trachyacanthid love


from The Century Dictionary and Cyclopedia

  • n. A hypothetical stage, in the phytogeny of the fishes, in which the dentition was plate-like and permanent and the dermal armor was gradually becoming reduced in transition from the plated Paleozoic fishes to the shagreencoated sharks. Trachyacan thids have also been supposed to occupy a position intermediate between sharks and chimæroids.


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