Abstract
The nomenclature of Polyptychoceras, a Late Cretaceous heteromorph ammonite genus, and 18 related taxa is examined with a view to clarifying their nomenclatural availability, authors, dates of publication, and name-bearing types, on the basis of the International Code of Zoological Nomenclature (Fourth Edition). It is concluded that one family-group name, four genus-group names, and 12 species-group names are currently available. In contrast, the names Po. subundatum and Po. jimboi are unavailable. We also showed that Po. yubarense had been established by Shimizu (J Shanghai Sci Inst, Sect II, 1(11):159–226, 1935a).
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