Fig. 3From: An embryological perspective on the early arthropod fossil recordReconstructed germband of Opabinia regalis. 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. Note the close antero-medial position of the paired frontal appendage anlagen. These are assumed to fuse at dorsal closure to give a single appendage. The origin of the eyes has not been reconstructed in detail, and a broad “eye field” is shown insteadBack to article page