单词 | Proterostomia |
释义 | Proterostomia [´präd·ǝ·rō`stō·mē·ǝ] 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. |
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