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      Intraspecific variation of phragmocone chamber volumes throughout ontogeny in the modern nautilid Nautilus and the Jurassic ammonite Normannites

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          Abstract

          Nautilus remains of great interest to palaeontologists after a long history of actualistic comparisons and speculations on aspects of the palaeoecology of fossil cephalopods, which are otherwise impossible to assess. Although a large amount of work has been dedicated to Nautilus ecology, conch geometry and volumes of shell parts and chambers have been studied less frequently. In addition, although the focus on volumetric analyses for ammonites has been increasing recently with the development of computed tomographic technology, the intraspecific variation of volumetric parameters has never been examined. To investigate the intraspecific variation of the phragmocone chamber volumes throughout ontogeny, 30 specimens of Recent Nautilus pompilius and two Middle Jurassic ammonites ( Normannites mitis) were reconstructed using computed tomography and grinding tomography, respectively. Both of the ontogenetic growth trajectories from the two Normannites demonstrate logistic increase. However, a considerable difference in Normannites has been observed between their entire phragmocone volumes (cumulative chamber volumes), in spite of their similar morphology and size. Ontogenetic growth trajectories from Nautilus also show a high variation. Sexual dimorphism appears to contribute significantly to this variation. Finally, covariation between chamber widths and volumes was examined. The results illustrate the strategic difference in chamber construction between Nautilus and Normannites. The former genus persists to construct a certain conch shape, whereas the conch of the latter genus can change its shape flexibly under some constraints.

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                Author and article information

                Contributors
                Journal
                PeerJ
                PeerJ
                PeerJ
                PeerJ
                PeerJ
                PeerJ Inc. (San Francisco, USA )
                2167-8359
                6 October 2015
                2015
                : 3
                Affiliations
                [1 ]Paläontologisches Institut und Museum, Universität Zürich , Zürich, Switzerland
                [2 ]Laboratory of Physical Anthropology, Graduate School of Science, Kyoto University , Kyoto, Japan
                [3 ]Faculty of Environment and Information Sciences, Yokohama National University , Yokohama, Japan
                Article
                1306
                10.7717/peerj.1306
                4614987
                © 2015 Tajika et al.

                This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited.

                Funding
                Funded by: Swiss National Science Foundation SNF
                Award ID: 200020_132870
                Award ID: 200020_149120
                Award ID: 200021_149119
                This study is supported by the Swiss National Science Foundation SNF (project numbers 200020_132870, 200020_149120, and 200021_149119). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
                Categories
                Developmental Biology
                Evolutionary Studies
                Marine Biology
                Paleontology
                Zoology

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