Stemann, Thomas; Mitchell, Simon
Author Affiliation, Ana.
A new rudist from the Santonian of Jamaica.
Caribbean Journal of Earth Science
Date of Publication
A new rudist bivalve, Contraspira khanae gen. et sp. nov., is described from the late Santonian Back River Formation of central Jamaica. This taxon has a right valve similar to that of Durania, showing polygonal cellular microstructure, radial plications on the commissure and depressed radial bands. The left valve coils ventrally and is the most diagnostic character of the genus, since other radiolitid rudists have left valves that coil dorsally. The lower part of the body cavity of the right valve, and the whole of the left valve are filled with large cellular structure developed in the inner shell layer. The species is a unique member of the late Santonian fauna of Jamaica.....