Incluye referencia bibliográfica e índice CONTENIDO: What do we mean by freshwater invertebrates?. -- Why study freshwater invertebrates?. -- Classification of freshwater invertebrates. -- Fundamentals of freshwater ecology. -- Fundamentals of freshwater invertebrate biology. -- How to study freshwater invertebrates. -- Identification of different kinds. -- Identification of different kinds. -- Quickguide to major groups of freshwater invertebrates. -- Flatworms. -- Leeches. -- Aquatic earthworms. -- Snails. -- Mussels, clams. -- Water mites. -- Crustaceans. -- True bugs. -- Water beetles-adults. -- Dragonflies, damselflies. -- Stoneflies. -- Mayflies. -- Dobsonflies, fishflies, hellgrammites, alderflies. -- Caddisflies. -- Water beetles-Larvae. -- True flies. -- References on identification of different kinds of freshwater invertebrates. -- Information about different kinds. -- flatworms. -- Segmented worms. -- Aquatic earthworms. -- Leeches. -- Mollusks. -- Snails. --Mussels, clams. -- Arthropods. -- Water mites. -- Crustaceans. -- Aquatic sow bugs. -- Scuds, sideswirmmers. -- Decapods. -- Aquatic insects. -- Mayflies. -- Dragonflies, Damselflies. -- Stoneflies. -- True bugs. -- Dobsonflies, fishflies, hellgrammites, alderflies. -- Water beetles. -- Caddisflies. -- True flies. References on information about different kinds of freshwater invertebrates.