Zoanthus sociatus

I went into Boston this week and spent an afternoon soaking up inspiration at the New England Aquarium.  As usual, I spent some time transfixed at the live coral display.  I particularly love these guys, who are Zoanthus sociatus or Button Polyps.  They mostly reproduce by budding asexually and thus form dense colonial mats.  Wikipedia tells me that since they are a member of Hexacorallia each polyp should have tentacles in multiples of six, but I’m too lazy to count.