Here's a couple more papers indicating how wide psread palytoxin might potentially be:
Palytoxin congeners - PubMed
Palytoxin, isolated from a zoanthid of the genus Palythoa, is the most potent marine toxin known. Intoxication by palytoxin leads to vasoconstriction, hemorrhage, ataxia, muscle weakness, ventricular fibrillation, pulmonary hypertension, ischemia and death. Palytoxin and its numerous derivatives...
pubmed.ncbi.nlm.nih.gov
Palytoxin and Analogs: Biological and Ecological Effects
Palytoxin (PTX) is a potent marine toxin that was originally found in soft corals from tropical areas of the Pacific Ocean. Soon after, its occurrence was observed in numerous other marine organisms from the same ecological region. More recently, several ...
www.ncbi.nlm.nih.gov