Modularity and heterochrony in the evolution of the ceratopsian dinosaur frill

Modularity and heterochrony in the evolution of the ceratopsian dinosaur frill
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角龙恐龙褶边进化中的模块化和异时性

DOI:
10.1002/ece3.6361
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发表时间:
2020
影响因子:
2.6
通讯作者:
Makovicky, Peter J.
Makovicky, Peter J.
中科院分区:
生物学2区
文献类型:
--
作者:
Prieto‐Márquez, Albert;Garcia‐Porta, Joan;Joshi, Shantanu H.;Norell, Mark A.;Makovicky, Peter J.

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化石记录提供了在宏观进化尺度上异时性的令人信服的例子,比如爱尔兰麋鹿的变形巨角。在角龙类恐龙(如三角龙)独特的颅骨皱褶的进化过程中,也发现了异时性。虽然角龙类的褶边在大小、形状和排列上各不相同,但缺乏定量分析来检验异时性假说。在这里,我们使用几何形态测量学研究褶边形状变化角龙的多样性和四个物种保存的增长系列。然后,我们测试是否褶边构成一个可进化的模块,跨物种和物种内,并比较生长轨迹的类群与个体发育的增长系列,以确定异时过程。的ceratopsis褶边的演变主要包括逐步扩大其尾部和caudolateral边缘,形态空间占领以下分类组。虽然埋藏变形是一个复杂的因素,我们的数据支持跨物种和物种内的模块化。Peramorphosis在褶边进化中发挥了重要作用,在新角龙类进化的早期加速,随后在后来的角龙类角龙类分化中进行了生殖。peramorphic演化的角孔类褶边可能已经促进了脱钩的这种结构从颌骨肌肉组织,一个推断,预测扩大morphospace占领和较高的进化速率之间的角孔类确实证明了我们的数据。然而,需要对早期分歧分类群的微薄记录进行更密集的采样,以进一步测试这一点。
The fossil record provides compelling examples of heterochrony at macroevolutionary scales such as the peramorphic giant antlers of the Irish elk. Heterochrony has also been invoked in the evolution of the distinctive cranial frill of ceratopsian dinosaurs such asTriceratops. Although ceratopsian frills vary in size, shape, and ornamentation, quantitative analyses that would allow for testing hypotheses of heterochrony are lacking. Here, we use geometric morphometrics to examine frill shape variation across ceratopsian diversity and within four species preserving growth series. We then test whether the frill constitutes an evolvable module both across and within species, and compare growth trajectories of taxa with ontogenetic growth series to identify heterochronic processes. Evolution of the ceratopsian frill consisted primarily of progressive expansion of its caudal and caudolateral margins, with morphospace occupation following taxonomic groups. Although taphonomic distortion represents a complicating factor, our data support modularity both across and within species. Peramorphosis played an important role in frill evolution, with acceleration operating early in neoceratopsian evolution followed by progenesis in later diverging cornosaurian ceratopsians. Peramorphic evolution of the ceratopsian frill may have been facilitated by the decoupling of this structure from the jaw musculature, an inference that predicts an expansion of morphospace occupation and higher evolutionary rates among ceratopsids as indeed borne out by our data. However, denser sampling of the meager record of early‐diverging taxa is required to test this further.
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影响因子: 2
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