Birgitte Wilms / Emperor Shrimp (Periclimenes imperator / Zenopontonia rex) on Sea Cucumber (Synapta maculata) 20 feet deep, Papua New Guinea

Juergen Freund / Emperor cleaner shrimp {Periclimenes imperator / Zenopontonia rex} on sea cucumber. Indo Pacific

Constantinos Petrinos / Emperor shrimp pair on sea cucumber, Sulawesi, Indonesia

Georgette Douwma / Emperor shrimp {Periclimenes imperator / Zenopontonia rex} on sea cucumber, Papua New Guinea

Doug Perrine / Two Emperor shrimps {Periclimenes imperator / Zenopontonia rex} on gills of Spanish dancer nudibranch, Great Barrier Reef, Australia (Non-ex).

Juergen Freund / Emperor shrimp camouflaged on sea cucumberr, Indo-Pacific

Constantinos Petrinos / Emperor shrimp {Periclimenes imperator / Zenopontonia rex} and tiny harlequin crab {Lissocarcinus orbicularis} on sea cucumber {Bohadschia argus} Sulawesi Indonesia

Roberto Rinaldi / Emperor shrimp (Periclimenes imperator / Zenopontonia rex) hiding in gills of Spanish dancer nudibrach (Hexabranchus sanguineus), La Runion, Indian Ocean.

Roberto Rinaldi / Emperor shrimp (Periclimenes imperator / Zenopontonia rex) hiding among the feathery gills of a spanish dancer nudibranch / sea slug (Hexabranchus sanguineus), La Runion, Indian Ocean

Juergen Freund / Emperor shrimp {Periclimenes imperator / Zenopontonia rex} on Sea cucumber, Indo pacific

David Hall / Emperor shrimp {Periclimenes imperator / Zenopontonia rex} on Spanish dancer nudibranch, Indo pacific

Birgitte Wilms / Emperor Shrimp (Periclimenes imperator / Zenopontonia rex) on Spanish Dancer (Hexabranchus sanguineus) nudibranch, Red Sea, Egypt