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    Paleogene origin of Planktivory In The Batoidea

    Underwood, Charlie J. and Kolmann, M. and Ward, D. (2017) Paleogene origin of Planktivory In The Batoidea. Journal of Vertebrate Paleontology 37 (3), e1293068. ISSN 0272-4634.

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    Abstract

    The planktivorous mobulid rays are a sister group to, and descended from, rhinopterid and myliobatid rays which possess a dentition showing adaptations consistent with a specialized durophageous diet. Within the Paleocene and Eocene there are several taxa which display dentitions apparently transitional between these extreme trophic modality, in particular the genus Burnhamia. The holotype of Burnhamia daviesi was studied through X-ray computed tomography (CT) scanning. Digital renderings of this incomplete but articulated jaw and dentition revealed previously unrecognized characters regarding the jaw cartilages and teeth. In addition, the genus Sulcidens gen. nov. is erected for articulated dentitions from the Paleocene previously assigned to Myliobatis. Phylogenetic analyses confirm Burnhamia as a sister taxon to the mobulids, and the Mobulidae as a sister group to Rhinoptera. Shared dental characters between Burnhamia and Sulcidens likely represent independent origins of planktivory within the rhinopterid – myliobatid clade. The transition from highly-specialized durophagous feeding morphologies to the morphology of planktivores is perplexing, but was facilitated by a pelagic swimming mode in these rays and we propose through subsequent transition from either meiofauna-feeding or pelagic fish-feeding to pelagic planktivory.

    Metadata

    Item Type: Article
    Additional Information: This is an Accepted Manuscript of an article published by Taylor & Francis, available online at the link above.
    School: Birkbeck Schools and Departments > School of Science > Earth and Planetary Sciences
    Research Centre: Earth and Planetary Sciences, Institute of
    Depositing User: Charles Underwood
    Date Deposited: 29 Sep 2017 12:02
    Last Modified: 09 Jun 2018 00:10
    URI: http://eprints.bbk.ac.uk/id/eprint/19839

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    • Paleogene origin of Planktivory In The Batoidea. (deposited 29 Sep 2017 12:02) [Currently Displayed]

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