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Brief Contents 1 Environmental Considerations 2 Invertebrate Classification 3 The Protozoans 4 The Poriferans and Placozoans 5 Introduction to the Hydrostatic Skeleton 6 The Cnidarians 7 The Ctenophores 8 The Platyhelminthes 9 Possible Flatworm Relatives: The Mesozoans 10 The Nemertines 11 The Rotifers and Acanthocephalans 12 The Molluscs 13 The Annelids and Sipunculans 14 The Arthropods 15 Two Phyla of Likely Arthropod Relatives: Tardigrades and Onychophorans 16 The Nematodes 17 Four Phyla of Likely Nematode Relatives: Nematomorpha, Priapulida, Kinorhyncha, and Loricifera 18 Five Phyla of Uncertain Affiliation: Myxozoa, Gnathostomulida, Gastrotricha, Xenoturbella bocki, Chaetognatha, and Cyliophora 19 The Lophophorates (Phoronids, Brachiopods, Bryozoans) and Entoprocts 20 The Echinoderms 21 The Hemichordates 22 The Nonvertebrate Chordates 23 Invertebrate Reproduction and Development—An Overview Glossary Index