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I think #3 is a Gorilla Crab? I had one come in on my TBS rock as a tiny baby and had no clue until I saw it devouring my mushroom coral.# 1 is a decorator crab - considered reef-safe with caution (may or may not go after corals).
# 2 looks like a red Mithrax crab (as safe as an Emerald Crab).
#3 isn't reef safe, but could be a fun sump crab.
Yeah, it may be a Xanthid or Pilumnid crab, both of which would be called Gorilla crabs by most reefers.I think #3 is a Gorilla Crab? I had one come in on my TBS rock as a tiny baby and had no clue until I saw it devouring my mushroom coral.
Technically no because the hairy legs alone don’t make it a gorilla crab. Colloquially, you could almost make that argument, but they have the wrong kind/shape of claws for it.
Technically, the term gorilla crab pretty well only applies to crabs from the taxonomic family Xanthidae (emerald crabs are from the same taxonomic subsection - Heterotremata - but a different superfamily and - thus by default - a different family, Mithracidae).
Colloquially, however, the term is applied to pretty much any hairy crab with scissor-shaped claws (emerald crabs have more spoon-shaped claws), and, in the hobby, the term is basically used to mean any crab (regardless of claw shape or if it’s hairy or not) that isn’t reef-safe/would be likely to attack other inhabitants of the tank.