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Isurus retroflexus

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Isurus_retroflexus.jpg Hexanchus sp. (cow shark) lower toothThumbnailsCretascymnus sp.Hexanchus sp. (cow shark) lower toothThumbnailsCretascymnus sp.Hexanchus sp. (cow shark) lower toothThumbnailsCretascymnus sp.Hexanchus sp. (cow shark) lower toothThumbnailsCretascymnus sp.Hexanchus sp. (cow shark) lower toothThumbnailsCretascymnus sp.Hexanchus sp. (cow shark) lower toothThumbnailsCretascymnus sp.Hexanchus sp. (cow shark) lower toothThumbnailsCretascymnus sp.

Extinct mako shark species, lower lateral tooth.
Location: Massif du Jura, Ain (01), France
Upper Marine Molasse (OMM), Miocene, Burdigalian
17-20 million years old