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In animals that have lost the parietal eye, including mammals, the pineal sac is retained and condensed into the form of the pineal gland.
en.wikipedia.org Among fish, lampreys retain two functional third eyes, one developed from the parietal gland, and the other from the pineal gland.
en.wikipedia.org The pineal gland was originally believed to be a vestigial remnant of a larger organ.
en.wikipedia.org The principal cell type of the pineal is the pinealocyte sensu stricto.
en.wikipedia.org The depression of erythrosuchids is a remnant of the pineal foramen that was present in more primitive reptiles.
en.wikipedia.org