immediately_preceded_by developmental stage Medaka stage 7 Medaka stage 8 OlatDv:0000110 Zoological Science 11: 825-839 (1994) - 4 hrs 5 min Stage 8 (4 hrs 5 min) Early morula stage: The planes of the sixth and later cleavages are difficult to precisely trace. The blastomeres (64-128) have different cleavage planes depending on their positions within the dome-shaped blastoderm and are arranged in 3 layers. The peripheral blastomeres (21-24) are flattened in shape. The cells (30-35 m in diameter) are arranged in 3-4 layers but are still easily dissociated from each other [31]. - 4 hrs 5 min early morula stage medaka_ontology