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gastraea

/^æs'tri:ә/

📖 中文释义

  1. n. 原肠动物
📘 English Definition（英文释义）
  1. n. A primeval larval form; a double-walled sac from which,
  2. according to the hypothesis of Haeckel, man and all other animals, that
  3. in the first stages of their individual evolution pass through a
  4. two-layered structural stage, or gastrula form, must have descended.
  5. This idea constitutes the Gastraea theory of Haeckel. See Gastrula.