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    Molecular clocks indicate turnover and diversification of modern coleoid cephalopods during the mesozoic marine revolution

    Access Status
    Open access via publisher
    Authors
    Tanner, A.
    Fuchs, D.
    Winkelmann, I.
    Gilbert, Thomas
    Pankey, M.
    Ribeiro, A.
    Kocot, K.
    Halanych, K.
    Oakley, T.
    Da Fonseca, R.
    Pisani, D.
    Vinther, J.
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Tanner, A. and Fuchs, D. and Winkelmann, I. and Gilbert, T. and Pankey, M. and Ribeiro, A. and Kocot, K. et al. 2017. Molecular clocks indicate turnover and diversification of modern coleoid cephalopods during the mesozoic marine revolution. Proceedings of the Royal Society B: Biological Sciences. 284: 20162818.
    Source Title
    Proceedings of the Royal Society B: Biological Sciences
    DOI
    10.1098/rspb.2016.2818
    ISSN
    0962-8452
    School
    Department of Environment and Agriculture
    URI
    http://hdl.handle.net/20.500.11937/51484
    Collection
    • Curtin Research Publications
    Abstract

    Coleoid cephalopod molluscs comprise squid, cuttlefish and octopuses, and represent nearly the entire diversity of modern cephalopods. Sophisticated adaptations such as the use of colour for camouflage and communication, jet propulsion and the ink sac highlight the unique nature of the group. Despite these striking adaptations, there are clear parallels in ecology between coleoids and bony fishes. The coleoid fossil record is limited, however, hindering confident analysis of the tempo and pattern of their evolution. Here we use a molecular dataset (180 genes, approx. 36 000 amino acids) of 26 cephalopod species to explore the phylogeny and timing of cephalopod evolution. We show that crown cephalopods diverged in the Silurian–Devonian, while crown coleoids had origins in the latest Palaeozoic.While the deep-sea vampire squid and dumbo octopuses have ancient origins extending to the Early Mesozoic Era, 242+38 Ma, incirrate octopuses and the decabrachian coleoids (10-armed squid) diversified in the Jurassic Period. These divergence estimates highlight the modern diversity of coleoid cephalopods emerging in the Mesozoic Marine Revolution, a period that also witnessed the radiation of most ray-finned fish groups in addition to several other marine vertebrates. This suggests that that the origin of modern cephalopod biodiversity was contingent on ecological competition with marine vertebrates.

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