I have this fella on my 1st part of the package. HAs anyone else seen this guy on thier rock? CAn any one ID this? It kinda looks like a porcelin crab but im not 100% sure. Right now he is in the 5 gallon tank just in case hes not reef safe!!
If I recall Fenner's "Conscientious Marine Aquarist" (or maybe it was Fenner/Calfo "Reef Invertebrates"), porcelain crabs have one less set of visible legs. Not counting the big claws, only 3 sets of visible legs, versus 4 for all the other crabs.
I've got a picture posted here someplace (in a post, not in gallery) of a red emerald crab, which is a less desirable hitchhiker.
I found 2 of those porelain crabs when I got my rock 6 months ago......now I have 8-12 of them....they have yet to cause a problem and seem like they just filter feed with their "catchers mits".
Does anyone know if these breed in aquariums or were they just really small when I got them?