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Early high rates and disparity in the evolution of ichthyosaurs.
Commun Biol. 2020 02 13; 3(1):68.CB

Abstract

How clades diversify early in their history is integral to understanding the origins of biodiversity and ecosystem recovery following mass extinctions. Moreover, diversification can represent evolutionary opportunities and pressures following ecosystem changes. Ichthyosaurs, Mesozoic marine reptiles, appeared after the end-Permian mass extinction and provide opportunities to assess clade diversification in a changed world. Using recent cladistic data, skull length data, and the most complete phylogenetic trees to date for the group, we present a combined disparity, morphospace, and evolutionary rates analysis that reveals the tempo and mode of ichthyosaur morphological evolution through 160 million years. Ichthyosaur evolution shows an archetypal early burst trend, driven by ecological opportunity in Triassic seas, and an evolutionary bottleneck leading to a long-term reduction in evolutionary rates and disparity. This is represented consistently across all analytical methods by a Triassic peak in ichthyosaur disparity and evolutionary rates, and morphospace separation between Triassic and post-Triassic taxa.

Authors+Show Affiliations

Palaeobiology Research Group, University of Bristol, Life Sciences Building, 24 Tyndall Avenue, Bristol, BS8 1TQ, UK. benjamin.moon@bristol.ac.uk.Palaeobiology Research Group, University of Bristol, Life Sciences Building, 24 Tyndall Avenue, Bristol, BS8 1TQ, UK.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

32054967

Citation

Moon, Benjamin C., and Thomas L. Stubbs. "Early High Rates and Disparity in the Evolution of Ichthyosaurs." Communications Biology, vol. 3, no. 1, 2020, p. 68.
Moon BC, Stubbs TL. Early high rates and disparity in the evolution of ichthyosaurs. Commun Biol. 2020;3(1):68.
Moon, B. C., & Stubbs, T. L. (2020). Early high rates and disparity in the evolution of ichthyosaurs. Communications Biology, 3(1), 68. https://doi.org/10.1038/s42003-020-0779-6
Moon BC, Stubbs TL. Early High Rates and Disparity in the Evolution of Ichthyosaurs. Commun Biol. 2020 02 13;3(1):68. PubMed PMID: 32054967.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Early high rates and disparity in the evolution of ichthyosaurs. AU - Moon,Benjamin C, AU - Stubbs,Thomas L, Y1 - 2020/02/13/ PY - 2019/10/11/received PY - 2020/01/07/accepted PY - 2020/2/15/entrez PY - 2020/2/15/pubmed PY - 2021/5/11/medline SP - 68 EP - 68 JF - Communications biology JO - Commun Biol VL - 3 IS - 1 N2 - How clades diversify early in their history is integral to understanding the origins of biodiversity and ecosystem recovery following mass extinctions. Moreover, diversification can represent evolutionary opportunities and pressures following ecosystem changes. Ichthyosaurs, Mesozoic marine reptiles, appeared after the end-Permian mass extinction and provide opportunities to assess clade diversification in a changed world. Using recent cladistic data, skull length data, and the most complete phylogenetic trees to date for the group, we present a combined disparity, morphospace, and evolutionary rates analysis that reveals the tempo and mode of ichthyosaur morphological evolution through 160 million years. Ichthyosaur evolution shows an archetypal early burst trend, driven by ecological opportunity in Triassic seas, and an evolutionary bottleneck leading to a long-term reduction in evolutionary rates and disparity. This is represented consistently across all analytical methods by a Triassic peak in ichthyosaur disparity and evolutionary rates, and morphospace separation between Triassic and post-Triassic taxa. SN - 2399-3642 UR - https://www.unboundmedicine.com/medline/citation/32054967/Early_high_rates_and_disparity_in_the_evolution_of_ichthyosaurs_ L2 - https://doi.org/10.1038/s42003-020-0779-6 DB - PRIME DP - Unbound Medicine ER -