Biology of the Invertebrates

<h3>1 Introduction and Environmental Considerations <h3>2 Invertebrate Classification and Relationships <h3>3 The Protists <h3>4 The Poriferans and Placozoans <h3>5 Introduction to the Hydrostatic Skeleton <h3>6 The Cnidarians <h3>7 The Ctenophores <h3>8 The Platyhelminthes <h3>9 The Mesozoand: Possible Flatworm Relatives<h3>10 The Gnathifera: Rotifers, Acanthocephalans, and Two Smaller Groups<h3>11 The Nemertines <h3>12 The Molluscs <h3>13 The Annelids <h3>14 The Arthropods <h3>15 Two Phyla of Likely Arthropod Relatives: Tardigrades and Onychophorans <h3>16 The Nematodes <h3>17 Four Phyla of Likely Nematode Relatives: Nematomorpha, Priapulida, Kinorhyncha, and Loricifera <h3>18 Three Phyla of Uncertain Affiliation: Gastrotricha, Chaetognatha, and Cyliophora <h3>19 The Lophophorates (Phoronids, Brachiopods, Bryozoans) and Entoprocts <h3>20 The Echinoderms <h3>21 The Hemichordates <h3>22 The Xenoturbellids: Deuterostomes at Last? <h3>23 The Nonvertebrate Chordates <h3>24 Invertebrate Reproduction and Development--An Overview