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Unformatted text preview: Eumetazoan (yu'-met-uh-zo'-un) Member of a clade of animals with true tissues. All animals except sponges and a few other groups are eumetazoans. Gastrula (gas-tru-luh) An embryonic stage in animal development encompassing the formation of three layers: ectoderm, mesoderm, and endoderm. Gastrulation (gas-tru-la-shun) In animal development, a series of cell and tissue movements in which the blastula-stage embryo folds inward, producing a three-layered embryo, the gastrula....
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- Spring '10