I hate to wake in on controversial topics.
After reading several papers and articles on Palytoxin, I believe that the toxin is limited to a very few number of Palythoas...and not Zoanthids.
I also believe that many "unexplained" illnesses are blamed on this toxin when there are many more reasonable common causes for them...and hence the hype of Palytoxins.
Actually I think its a good discussion.
1. It gets confusing. Palythoa is a Zoanthid. "While the most well-known zoanthids are the zooxanthellate genera found in tropical and sub-tropical waters (primarily
Zoanthus and
Palythoa), many other species and genera exist, some still relatively unknown to science.
[4][5][6][7] Many zoanthids (in particular the genera Epizoanthus and Parazoanthus) are often found growing on other marine invertebrates." So when you talk about differentiating 'Zoas' and 'Palys' to me its important to be sure you're talking about the same thing.
2. Palytoxin is widespread: "
Palytoxin occurs at least in tropics and subtropics where it is made by Palythoa corals and Ostreopsis dinoflagellates, or possibly by bacteria occurring in these organisms. It can be
found in many more species like fish and crabs due to the process of biomagnification."
3. At least according to the government of South Australia, Both Palythoa and Zoanthus can contain palytoxin: "What is Zoanthid Coral? ... These decorative ornamental corals
are commonly called 'button polyps', 'sun polyps' or 'zoas'. Species of Zoanthid coral (e.g. Palythoa species and
Zoanthus species)
can contain a highly toxic, naturally-occurring and potentially lethal substance known as
Palytoxin."
Not pointing this out to agree - but to agree with you that there is a lot of information out there that is contradictory - and whether only 10, 50, or 99 percent of 'cases' are something else, to me, the discussion underscores the fact that there are lots of things in our tanks that can cause significant illness (though rare), and that proper careful handling of fish and corals will prevent most of these issues.