Invertebrate Zoology continues to be the most current, up-to-date manual available. The popular phylum- by-phylum approach has been retained, providing a solid conceptual framework for advanced work in behavior, ecology, physiology, and related subjects. Numerous exercises for studying the structure and function of invertebrates are used. To complete each exercise, students must make observations, conduct investigations, and ask and answer questions � all of which helps them gain a comprehensive understanding of invertebrates.

Phylogenetic descriptions outline and review each phylum before it is studied, helping students understand the relationships and diversity among invertebrates.

Simple geological time scales trace the history of phyla with significant fossil records.

Etymon for each phylum name helps students understand the meanings of terms.

A pronunciation guide is included to help students learn new terminology quickly.

NEW�Illustrations throughout the text have been redrawn for greater clarity and new figures and photographs enhance structures and forms not shown in the line drawings.

NEW�Index has been added for ease of use.

Taxonomic Considerations and Evolution of the Invertebrates.

1. Subkingdom Protozoa.

Phylogenetic Description: The Metazoa.

2. Phylum Porifera.

Phylogenetic Description: The Radiata.

3. Phylum Cnidaria (Coelenterata).
4. Phylum Ctenophora.

Phylogenetic Description: Acoelomate Bilateria.

5. Phylum Platyhelminthes.
6. Phylum Nemertea.

Phylogenetic Description: Pseudocoelomate Phyla.

7. Phylum Gastrotricha.
8. Phylum Rotifera.
9. Phylum Acanthocephala.
10. Phylum Nematoda (Nemata, Nema).
11. Phylum Nematomorpha.

Phylogenetic Description: Phylum Mollusca.

12. Phylum Mollusca.

Phylogenetic Description: Phylum Annelida.

13. Phylum Annelida.

Phylogenetic Description: Arthropodous Phyla.

14. Phylum Onychophora.
15. Phylum Arthropoda.

Phylogenetic Description: Other Protostome Phyla.

16. Phylum Tardigrada.

Phylogenetic Description: The Lophophorates.

17. Phylum Sipuncula (Sipunculida).
18. Phylum Phoronida.
19. Phylum Bryozoa (Ectoprocta).
20. Phylum Entoprocta (Kamptozoa).
21. Phylum Brachiopoda.

Phylogenetic Description: Deuterostome Phyla.

22. Phylum Echinodermata.
23. Phylum Chaetognatha.
24. Phylum Hemichordata.

Phylogenetic Description: Phylum Chordata.

25. Phylum Chordata.

General References.
Index.