Here is a link to a recent article on some Zoanthus spp. that JDR contributed too.
While this site is commercial, I think the info on this site is quite accurate and well done. The owner takes time to make sure what is posted is correct. In fact, after a few years in the research business, I think some of the most knowledgeable zoanthid people are members of the aquarium trade. Their knowledge and access to specimens remains a relatively untapped potential source of scientific learning!
So, MISE members, take the time to check out those aquarium industry booths at conferences!