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Fossil Record A palaeontological open-access journal of the Museum für Naturkunde
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Volume 21, issue 1
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.
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

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 Michael Ramming et al.
  • 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.

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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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