gastraea
^æs'tri:ә
基本解释
n. 原肠动物
英文释义
n. A primeval larval form; a double-walled sac from which,
according to the hypothesis of Haeckel, man and all other animals, that
in the first stages of their individual evolution pass through a
two-layered structural stage, or gastrula form, must have descended.
This idea constitutes the Gastraea theory of Haeckel. See Gastrula.
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