a short, vertical ridge on the inner and/or outer tooth crown base in Chondrichthyes

Dictionary of ichthyology. 2009.

Look at other dictionaries:

  • costule — (ko stu l ) s. f. Terme de zoologie. Petite côte.    Stries qui se voient à la surface de certaines coquilles. ÉTYMOLOGIE    Diminutif de costa, côte …   Dictionnaire de la Langue Française d'Émile Littré

  • costule — cos·tule …   English syllables

  • costule — noun see costula …   Useful english dictionary

  • Frond — A frond is a large leaf with many divisions to it, and the term is typically used for the leaves of palms, ferns or cycads. [ [http://www.m] Merriam Webster s Online Dictionary ] A frond is the leaf like structure of a fern …   Wikipedia

  • Dryopteris macropholis — Scientific classification Kingdom: Plantae …   Wikipedia

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