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Morphology of Isistius brasiliensis. a Lateral view of a specimen from London Natural History Museum. b, c Jaws close-up showing sucker-like lips, hook-like upper teeth, and razor-sharp lower teeth, London Natural History Museum. Image credit: Patrick Campbell, 2015. d Reconstructed bite mark in plasticine from an Isistius brasiliensis specimen, Paris Natural History Museum. The arrow indicates the incision produced by the lower teeth of the specimen
