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Fig. 4 | EvoDevo

Fig. 4

From: Regulation and evolution of muscle development in tunicates

Fig. 4

Illustration adapted from Tokuoka et al. [329]

Cell lineages of the tail muscles of ascidian larvae. Diagram of primary and secondary tail muscle lineage development in two species, Halocynthia roretzi and Ciona robusta. Bottom row: tailbud stages of the two species showing divergent muscle cell contributions color-coded according to conserved lineages indicated in top row (which are identical between the two species). 8-cell and tailbud stage views are lateral, 64-cell and 110-cell views are vegetal. In Halocynthia, the b4.2 blastomeres contribute to 5 muscle cells on each side of the tail, descended from b8.17 and b8.19. In Ciona, the b4.2 blastomeres gives rise to only 2 muscle cells on each side, and only b8.17 is myogenic.

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