There was a family of these anemonefish in an anemone just off one of the resorts on Mabul Island in the Celebes Sea. I can determine what species they are. The closest appears to be Amphiprion clarkii but the tail being black and the third white band being quite thick suggest otherwise.
Here's a juvenile:
Here's an adult (probably the female):
Any ideas?
I've seen quite a lot of those in the Lembeh Strait. I think they are saddleback anemonefish, Amphiprion polymnus.
Yes, it is an Amphiprion polymnus.
An excellent book on Anemonefishes ist Daphne Fautins, unfortunately no new one to buy at the moment:
I had actually been using the online version of Fautin and Allen and didn't feel their description sufficiently covered the exception to the saddle:
Colour features and size: Dark brown with broad white bar just behind eye; on middle of back an abbreviated white saddle or on middle of the side a partial to complete white bar that slants slightly backwards, extending onto middle and rear parts of dorsal fin; caudal fin mainly dark brown with broad whitish margins, the dark part tapering in width posteriorly; breast and belly either yellow orange or dark brown. Maximum length about 120 mm.
I guess it is all in the interpretation of "partial to complete white bar". I interpreted it incorrectly.