Zoanthids (which is apparently refers to all corals of the Zoanthraria order) include the genus Palythoa, which is toxic as mentioned above, but no other Zoanthid genus has been shown to contain palytoxin.
Here's an excellent 2-part series by an esteemed zoologist discussing Zoa toxicity:
The oceans are full of creatures capable of killing us; one of the more surprising marine menaces is a group of popular aquarium corals known variably as “but
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(Continued from Part 1) When it comes to toxic palys, it is the drab brown specimens that we see most often, but there may be at least some colorful phenotyp
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Palytoxin has only been found in Palytho spp. (spp is the abbreviation for plural species), some dinoflaggelates (Ostreopsis spp.) and some cyanobacteria (Trichodesmium spp.)
If you have more literature or examples, then please share and correct me.