Bio ch 32 terms.docx 4

Bio ch 32 terms.docx 4 - Eumetazoan (yu'-met-uh-zo'-un)...

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identified as a clade by molecular evidence. Many ecdysozoans are molting animals. Ectoderm (ek´-to-durm) The outermost of the three primary germ layers in animal embryos; gives rise to the outer covering and, in some phyla, the nervous system, inner ear, and lens of the eye. Endoderm (en´-do-durm) The innermost of the three primary germ layers in animal embryos; lines the archenteron and gives rise to the liver, pancreas, lungs, and the lining of the digestive tract in species that have these structures.
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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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