Unfortunately, there's probably a billion species of zoanthids...and it's next to impossible to nail down a species name especially without knowing where they came from.
If you're looking for a name for them...you get into a fun debate. For the higher end corals, if they have a name, they'd better have a lineage. It's frustrating as a potential buyer when someone lists a "Superman Montipora". You expect a bright baby blue base with screaming red polyps...and then the person gives you *their* version of the "Superman Montipora" b/c they think it looks close enough to sell it at a higher price...so you get a dull blue base with brownish red polyps.
But, there are plenty of people who say that since something *looks* like a named coral, it is that coral. Anywho...
www.zoaid.com