I love your site–I use it to identify caterpillars all the time. My boyfriend and his brother found this spider in a tunnel in some ruins of an old sugar plantation on St. Kitts W.I. With legs, it was roughly 4 or 5 inches in diameter (and it had plenty of company!) It looks kind of like a giant crab spider to me, but the "pincers" in ours are quite thick and armored and have spikes on them. Can you help? Thanks!
This is not a spider, but a Tailless Whipscorpion, a shy and harmless creature unless you are a small edible critter like a cricket.