| Insemination |
0 h |
0 h |
| Two-cell |
45 min |
30 min |
| Four-cell |
60 min |
50 min |
| Eight-cell |
90 min |
60 min |
| 16-cell |
2 h |
70 min |
| 32-cell |
2.25 h |
90 min |
| 64-cell |
2.5 h |
105 min |
| 128-cell |
3 h |
2 h |
| Blastula |
4 h |
2.5 h |
| Onset of gastrulation |
4.5 h |
3.5 h |
| Mid-gastrula (cup-shaped) |
6 h |
4.5 h |
| Late gastrula (ciliated, begins rotating) |
8 h |
5.5 h |
| Early neurula (0 somites) |
8.5 h |
6 h |
| Hatching |
10 h |
7 h |
| Mid-neurula (three to five somites) |
12 h |
8 h |
| Late neurula (nine or 10 somites) |
20 h |
12 h |
| Early larva (knife-shaped) |
24 h |
15 h |
| First gill slit, mouth and anus open |
36 h |
28 h |
| Two gill slits |
48 h |
36 h |
