protoconch


protoconch
n. [Gr. protos, first; konche, shell]
(MOLLUSCA: Gastropoda)
The embryonic shell of a univalve, indicated by the apical whorls of the adult shell being clearly demarcated from later ones; see prodissoconch.

Online Dictionary of Invertebrate Zoology. . 2005.

Look at other dictionaries:

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  • Protoconch — A protoconch (meaning first or earliest or original shell) is an embryonic or larval shell of some classes of molluscs, e.g., the initial chamber of an ammonite or the larval shell of a gastropod. The protoconch may sometimes consist of several… …   Wikipedia

  • protoconch — pro·to·conch …   English syllables

  • protoconch — …   Useful english dictionary

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