|
Cleavage
|
1A
|
0–6
|
1.8
|
Nuclei divide internally
|
|
1B
|
6–12
|
3.6
|
Nuclei reach the periphery
|
|
Blastoderm
|
2A
|
12–18
|
5.3
|
Formation of germ rudiment
|
|
2B
|
18–24
|
7.1
|
Nuclei progressively concentrate at egg posterior
|
|
Gastrulation
|
3A
|
24–30
|
8.9
|
Germ rudiment invagination begins
|
|
3B
|
30–36
|
10.7
|
Germ band extension
|
|
Segmentation
|
4
|
36–48
|
14.3
|
Anterior segmentation (in head and thorax) begins
|
|
5
|
48–60
|
17.9
|
Appendage buds appear; non-segmented abdomen
|
|
6
|
60–72
|
21.4
|
Appendages grow;
|
|
segmented abdomen; neural groove evident
|
|
Growth
|
7
|
72–84
|
25
|
Thoracic appendages elongate, bigger than head appendages
|
|
8
|
84–96
|
26.6
|
Antennal appendages grow over first maxillary appendages
|
|
9
|
96–108
|
32
|
First maxillary appendages hidden by antennal appendages; embryo shortens and widens (germ band retraction)
|
|
Katatrepsis and Dorsal Closure
|
10
|
108–132
|
35
|
At the end of katatrepsis, embryo and egg anterior-posterior axes coincide; embryo closes dorsally
|
