Some animals metamorphosize.
In his 1817 Le Rgne Animal, Georges Cuvier used comparative anatomy to group the animals into four embranchements ("branches" with different body plans, roughly corresponding to phyla), namely vertebrates, molluscs, articulated animals (arthropods and annelids), and zoophytes (radiata) (echinoderms, cnidaria and other forms)
 In most other groups, the blastula  undergoes more complicated rearrangement

