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Noun
Definition: Any ammonite (Ammonoidea) of the Jurassic period, descended from Psiloceras, the sole surviving ammonite genus of the Triassic–Jurassic extinction event.
VariousWords beta
Definition: Any ammonite (Ammonoidea) of the Jurassic period, descended from Psiloceras, the sole surviving ammonite genus of the Triassic–Jurassic extinction event.