Very cool find from last spring- a Florida vinegaroon (Mastigoproctus floridanus) that was hiding inside a rotting log.
despite her impressive size, this rarely encountered Florida endemic is actually the smallest of the 3 vinegaroons in the US, and some of the Mastigoproctus species from Mexico and southwards get even larger.
and yes they’re called vinegaroons (among other fun names) because they squirt concentrated vinegar from their butt as a chemical defense
I have long accepted the weird fact that sea spiders's digestive systems extend into their legs, but did not know that this also applies to their gonads..