Fig. 1.

Morphology of parental species and tetraploid hybrid animals. (A) Dorsal view of A. inornata (Left), A. exsanguis (Right), and the A. exsanguis/A. inornata hybrid (Center). (Scale bar, 10 mm.) (B) Individuals representing the first (H1, Left), second (H2, Center), and third (H3, Right) hybrid generation of the tetraploid species. The H1 and H2 individuals are adults photographed on day 1,168 and 645 after hatching, respectively. The H3 individual is shown at an age of 44 d and displays the color and pattern typical for juveniles.