The spiny squat lobster is easily recognized by its red shell marbled with blue and its long spiny claws; when disturbed, it darts backward with a quick flick of its tail to escape.
What defines this group — Crustaceans
Armoured arthropods: crabs, shrimp and lobsters, all built around an external shell.
The skeleton is on the outside; growing means shedding it — the moult.
Jointed legs in pairs, often reshaped into claws or antennae.
The larvae drift with the plankton in open water before settling on the bottom.