Opinion 557: Designation under the Plenary Powers of a Type Species in Harmony with Accustomed Usage for the Nominalgenus Calycoceras Hyatt, 1900 (Class Cephalopoda, Order Ammonoidea)

London International Commission On Zoological Nomenclature
Opinions and Declarations Rendered by the International Commission on Zoological Nomenclature, Volume 20, pp. 265-276
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