Carribean crab (Side view.).

Coenobita Clypeatus, often known as the purple pincher crab, the soldier crab, or the Carribean crab, are one of the most common species of hermit crabs found in the U.S of A. They usually are a tan or light brown colour with-You guessed it- a purple defence pincher (The larger of their two pinchers.) or sometimes a purple-blue-ish colour. While they mostly will have purple, orange, yellow or brown markings, their diet can often affect the colour of their exoskeleton often resulting in a dark red or light-almost white-brown.