Upper Jurassic Period

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Ctenochasma roemeri

 

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Ctenochasma (comb jaw) roemeri (after Roemer)
Lower jaw from the upper Jurassic marine limestone of Hannover, Lower Saxony, Germany.

von Meyer, C. E. H. 1851, Ctenochasma Roemeri. Paläontographica 2, 82–84 & pl. 13.