What is this Coral?

[Myka]

Originally Posted by Snappy

It's not porites, that is actually a variety of Siderastrea sp. which is considered an LPS. They can extend fairly long sweepers at night so give it some room.

I've never even heard of this species...how does it differ from Porites? It looks VERY similar. If this is true (and I doubt it very little), then I bet there are A LOT of misidentified Porites out there!