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Embryogenesis follows different stages across the animal phyla, monoblasts, diploblasts, triploblasts, chordates, and I have a hard time wrapping my head around exactly where they all relate in terms of phylotypical stages. Gastrulation is a term assigned to mean "formation of the stomach", archenteron, but ceases to form a gut or gut-tube at some point, instead forming the notochord (via the primitive streak as an intermediary. ) Is the primitive streak as an invagination along the surface of the embryonic plate homologous with the archenteron? (Is it an archenteron more or less, just one that never finishes, much like other vestigial organs like the thyroglossal duct in humans?)

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