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Are any invertebrate nephridia (proto/meta) homologous with vertebrate kidneys in the sense that embryologically they also begin together with the genital system? When did the embryologic association between reproduction and osmoregulartion/metabolite elimination begin in terms of evolution?

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I dont think invertebrates have urogenital system. –  WYSIWYG Jul 3 at 9:33
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So which one, excretory or reproductive, is homologous to the vertebrate urogenital system... I understand that invertebrate is a polyphyletic category of exclusion, but I'm talking about the closest related animal phyla to vertebrate... I guess I should'look deeper into lancets and hagfish... –  Jasand Pruski Jul 4 at 10:35
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