Eucoelomata

Eucoelomata

[yü‚sē·lə′mäd·ə]
(zoology)
A large sector of the animal kingdom including all forms in which there is a true coelom or body cavity; includes all phyla above Aschelminthes.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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For more than a century, the Bilateria have traditionally been divided into Protostomia and Deuterostomia (or through a misinterpretation of Hyman, 1951, into Acoelo-mata, Pseudocoelomata, and Eucoelomata. a concept that unfortunately seems to survive in some American textbooks).