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Fossil Record A palaeontological open-access journal of the Museum für Naturkunde

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Foss. Rec., 21, 67-77, 2018
https://doi.org/10.5194/fr-21-67-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
20 Mar 2018
Morphology of the Early Jurassic Arietitidae and the effects of syn vivo serpulid infestations
Michael Ramming1, Dieter Korn1, Carina Klein1, and Christian Klug2 1Museum für Naturkunde Berlin, Leibniz-Institut für Evolutions- und Biodiversitätsforschung, Invalidenstraße 43, 10115 Berlin, Germany
2Paläontologisches Institut und Museum, Karl Schmid-Strasse 4, 8006 Zürich, Switzerland
Abstract. Selected specimens from the Jurassic ammonoid family Arietitidae were investigated using morphometric methods of transverse and longitudinal conch section analysis. The family Arietitidae is characterized by similarities in the conch geometry, but variation can be demonstrated by means of differences in conch morphology. Our study focuses on a specimen of the arietitid Pararnioceras sp., which revealed striking changes in conch morphology due to a syn vivo growth through a parasitic serpulid. Changes in its ontogenetic development are compared with specimens without epizoans. The ecological interpretation of the morphometric data allows the conclusion that the host possessed the ability to counteract the parasitic conch abnormalities by adapting its housing growth, thus ensuring survival.
Citation: Ramming, M., Korn, D., Klein, C., and Klug, C.: Morphology of the Early Jurassic Arietitidae and the effects of syn vivo serpulid infestations, Foss. Rec., 21, 67-77, https://doi.org/10.5194/fr-21-67-2018, 2018.
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Short summary
Selected specimens from the Jurassic ammonoid Pararnioceras sp. revealed striking changes in the conch morphology due to a syn vivo growth through a parasitic serpulid. Changes in its ontogenetic development are compared with specimens without epizoans. The ecological interpretation of the morphometric data allows the conclusion that the host possessed the ability to counteract the parasitic conch abnormalities by adapting the housing growth, thus ensuring its survival.
Selected specimens from the Jurassic ammonoid Pararnioceras sp. revealed striking changes in the...
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