Dorsal vertebra of platecarpus, a cretaceous. Mosasaur from the Niobrara Chalk of Kansas etc.

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    Licence: Attribution 4.0 International (CC BY 4.0)

    Credit: Dorsal vertebra of platecarpus, a cretaceous. Mosasaur from the Niobrara Chalk of Kansas etc. Wellcome Collection. Source: Wellcome Collection.

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