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20 Cards in this Set
- Front
- Back
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blastula
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an early embryonic stage, usually a hollow ball of cells
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gastrula
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when one side of the blastula folds inward, forming a stage
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larva
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an immature individual that looks different from the adult animal
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metamorphosis
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when larva undergoes a major change of body form, in becoming an adult capable of reproducing sexually
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radial symmetry
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identical all around a central axis
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bilateral symmetry
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there's only one way to split it into two equal halves - right down the midline
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body cavity
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a fluid-filled space separating the digestive tract from the outer body wall
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pseudocoelom
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if the body cavity is not completely lined by tissue derived from mesoderm
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coelom
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the type of body cavity humans and many other animals have, is completely lined by tissue derived from mesoderm
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invertebrates
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animals without backbones
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sponges
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once grouped in phylum Porifera. stationary animals that appear so sedate they used to be thought of as plants
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gastrovascular cavity
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the basic body plan of a cniadrian is a sac with a central digestive compartment
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polyp
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stationary body plan of cnidarians
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medusa
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floating body plan of cnidarians
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molluscs
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snails, slugs, oysters, and clams, octopuses, and squids. Soft-bodied animals, but most are protected by a hard shell
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radula
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used by molluscs to feed, a file-like organ
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mantle
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drapes over the visceral mass and secretes the shell if one is present
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gastropods
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protected by a single spiraled shell into which the animal can retreat when threatened
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bivalves
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have shells divided into two halves hinged together
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cephalopods
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all marine animals and generally differ from gastropods and sedentary bivalves, in that their bodies are fast and agile
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