Table 1 Embryonic stages of C. salei according to Wolf and Hilbrant (2011) that are relevant for eye formation
Stage | Hours after fertilisation | Days | Name of stage | Description of stage relevant to eye formation |
|---|---|---|---|---|
Stage 11 | 100 to 130 | 4-5-6 | Prosomal limb buds | Progression in the formation of bilateral cheliceral lobes |
Stage 12 | 160 to 180 | 6-7-7.5 | Lateral furrow | Formation of kidney-shaped folds lateral to stomodaeum (lf) |
Stage 14 | 160 to 180 | 6-7-7.5 | Inversion I | Migration of lateral subdivision (ls) in the direction of lf and partly covering it |
| Â | Â | Â | Formation of a crescent-shaped anterior furrow (af) | |
Stage 16 | 180 to 220 | 7.5-9 | Inversion III | Tissue from ls completely covers the lf |
| Â | Â | The growth of medial subdivisions (ms) anteriorly, partly covering the af | ||
Stage 18 | 180 to 220 | 7.5-9 | Prosomal shield | Growth of the rim of precheliceral lobes in the direction of mouth opening |
| Â | Â | Formation of eye vesicles | ||
Stage 20 | 220 to 280 | 9-11 | Ventral closure | Distinct brain regions such as optic ganglia are evident, all four pairs of eyes are formed but not pigmented |