Among 22 species and subspecies of the frogs (Hylidae, Ranidae, Rhacophoridae, and Microhylidae), 48 kinds of hybridization experiments were performed. Metamorphoses occurred in only two hybrids,
Hyla arborea japonica _??_ X
H. hallowellii _??_ and
Rhacophorus v. viridis _??_ X
Rh. v. owstoni _??_, but they had abnormal gonads immediately after metamorphoses. These and previously reported results lead to the conclusion that the postmating isolation mechanisms in Japanese frogs are nearly complete except within the pond frog (
R. nigromaculata) group.
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