Aquatic Biota Biocriteria Glossary Glossary and Key Word List Definition: Collective term describing the organisms living in or depending on the aquatic environment. Aquatic Biota Aquatic Biodiversity Glossary Glossary and Key Word List Definition: Collective term describing the organisms living in or depending on the aquatic environment. Aquatic Biota EPA EV-Biological Substances Taxonomy Definition: Collective term describing the organisms living in or depending on the aquatic environment. [Aquatic Biodiversity Glossary]