Wasu sun mutu Devonian kifi da biyu parietal foramina a cikin kwanyarsu, bayar da shawarar wani ancestral bilaterality na parietal idanu. The parietal ido da kuma pineal gland na rayuwa tetrapods ne mai yiwuwa zuriyar hagu da dama sassa na wannan sashin jiki, bi da bi. A lokacin embryonic ci gaba, da parietal ido da kuma pineal sashin jiki na zamani lizards da kuma tuataras samar da tare daga wani aljihu kafa a cikin kwakwalwa eodophilus.
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