Lewy (2002),addressed a variety of the muscular-attachment hypothesis for the function of the ammonite septal suture, namely, that of fastening the body to the shell during active prey subjugation. In this way, sutural complexity is an index of how active the ammonite was as a carnivore. He followed Henderson (1984, p. 461) in that complex septa “facilitated the attachment of adductor muscles” (Lewy, 2002, p. 64). Without adding new data, Lewy (2002) discredited not only other functional hypotheses, but also those of fabricational nature, in particular the tie-point model (Seilacher, 1973, 1975...

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