Opinion 422 Determination under the Plenary Powers of the species to which the specific name mammillatus Schlotheim, 1813, as published in the combination ammonites Mammillatus shall apply and designation under the same Powers of the foregoing species to be the type species of the genus Douvilleiceras de Grossouvre, 1893 (class Cephalopoda, order Ammonoidea)
Published in Opinions and declarations rendered by the International Commission on Zoological Nomenclature, in 1956, in volume 14, issue 6, pages 181-196
Date published:1956