vertition

vertition
n. [L. vertere, to turn]
An idionymous organ observed unilaterally among specimens of the same species and stage that has evolutionary significance.

Online Dictionary of Invertebrate Zoology. . 2005.

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Look at other dictionaries:

  • aleatory — adj. [L. alea, chance] Pertaining to organs that are existing or lacking, depending on chance; see vertition …   Dictionary of invertebrate zoology

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