Figure 7

Larval molecular territories and cell types show global conservation of ancient larval patterning. For animals in which molecular data is available, spatial transcription factor expression data have been mapped onto the larval body plan (larvae as seen from the ventral side; amphioxus is pictured from a dorsal perspective). Morphologically described or ‘molecularly footprinted’ cells found in the apical organ are pictured above larval forms. The activity of Wnt signaling on larval body formation is pictured with bars flanking the larvae. Data is compiled from this and previous studies in Cephalochordata [45, 59, 65–73], Hemichordata [9, 25, 41, 43, 60, 74–77], Echinodermata [26, 32, 36, 37, 42, 48, 78–83], Mollusca [24, 84] and Cnidaria [30, 40, 44, 64, 85–90].