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9 Cards in this Set
- Front
- Back
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Three Types of Symmetry
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Bilateral, Radial, Assymetry
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Bilateral Symmetry
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Advanced animals.
Right and left sides are mirror images. Shows cephalization (development of a head region) |
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Radial Symmetry
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Primitive animals.
Like spokes of a wheel. --ex. Corals, jellyfish |
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Asymmetry
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Lack symmetry--shape is amorphous (w/out form).
Porifera--sponges |
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Acoelomates
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Triploblasts with solid bodies.
No cavity between digestive tract and outer body wall. Includes Platyhelminthes (flatworms) |
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Pseudocoelomates
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Body cavity only partially lined by mesoderm.
Includes Nematodes (round worms) |
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Coelomates
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True fluid-filled coelom completely lined with mesoderm tissue.
Provides space for elaboration of organ systems. Includes Annelids, Mollusk, Arthropods, Echinoderms, Chordates. Subdivided into portostomes and deuterostomes. |
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Protostome Coelomates
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True coelom.
1st opening during embryonic development becomes the mouth, 2nd opening becomes the anus. Includes annelids, mollusks, and arthropods. |
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Deuterostome Coelomates
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True coelom.
1st opening during embryonic development becomes the anus, 2nd opening becomes the mouth. Includes chordates and echinoderms. |
