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- proper n. A taxonomic class within the phylum Mollusca — the bivalve molluscs.
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Paula Mikkelsen Paleontological Research Institution, Ithaca, NY: BivAToL project funded by the National Science Foundation to reconstruct the phylogenetic relationships of the Bivalvia.
Among Caspian [mollusk | molluscs]], 119 endemic and subendemic species belong to two families of Bivalvia (Dreissenidae and Lymnocarduidae) and seven families of Gastropoda.
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