Giant Mesozoic coelacanths (Osteichthyes, Actinistia) reveal high body size disparity decoupled from taxic diversity.
Giant Mesozoic coelacanths (Osteichthyes, Actinistia) reveal high body size disparity decoupled from taxic diversity.
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DOI：
10.1038/s41598-021-90962-5
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发表时间：
2021-06-03
影响因子：
4.6
通讯作者：
Guinot G
中科院分区：
文献类型：
--
作者：
Cavin L;Piuz A;Ferrante C;Guinot G
物种形成率与以体型大小表示的形态进化之间的正相关关系是脊椎动物的一个宏观进化特征。虽然腔棘鱼的类群多样性和形态进化缓慢，但它们的化石记录表明，大型和小型物种共存，这使人们对形态和身体大小差异之间的联系提出了质疑。在这里，我们描述和重新评估巨型腔棘鱼化石。有两个属的鱼长达5米，使它们成为有史以来十大硬骨鱼之一。腔棘鱼的身体大小调整的类群多样性的差距是更大的比射线鳍鱼。以前的研究表明，在这一组的物种形成率和形态进化率总体较低，我们的研究结果表明，这些参数是脱钩的差距，在腔棘鱼的身体大小。现存的Latimeria的基因组和生理特征可能反映了灭绝的亲戚如何长到如此大的尺寸。这些特征突出了这些“活化石”特有的新的进化特征。
The positive correlation between speciation rates and morphological evolution expressed by body size is a macroevolutionary trait of vertebrates. Although taxic diversification and morphological evolution are slow in coelacanths, their fossil record indicates that large and small species coexisted, which calls into question the link between morphological and body size disparities. Here, we describe and reassess fossils of giant coelacanths. Two genera reached up to 5 m long, placing them among the ten largest bony fish that ever lived. The disparity in body size adjusted to taxic diversity is much greater in coelacanths than in ray-finned fishes. Previous studies have shown that rates of speciation and rates of morphological evolution are overall low in this group, and our results indicate that these parameters are decoupled from the disparity in body size in coelacanths. Genomic and physiological characteristics of the extant Latimeria may reflect how the extinct relatives grew to such a large size. These characteristics highlight new evolutionary traits specific to these “living fossils”.
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