Commensal Periclimenaeus storchi shrimp inside tunicate

Commensal Periclimenaeus storchi shrimp inside tunicate, originally uploaded by echeng.

This bright green Periclimenaeus storchi shrimp lives inside a large Didemnum molle tunicate. I can't find it any of the critter ID books I own, so maybe someone out there can help me get an ID. We did a night dive in Alor, and many of the Didemnum molle tunicates contained critters living inside of them (I saw 2 different shrimps and an amphipod). All of the critters fled from lights, and getting this picture took over half an hour of careful planning and execution. Photo by Eric Cheng, taken with Canon 7D, 100mm macro lens, Nauticam underwater housing, Light & Motion Sola 600 focus light, 2 x Ikelite DS-125 strobes.

**Update:** this shrimp [has been identified]( as a *Periclimenaeus storchi*. It isn't a true snapping shrimp.

More info on this shrimp: - -