrate that conflicts between molecular and morphological data for the age of the Neopterygii result, in part, from missing fossil data. Although our molecular data also provide an older age estimate for the teleost crown, this range extension remains unsupported by the fossil evidence. Nuclear data from all relevant clades are used to demonstrate that the actinopterygian whole-genome duplication event is teleost-specific. While the date estimate of this event overlaps the probable range of the teleost stem group, a correlation between the genome duplication and the large-scale pattern of actinopterygian phylogeny remains elusive.