Parietal eye

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The parietal eye of a juvenile bullfrog

A parietal eye, also known as a third eye or pineal eye, is an eye located at the top of the head. Reptiles, amphibians have this eye. The third eye is always smaller than the main paired eyes.[1] In living species, it is always covered by skin and is not visible externally. [1]

References[change | change source]

  1. 1.0 1.1 Romer, Alfred Sherwood; Parsons, Thomas S. (1977). The Vertebrate Body. Philadelphia, PA: Holt-Saunders International. pp. 471–473