Now for the Phylum Mollusca, in all its glory. On Thursday we will discuss evolutionary models for the Phylum Mollusca. Of importance will be the subphyla of Amphineura, Diasoma and Cyrtosoma. Please describe their general morphology and why or why not they may have been mollusks. Say we have a bit of echinoderm ossicle in a thin-section.
All echinoderms are deuterostomes .
Please describe briefly what a water vascular system is in the echinoderms. Today's assignment is a bit different. It concerns the fossil industry of Morocco, which supplies trilobites and other fossils to an apparently insatiable American market. After reading, first tell us what effects you see that this burgeoning commerce in fossils has on the science of paleontology. On Thursday we begin our short section on trace fossils, sometimes called ichnofossils .