The lectotype of the ammonite Cadomites psilacanthus (Wermbter)

18 4 Wed, 01/01/1975 - 12:00 November 871 877

WESTERMANN, G. E. G., RIOULT, M. 1975. The lectotype of the ammonite Cadomites psilacanthus (Wermbter). Palaeontology, 18, 4, 871–877.

G. E. G. Westermann and M. Rioult The inflated 'Am. humphriesianus' d'Orbigny (1845, pl. 134, figs. 1-4), non J. Sowerby (1825), has subsequently been named three times; the oldest objective synonym is Stephanoceras psilacanthus Wermbter (1891). The lectotype has been found in the British Museum (Natural History) and is redescribed. It probably came from the boundary Humphriesianum-Subfurcatum Zones at Sully, near Bayeux, Normandy. Specimens from the Parkinsoni Zone described under Cadomites arkelli Sturani (1964), the youngest objective synonym, are C. psilacanthus sturanii subsp. nov. The Palaeontological Association (Free Access)