Biology of the Invertebrates 6th Edition

1 Environmental Considerations

2 Invertebrate Classification and Relationships

3 The Protozoan Protists

4 The Poriferans and Placozoans

5 Introduction to the Hydrostatic Skeleton

6 The Cnidarians

7 The Ctenophores

8 The Platyhelminthes

9 The Gnathifera: Rotifers, Acanthocephalans, and two smaller groups

10 The Rotifers and Acanthocephalans

11 The Nemertines

12 The Molluscs

13 The Annelids

14 The Arthropods

15 Two Phyla of Likely Arthropod Relatives: Tardigrada and Onychophora

16 The Nematodes

17 Four Phyla of Likely Nematode Relatives: Nematomorpha, Priapulida, Kinorhyncha, and Loricifera

18 Three Phyla of Uncertain Affiliation: Gastrotricha, Chaetognatha, and Cyliophora

19 The Lophophorates (Phoronids, Brachiopods, Bryozoans) and Entoprocts

20 The Echinoderms

21 The Hemichordates

22 The Xenoturbellids

23 The Nonvertebrate Chordates

24 Invertebrate Reproduction and Development–An Overview