Symmorium is an extinct genus of stethacanthid shark that lived during the Carboniferous period. Symmorium bears close similarity in size and appearance to Stethacanthus, but is missing the "spine and brush" on its back. Some paleontologists think that the two forms are simply the males and females of related species, while other scientists think they were different groups.

Various teeth of different species of Symmorium.
Mantell's Iguanodon restoration

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