Despite these caveats, we can only conclude that the first fruits of evo-devo have revealed some remarkable, and extensive, homolgy in both genetic structure and action among animal phyla (particularly between arthropods and chordates, the former prototypes of separation in our traditions and literature), and that these data have confirmed some important aspects of the most ridiculed formalist theory of constraint in the history of morphological and evolutionary thought: Geoffroy’s claim for homology between vertebrate and arthropod segments, with the idealized segment itself regarded as the
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