One class of this phylum possesses excretory organs known as nephridia, and that same class undergoes a process known as torsion, during which the internal organs rotate and the anus becomes positioned above the head.
The trochophore is a ciliated larval stage in the life cycle of many marine organisms in this phylum. One class of this phylum possesses excretory organs known as nephridia, and that same class undergoes a process known as torsion, during which the internal organs rotate and the anus becomes positioned above the head. This phylum includes (*) chitons which possess a shell divided into eight dorsal plates. Members of this phylum have a muscular foot, a visceral mass, and a mantle, and some use a radula to scrape up food. For 10 points, name this invertebrate phylum which includes snails, clams, and the giant squid.
The trochophore is a ciliated larval stage in the life cycle of many marine organisms in this phylum.
Mollusca (or molluscs)