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Eumetazoa(yo͞o'mĕt'əzō`ə), subkingdom of the animal kingdom comprising all animals except the spongessponge,
common name for members of the aquatic animal phylum Porifera, and for the dried, processed skeletons of certain species used to hold water. Over 4,500 living species are known; they are found throughout the world, especially in shallow temperate waters.
..... Click the link for more information. and the wormlike mezozoans (see MezozoaMezozoa
, name of an animal subkingdom and also of the subkingdom's only phylum. The mezozoans are simple parasitic marine wormlike animals of only 20 to 30 cells, which are differentiated only into reproductive cells and ciliated cells.
..... Click the link for more information. ).
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A section of the animal kingdom that includes the phyla above the Porifera; contains those animals which have tissues or show some tissue formation and organ systems.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.