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The blastula is an early stage of embryonic development in animals. It is also called blastosphere. It is produced by cleavage of a fertilized ovum and consists of a spherical layer of around 128 cells surrounding a central fluid-filled cavity called the blastocoel.The blastula follows the morula and precedes the gastrula in the developmental sequence.Whereas, a gastrula is a phase early in the development of animal embryos, during which the morphology of the embryo is dramatically restructured by cell migration.eport Abuse. gastrula-An embryo at the stage following the blastula, consisting of a hollow, two-layered sac of ectoderm and endoderm surrounding an archenteron that communicates with the exterior through the blastopore.