Archiblastula :: Archiblastula (n.) A hollow blastula, supposed to be the primitive form; a c/loblastula..

Blastula :: Blastula (n.) That stage in the development of the ovum in which the outer cells of the morula become more defined and form the blastoderm.

Blastule :: Blastule (n.) Same as Blastula.

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