1) Arthropod family 2) Family majidae 3) Spider crabs 
Majidae is a family of crabs, comprising around 200 marine species with a carapace that is longer than it is broad, and which forms a point at the front. The legs can be very long in some species, leading to the name `spider crab`. The exoskeleton is covered with bristles to which the crab attaches algae and other items to act as camouflage. ==G.....
[n] - spider crabs
family Majidae noun spider crabs