Functional Morphology of the Invertebrate Skeleton, Enrico Savazzi, 1999, John Wiley & Sons, New York, 712 p. (Hardcover $275.00) ISBN: 0-047-197776-4.

To paleontologists, Seilacher's triangle represents one of the most widely recognizable images, probably surpassed only by Sepkoski's “three faunas.” Seilacher stressed that form can best be understood in an evolutionary context by considering historical, fabricational (morphogenetic), and functional factors. The triangle was a conceptual device and not a methodological guide; although it emphasized all three factors, it did not preclude analyzing each independently. Therefore, studies of functional morphology could be defined as those concerned only with the functional corner....

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