ICZN International Commission on Zoological Nomenclature Fourth Edition - adopted by theInternational Union of Biological Sciences
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Hierarchy Of Mollusks This Alphabetized Taxonomic Index of the Phylum Mollusca is divided by class Aplacophora, Bivalvia, Cephalopoda, Gastropoda, Monoplacophora, Polyplacophora, and Scaphopoda. While some authors designate Aplacophora and Polyplacaphora as subclasses of Amphineura, this index recognizes Aplacophora and Polyplacophora as distinct classes.
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NOAA
INTEGRATED TAXONOMIC INFORMATION SYSTEM (ANIMAL, PLANT, FUNGAL, MONERA) - National Oceanic and Atmospheric Administration (NOAA) Geological Survey (USGS) Environmental Protection Agency (EPA) Agriculture Research Service (ARS), Natural Resources Conservation Service (NRCS) National Museum of Natural History (NMNH), Smithsonian Institution National Biological Information Infrastructure National Park Service Agriculture & Agri-Food Canada CONABIO, Mexico and hosted by the Department of Agriculture (USDA) Multimedia Taxonomic Database (Text & Images). "...authoritative taxonomic information on plants, animals, and microbes of North America and the world..." For more information see ITIS Home Page

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