Phil,
That really only means that one group has analyzed the fish and (as the headline says) is SUGGESTING that Premnas "isn't a valid genus". Taxonomists still have to accept the change and it is possible that in a few years, somebody will change it back...taxonomists need job security you know! If you go back to Jerry Allen's 1972 book, Anemonefishes, he only gives Premnas subgenus status, listing the fish as Amphiprion biaculeatus, so things have come full circle.
Like I said, some taxonomists are lumpers, some are splitters. I appreciate the fact that they used genetics and not just morphometrics for their analysis, but this was a really lame statement: "...has provided evidence to suggest that all clownfishes are descendents of a common ancestor". Phew, by that logic, you could lump the genus of chimpanzee with the same genus as humans.
(As a side note, I had originally wrote the previous line as, "the genus Pan with the genus ****" but had to edit it, because the online word police blocked my typing the genus name for humans - how sad!)
I was once imperiously informed by a young biologist that a sign over one of the exhibits at the aquarium that I work at "was wrong - the name had been changed". By the time I got around to updating the sign's scientific name a year later, the name had been changed back<grin>.
Jay Hemdal