Ammonoid Intraspecific Variability
Zurich Open Repository and Archive University of Zurich Main Library Strickhofstrasse 39 CH-8057 Zurich www.zora.uzh.ch Year: 2015 Ammonoid Intraspecific Variability De Baets, Kenneth ; Bert, Didier ; Hoffmann, René ; Monnet, Claude ; Yacobucci, Margaret M;Klug, Christian Abstract: Because ammonoids have never been observed swimming, there is no alternative to seeking indirect indications of the locomotory abilities of ammonoids. This approach is based on actualistic com- parisons with the closest relatives of ammonoids, the Coleoidea and the Nautilida, and on the geometrical and physical properties of the shell. Anatomical comparison yields information on the locomotor muscu- lar systems and organs as well as possible modes of propulsion while the shape and physics of ammonoid shells provide information on buoyancy, shell orientation, drag, added mass, cost of transportation and thus on limits of acceleration and swimming speed. On these grounds, we conclude that ammonoid swim- ming is comparable to that of Recent nautilids and sepiids in terms of speed and energy consumption, although some ammonoids might have been slower swimmers than nautilids. DOI: https://doi.org/10.1007/978-94-017-9630-9_9 Posted at the Zurich Open Repository and Archive, University of Zurich ZORA URL: https://doi.org/10.5167/uzh-121836 Book Section Accepted Version Originally published at: De Baets, Kenneth; Bert, Didier; Hoffmann, René; Monnet, Claude; Yacobucci, Margaret M; Klug, Christian (2015). Ammonoid Intraspecific Variability. In: Klug, C; Korn, D; De Baets, K; Kruta, I; Mapes, R H. Ammonoid Paleobiology: From anatomy to ecology. Dordrecht: Springer, 359-426. DOI: https://doi.org/10.1007/978-94-017-9630-9_9 Chapter 9 Ammonoid Intraspecific Variability Kenneth De Baets, Didier Bert, René Hoffmann, Claude Monnet, Margaret M.
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