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Fig. 11 | Swiss Journal of Geosciences

Fig. 11

From: First record of the brachiopod Erymnaria in the Chruteren Member (Euthal Formation) from a new Palaeogene site in the Brülisau Schuppenzone of northeastern Switzerland (Canton St. Gallen) with remarks on shell asymmetry

Fig. 11

A Asymmetric rhynchonellid costate brachiopod (Septaliphoria felberi) retaining rotational symmetry. The convergent shifted growth trajectory is visible at the anterior commissure as sharp edge. B Asymmetric rhynchonellid smooth brachiopod (Erymnaria rauschi) retaining rotational symmetry. The shifted growth trajectory (convergent) is visible at the anterior commissure in large arches, possibly caused by the reduced resistance of the smooth shell. C Asymmetric rhynchonellid brachiopods (Erymnaria polymorpha and Erymnaria sp. 1) with rotational symmetry lost

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