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Frau, C. 2023. The systematic affinities between the Lower Cretaceous Ammonoidea Protacanthoplites abichi (Anthula, 1900) and Acanthohoplites aschiltaensis (Anthula, 1900). European Journal of Taxonomy. 888, 1 (Aug. 2023), 137–158. DOI:https://doi.org/10.5852/ejt.2023.888.2237.