IDANOCERAS, A NEW HETEROMORPH AMMONITE GENUS FROM THE LATE ALBIAN OF EASTERN AUSTRALIA

Henderson and McKenzie suggest that Late Albanian diversification of the members of the Labeceratidae occupied the niches available to ammonites of heteromorph morphology in the Australian epeiric sea, to the exclusion of pandemics. Part of that evolutionary diversification is documented here in the form of a new monotypic genus, Idanoceras, a novel representative of the Labeceratidae affiliated to, and perhaps derived from, Labeceras.