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18 Cards in this Set
- Front
- Back
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Acoelomate
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A solid-bodied animal lacking a cavity between the gut and outer body wall.
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Anterior
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Referring to the head end of a bilaterally symmetrical animal.
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Archenteron
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The endoderm-lined cavity, formed during the gastrulation process, that develops into the digestive tract of an animal.
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Bilateral Symmetry
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Characterizing a body form with a central longitudinal plane that divides the body into two equal but opposite halves.
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Blastula
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The hollow ball of cells marking the end stage of cleavage during early embryonic development.
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Cleavage
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The succession of rapid cell divisions without growth during early embryonic development that converts the zygote into a ball of cells.
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Diploblastic
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Having two germ layers.
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Dorsal
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Pertaining to the back (top) of a bilaterally symmetrical animal.
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Gastrulation
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The formation of a gastrula from a blastrula.
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Ingestion
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A heterotrophic mode of nutrition in which other organisms or detritus are eaten whole or in pieces.
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Larva
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A free-living, sexually immature form in some animal life cycles that may differ from the adult in morphology, nutrition, and habitat.
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Mesoderm
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The middle primary germ layer of an early embryo that develops into the notochord, the lining of the coelom, muscles, skeleton, gonads, kidneys, and most of the circulatory system.
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Metamorphosis
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The resurgence of development in an animal larva that transforms it into a sexually mature adult.
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Posterior
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Pertaining to the rear, or tail end, of a bilaterally symmetrical animal.
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Pseudocoelom
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An animal whose body cavity is not completely lined by mesoderm.
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Radial Symmetry
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Characterizing a body shaped like a pie of barrel, with many equal parts radiating outward like the spokes of a wheel.
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Triploblastic
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Possessing three germ layers: the endoderm, mesoderm, and ectoderm.
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Ventral
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Pertaining to the underside, or bottom, of a bilaterally symmetrical animal.
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