The functional morphology of septal sutures and modified body-chambers of ammonoids and their inferred life habits have been popular topics for over a hundred years. Such long history includes the repetition of ideas, some rejected long ago, that originated in the last half of the 19th century mainly in Germany and Austria. Recent examples of such recurrences are the papers by Lewy (1996, 2000, 2002). His nude-ammonites-became-octopods thesis goes back to Suess (1865) and Steinmann (1888); Naef (1922) argued that argonautid octopods later grew an epipelagic shell to replace the ammonite shells when they were no...

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