"This textbook is about Environmental Considerations, Invertebrate Classification and Relationships. Including The Protozoan Protists, The Poriferans and Placozoans, Introduction to the Hydrostatic Skeleton, The Cnidarians, The Ctenophores, The Platyhelminthes, The Gnathifera: Rotifers, Acanthocephalans, and two smaller groups."
"This new edition is the most readable invertebrate biology text you'll find. Respected author Jan Pechenik has designed Biology of the Invertebrates for one-quarter and one- semester courses. The text covers all phyla of invertebrates; emphasizes the unifying characteristics within each group; and prepares students to read and understand the primary research literature. All chapters in the third edition contain excellent reference sections that have been updated to reflect the latest information about physiology, systematics, and phylogenetic relationships. You'll also find material covering recent findings using molecular techniques. - Publisher."
""This textbook is the most concise and readable invertebrates book in terms of detail and pedagogy (other texts do not offer boxed readings, a second color, end of chapter questions, or pronunciation guides). All phyla of invertebrates are covered (comprehensive) with an emphasis on unifying characteristics of each group."--Publisher's website."