All other Asian Bombina are considered part of the B.maxima complex, and tend to be included as subspecies or synonyms. There is also a very large distance between the typical collection sites of B.orientalis in northeastern China or Korea, and tropical or subtropical China and southeast Asia. I don't think there's any chance of this being any member of the B.maxima complex.
Hi there,
All of you were absolutelly right: this is just a little strange B. orientalis.
The male is vocalizing typically and often seen in amplexus with any of two my green females of B. orientalis. I‘m keeping, and sometimes breeding, the Oriental Fire Belly Toad for several years, but newer paid much attention for distribution of warts on their flanks.
When I noted this unusually dark belly, combined with irregular pattern of green on him, I've compared him to my other 5 FBT. All of them have warty flanks with no distinctive border between lover smooth areas and warty upper ones. Sure, it was not enough representative excerption to post my alarming question, - I’m sorry for that and thank all of you for you commentaries.
Alex