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Part of the "Branches on the Tree of Life" series. Phylum Mollusca is the second most diverse phylum of animals, with over 100,000 known species. First examined are the basic characteristics of the phylum-a soft body, muscular foot, mantle cavity with gill, and hard calcified shell. Studies the four most familiar classes of molluscs (chitons, gastropods, bivalves, and cephalopods) in depth, viewing structure, life history, adaptations, and ecological interactions.
(Source: DCMP)
Part of the "Branches on the Tree of Life" series. Worms with segmented bodies make up the phylum Annelida. Explores the three classes of annelids: Class Polychaeta (feeding, locomotion, and larval stages), Class Oligochaeta (lifestyles, feeding adaptations, and anatomy of freshwater oligochaetes and earthworms), and Class Hirudinea (leeches, crayfish, and worms show adaptations for commensal, parasitic, and scavenger lifestyles). DNA evidence places annelids close to the molluscs on the tree of life.