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The rectum is the home!
This is a Pentagonal Urchin Shrimp - Echinoecus pentagonus, very difficult to find and even more difficult to take proper picture of, for several reasons :
1. It lives inside the rectum of the Sea Urchin, thus you have to flip the Sea Urchin to find them. They are rarely seen outside.
2. As its host is a Sea Urchin and will keep moving if you flips them, you have to be careful not to get your hand/fingers stung by the Sea Urchins.
According to Wikipedia, this Crab is a parasite.
The "sea urchin crab" ''Echinoecus pentagonus'' is a species of crab in the family Pilumnidae found from the Red Sea and East Africa to French Polynesia and the Hawaiian Islands. This crab is a parasite that lives in the rectum of a sea urchin. In Hawaii, it chooses only ''Echinothrix calamaris'', leaving few of these urchins unpopulated. Its curved and pointed carapace reaches only 0.5 inches in width.
Taxonomic synonyms of ''E. pentagonus'' include:
*''Echinoecus klunzingeri''.. more
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