Waggoner, Ben M. «Georges Cuvier (1769–1832)». UCMP Berkeley. Consultado el 8 de marzo de 2018. «Cuvier's insistence on the functional integration of organisms led him to classify animals into four "branches," or embranchements: Vertebrata, Articulata (arthropods and segmented worms), Mollusca (which at the time meant all other soft, bilaterally symmetrical invertebrates), and Radiata (cnidarians and echinoderms).»
