Proterostomia
Proterostomia
[‚präd·ə·rō′stō·mē·ə] (zoology)
That part of the animal kingdom in which cleavage of the egg is of the determinate type; includes all bilateral phyla except Echinodermata, Chaetognatha, Pogonophora, Hemichordata, and Chordata.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive
The principal difference in cellular mechanisms of heart-muscle growth between Deuterostomia and
Proterostomia may be accounted for by different origin and development of cardiogenic mesoderm in these two main phylogenic taxa.
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