| parapineal |
pertaining to the parapineal organ of certain lower vertebrates.
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| parapineal o. |
a median dorsal outgrowth of the pineal body in certain lower vertebrates such as tailless amphibians, primitive fishes, and lizards; its principal cell type is an apparent photoreceptor. In some species it may specialize to form an extracranial epiphyseal eye. Called also parietal o.
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