Opinion 437 Validation under the Plenary Powers of the generic name Pachyceras Bayle, 1878 (class Cephalopoda, order Ammonoidea) by the suppression of the name Pachyceras Ratzeburg, 1844 (class Insecta, order Hymenoptera)
Published in Opinions and declarations rendered by the International Commission on Zoological Nomenclature, in 1957, in volume 15, issue 2, pages 25-40
Date published:1957