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Annelida a phylum of segmented worms that includes earthworms and leeches.
bryozoan any of a phylum (Bryozoa) of sessile invertebrate animals that uses tentacles to remove food particles from water.
class in biology, the subdivision of a phylum or a division. [1/8 definitions]
mollusk any of a large phylum of mostly marine invertebrates, including snails, clams, squid, and octopuses, that have soft unsegmented bodies usu. covered by a shell.
phyla pl. of phylum.
Polychaeta a class of worms in the phylum Annelida characterized by bristled appendages and usu. living in ocean water.
subphylum any major subdivision of a phylum; group of related classes of living things.
superclass a taxonomic category intermediate between a phylum, or a botanical division, and a class; subphylum.