Opinion 235 Designation, under the Plenary Powers, of a lectotype for the nominal species ammonites Cordatus Sowerby (J.), 1813 (class Cephalopoda, order Ammonoidea)
Published in Opinions and declarations rendered by the International Commission on Zoological Nomenclature, in 1954, in volume 4, issue 25, pages 313-328
Date published:1954-05-21