| Blastula | Gastrula |
| 1. Blastula is formed from morula | 1. Gastrula is formed from blastula |
| 2. It is one layered cell mass | 2. It is three layered cell mass |
| 3. The cell layer of blastula is called blastoderm | 3. The cell layers of gastrula are called ectoderm, mesoderm and endoderm |
| 4. Blastula is formed by by rapid mitotic division | 4. Gastula is formed by slow mitotic division |