Fig. 1.

Tree representation and fate map of the tunicate Oikopleura dioica. Colors indicate different tissues identifiable at hatching. The nomenclature is according to Conklin (18) and Nishida (19) [Table S2 can be consulted to translate this nomenclature to the one used by Delsman (15)]. Note overall correspondences between tissue fates of left and right sides. Arrows indicate obvious deviations from bilateral symmetry in the muscle and notochord lineages. The asterisk indicates the time of fertilization; the arrowhead marks the time of hatching.