Fig. 8

Reconstructed germband of the common ancestor of crown group Chelicerata, based on several extant taxa. The upper panel represents an early stage germband with the expression of select marker genes mapped onto it. The lower panel represents a late stage germband, annotated with the adult fate of the main embryonic features. The origin of the eyes has not been reconstructed in detail, and a broad “eye field” is shown instead. See [82] for a recent detailed description of eye development in spiders. Note the distinction between the prosoma and opisthosoma