Definitions

from The Century Dictionary and Cyclopedia

  • n. A genus of fossil ganoid fishes of the family Somionotidæ, characterized by thick, deeply imbricating scales with more or less produced overlapping edges, and numerous hemispherical successional teeth which make a revolution of 180° in passing from the incipi-ent to the mature condition. The genus ranges from the Keuper to the Lower Cretaceous, and is widespread in Europe, India, Siberia, and Brazil.

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