Template:Ikuno & Hirano, 2015
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- Ikuno, K. & Hirano, H. 2015. Nomenclatural review of Polyptychoceras and 18 related taxa (Ammonoidea: Diplomoceratidae). Swiss Journal of Palaeontology 134: 227–232. DOI: 10.1007/s13358-015-0081-2