Emperor shrimp

Zenopontonia rex

The emperor shrimp is a species of shrimp with a wide distribution across the Indo-Pacific. It lives commensally on a number of hosts, including the sea slug ''Hexabranchus''. A. J. Bruce first described it in 1967 based on eight specimens ranging from 4 millimetres to 7.6 millimetres , and found ''Periclimenes rex'' to be its best resemblance.