Pretty good reference links for what we are discussing here but I take them just as that.
In all my years in the hobby I have never encountered many of these things. I did get an infection from an urchin poke and the tank water getting into it.
Plus when I handle a lot of live rock, esp. well seasoned rock, my hands and fingers swell. Sometimes so bad I need some meds for it.
Thanks for posting that. I was about to respond that not all zoas have palytoxin, but it is in your second link.
I'll add bristle worm spines to the list. They are finer than hairs, and irritate like hell.