We've covered most of Spiralia, but now it's time to dive into the final subclade, Lophotrochozoa. This contains several phyla, the most diverse of which is Mollusca. This phylum includes snails, slugs, octopuses, squids, oysters, scallops, and so many other familiar animals. Let's get a general breakdown of the phylum first, and then we will go into each class in more detail.

Script by Ryan Helcoski

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