Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Hanyar wucewa: Yawancin dabbobi masu kashin baya suna da glandon pineal. Yana yiwuwa cewa kakannin kowa na dukkan vertebrates yana da nau'i na kwayoyin photosensory a saman kansa, kama da tsari a cikin lampreys na zamani. Wasu kifayen Devonian da suka ɓace suna da ƙuƙwalwar ƙuƙwalwa guda biyu a cikin kwanyarsu, suna ba da shawara game da bilaterality na kakanninmu na idanu. Idon parietal da glandon pineal na tetrapods masu rai sune zuriyar sassan hagu da dama na wannan sashin, bi da bi.A lokacin ci gaban amfrayo, idon parietal da sashin pineal na lizards na zamani da tuataras suna haɗuwa tare daga aljihun da aka kafa a cikin ectoderm na kwakwalwa. Rashin idanun parietal a cikin tetrapods masu rai da yawa yana tallafawa ta hanyar haɓaka ci gaban tsarin da aka haɗu wanda daga baya ya haɗu zuwa cikin ƙwayar pineal guda ɗaya a cikin ci gaban ƙwayoyin tururuwa, macizai, tsuntsaye, da dabbobi masu shayarwa. Kwayoyin pineal na dabbobi masu shayarwa sun faɗi cikin ɗayan rukuni uku dangane da siffar. Tsuntsaye suna da glandon pineal mai rikitarwa fiye da sauran dabbobi masu shayarwa.Crocodilians da wasu jinsunan dabbobi masu shayarwa (wasu xenarthrans (sloths), pangolins, sirenians (manatees & dugongs), da wasu marsupials (sugar gliders) sun rasa duka idanunsu na parietal da sashin jikinsu na pineal. Polar mammals, kamar walruses da wasu hatimai, suna da manyan glandan pineal. Dukkanin amphibians suna da sashin pineal, amma wasu kwari da toads suma suna da abin da ake kira "gabobin gaba", wanda shine ainihin idon ido. Pinealocytes a cikin da yawa wadanda ba dabbobi masu shayarwa ba suna da kamanceceniya da ƙwayoyin photoreceptor na ido. Shaida daga ilimin halittar jiki da ilimin halittu na ci gaba ya nuna cewa kwayoyin pineal suna da kakannin juyin halitta na yau da kullun tare da kwayoyin retinal. Tsarin cytostructure na pineal kamar yana da kamanceceniya na juyin halitta ga kwayoyin retinal na idanun gefe. Tsuntsaye na zamani da dabbobi masu rarrafe suna bayyana melanopsin mai ɗaukar hoto a cikin glandon pineal. Ana tunanin glandan pineal na tsuntsaye suna aiki kamar kwayar halitta a cikin dabbobi masu shayarwa. Tsarin idon pineal a cikin lizards na zamani da tuatara...  Tambaya: Daga ina ne ake aikawa da tsarin tafiyar rana a cikin mutane da sauran dabbobi masu shayarwa?
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