The Late Maastrichtian bourgueticrinid crinoid Dunnicrinus aequalis (D'Orbigny, 1841) from The Netherlands and Belgium

The bourgueticrinid "Bourgueticrinus" aequalis D'ORBIGNY, 1841 is by far the commonest Late Cretaceous crinoid species in the type area of the Maastrichtian Stage (NE Belgium, SE Netherlands). Many hundreds of thousands of dissociated ossicles, of crowns and columns alike, have been collected during recent years. Based on the Structure of the crown (number of arms and brachial articulation types), the species is best reclassified in the otherwise exclusively North American genus Dunnicrinus MOORE, 1967. It is particularly well represented in the Lanaye (Gulpen Formation), Valkenburg and Gronsv... Mehr ...