Figure 1.

Morphological changes associated with tail resorption during M. fissipes metamorphosis. (A) A representative M. fissipes animal at indicated developmental stages from S39 (around the onset of metamorphosis) to S45 (end of metamorphosis) is shown together with typical age (in days, d) of the animal when reared at 22.9–25.4°C. Shown at the bottom are the corresponding stages of X. laevis animals and their ages when reared at 22–24°C (28), scale bar: 5 cm. (B) Lateral views of the tail at indicated developmental stages.