blastula

early stage of an embryo produced by cleavage of an ovum; a liquid-filled sphere whose wall is composed of a single layer of cells; during this stage (about eight days after fertilization) implantation in the wall of the uterus occurs

Predasor of blastula formed by cleavage of a zygote usually seen as globular or spherical embryonic mass of blastomeres.

Predasor of blastula formed by cleavage of a zygote usually seen as globular or spherical embryonic mass of blastomeres.