the most up-to-date and informative text of its kind. The coverage includes all freshwater invertebrate phyla with an emphasis on ecological information. Each chapter contains ecological and morphological information and a key to genera (or family for insects) as well as a bibliography and list of further readings. A glossary and subject index are included at the end of the book. The text is written at a median level of difficulty and geared toward researchers and upper-undergraduate and graduate students. Highlights of the text:* Taxonomic keys for all groups* Generously illustrated* Includes taxa distributed in Canada* Taxonomic index

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