German zoologist and early Darwinian. By clarifying the embryological distinction between deviation and terminal addition, and their respective relationships to selection and Lamarckism, he established the "recapitulation hypothesis" that phylogeny could be determined by examining ontogeny. Posited phylogeny of the Crustacea, believing the Nauplius and Zoea stages to represent ancestral adults. Discovered mimicry in butterflies (along with Bates).
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