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    The Late Jurassic ray Kimmerobatis etchesi gen. et sp. nov., and the Jurassic radiation of the Batoidea

    Underwood, Charlie J. and Claeson, K.M. (2017) The Late Jurassic ray Kimmerobatis etchesi gen. et sp. nov., and the Jurassic radiation of the Batoidea. Proceedings of the Geologists' Association , ISSN 0016-7878. (In Press)

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    Abstract

    The laminated marine mudstones of the Late Jurassic of Kimmeridge, southern England, yield two exceptionally well-preserved partial skeletons of a previously unrecognised species of early batoid. These are described as a new genus and species, Kimmerobatis etchesi gen. et sp. nov. which has a general “guitarfish” bauplan as in all other batoids known from the Jurassic. This species possesses a combination of primitive characters such as centra present within the majority of the synarcual and antorbital cartilages that fail to reach the pectoral skeleton along with more derived characters, such as the lack of fin spines. Until now, little study has been carried out on the affinities of Jurassic batoids, despite their key role in understanding batoid evolution. Results from parsimony and likelihood phylogenetic reconstruction indicates that the whole-bodied Jurassic batoids Spathobatis, Belemnobatis, and Kimmerobatis gen. nov. form their own clade, Spathobatidae, and do not lend support to a monophyletic “Rhinobatidae”. Among Jurassic batoids, Kimmerobatis gen. nov. is most derived, but with derived characters being independently acquired compared to modern batoids (e.g. presence of a postpelvic process). The inclusion of whole bodied Jurassic fossils have generated a more resolved hypothesis of batoid evolution throughout the Cretaceous and into the Cenozoic.

    Metadata

    Item Type: Article
    Keyword(s) / Subject(s): Kimmeridgian, Phylogeny, Ray, Guitarfish, Evolution
    School: Birkbeck Schools and Departments > School of Science > Earth and Planetary Sciences > UCL/Birkbeck Centre for Planetary Sciences
    Research Centre: Earth and Planetary Sciences, Institute of
    Depositing User: Charles Underwood
    Date Deposited: 29 Sep 2017 12:04
    Last Modified: 27 Jul 2019 15:06
    URI: http://eprints.bbk.ac.uk/id/eprint/19842

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