Echinolampas posterocrassaEchinolampas posterocrassa is an extinct species of echinolampadid echinoderm belonging to the genus Echinolampas that lived during the Eocene epoch.PalaeoecologyNumerous E. posterocrassa fossils have been found in deposits in Western Australia dating to the Middle Eocene containing boreholes evidencing that they were preyed on by cassid gastropods.