Ammonoidea
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Ammonoidea
(′a·mə′nöid·ē·ə)
(paleontology) An order of extinct cephalopod mollusks in the subclass Tetrabranchia; important as index fossils.
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McGraw-Hill Science & Technology Dictionary
McGraw-Hill Dictionary of Scientific and Technical Terms. Copyright © 2003, 1994, 1989, 1984, 1978, 1976, 1974 by McGraw-Hill Companies, Inc. All rights reserved.
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