Gary Bell/ Oceanwide / Nudibranch (Ceratosoma sp) with commensal Emperor Shrimp (Periclimenes imperator), Philippines

Gary Bell/ Oceanwide / Nudibranch (Ceratosoma sp) with commensal Emperor Shrimp (Periclimenes imperator), Philippines

Gary Bell/ Oceanwide / Tyron's Risbecia (Risbecia tryoni) with commensal Emperor Shrimp (Periclimenes imperator), Milne Bay, Papua New Guinea

Gary Bell/ Oceanwide / Tyron's Risbecia (Risbecia tryoni) with commensal Emperor Shrimp (Periclimenes imperator), Milne Bay, Papua New Guinea

David Fleetham / Giant / Star pufferfish (Arothron stellatus) opening gills to allow the Commensal / Periclimenes shrimp, (Periclimenes sp) to go inside in search of parasites, Bali, Indonesia.

Georgette Douwma / Emperor shrimp (Periclemenes imperator) on a nudibranch (Ceratosoma sp.) Lembeh Strait, North Sulawesi, Indonesia.

Pascal Kobeh / Transparent commensal / Magnificent anemone shrimp (Periclimenes magnificus) on an Anemone tube (Cerianthus sp) Sulu Sea, Philippines

Pascal Kobeh / Female diver taking a picture of a shrimp (Periclimenes sp.) living in a sea pen (Pteroeides sp.) Philippines, Sulawesi Sea.

Norbert Wu / Coleman's Shrimp (Periclimenes colemani) male and female hiding among spines of venomous Fire Urchin (Asthenosoma varium), Ambon, Indonesia

Jeff Rotman / Symbiotic commensal Emperor shrimp (Periclimenes imperator / Zenopontonia rex) living inside the gills of a Spanish dancer nudibranch (Hexabranchus sp), Red Sea, Egypt

Pete Oxford / Spotted Cleaner Shrimp (Periclimenes yucatanicus) on Giant Caribbean Anemone (Condylactis gigantea), Bonaire, Netherlands Antilles, Caribbean

Birgitte Wilms / Shrimp (Periclimenes sp) on Bulb Tentacle Sea Anemone (Entacmaea quadricolor) tentacles, Solomon Islands

Birgitte Wilms / Coleman's Shrimp (Periclimenes colemani) camouflaged on Fire Urchin (Asthenosoma varium), Indonesia

Birgitte Wilms / Shrimp (Periclimenes sp) in anemone tentacles, Papua New Guinea

Juergen Freund / Mushroom coral ghost shrimps / Anemone shrimps (Periclimenes kororensis), always found in association with mushroom corals (Heliofungia sp.) or sea anemones. Lembeh Strait, North Sulawesi, Indonesia

Luciano Candisani / Spotted Cleaner Shrimp (Periclimenes yucatanicus) on Giant Caribbean Anemone (Condylactis gigantea), Santa Barbara Island, Abrolhos Islands, Bahia, Brazil

Luciano Candisani / Spotted Cleaner Shrimp (Periclimenes yucatanicus) on Giant Caribbean Anemone (Condylactis gigantea), Santa Barbara Island, Abrolhos Islands, Bahia, Brazil

Luciano Candisani / Spotted Cleaner Shrimp (Periclimenes yucatanicus) on Giant Caribbean Anemone (Condylactis gigantea), Santa Barbara Island, Abrolhos Islands, Bahia, Brazil

Fred Bavendam / Appoloosa Shrimp (Periclimenes holthuisi) female carrying eggs on abdomen, Lembeh Strait, Indonesia

Chris Newbert / Coleman's Shrimp (Periclimenes colemani) on Fire Urchin (Asthenosoma varium), Indonesia

Chris Newbert / Coleman's Shrimp (Periclimenes colemani) and Adam's Urchin Crab (Zebrida adamsii) on Fire Urchin (Asthenosoma varium), Indonesia

Michele Westmorland / Small shrimp (Periclimenes sp) on anemone tentacles, House Reef at the Jetty, Tufi, Oro Province, Papua New Guinea

Chris Newbert / Emperor Shrimp (Periclimenes imperator / Zenopontonia rex) on Sea Cucumber (Euapta sp), Papua New Guinea

Scott Leslie / Spotted Cleaner Shrimp (Periclimenes yucatanicus) on anemone, Bonaire, Caribbean

Birgitte Wilms / Coleman's Shrimp (Periclimenes colemani) male and female on Fire Urchin (Asthenosoma varium) 90 feet deep, Indonesia

Chris Newbert / Emperor Shrimp (Periclimenes imperator / Zenopontonia rex) on Sea Star, 90 feet deep, Papua New Guinea

Chris Newbert / Ambon Shrimp (Periclimenes amboinensis) on Crinoid, 40 feet deep, Solomon Islands

Chris Newbert / Shrimp (Periclimenes sp) living among the gills of the Spanish Dancer (Hexabranchus sanguineus) nudibranch, 50 feet deep, Papua New Guinea

Chris Newbert / Shrimp (Periclimenes sp) living among the gills of the Spanish Dancer (Hexabranchus sanguineus) nudibranch, 50 feet deep, Papua New Guinea

Fred Bavendam / Ambon Shrimp (Periclimenes amboinensis) camouflaged against Feather Star Crinoid host, Bali, Indonesia

Norbert Wu / Shrimp (Periclimenes sp) live on surfaces of Starfish, Palau

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

Hiroya Minakuchi / Coleman's Shrimp (Periclimenes colemani) living among the venomous spines of a sea urchin, Sulu Sea, Borneo, Malaysia

Birgitte Wilms / Coleman's Shrimp (Periclimenes colemani) pair with shed carapace, Papua New Guinea

Fred Bavendam / Fire Urchin (Asthenosoma varium) that is host to a pair of Coleman's Shrimp (Periclimenes colemani) and parasitic Snails (Leutzenia asthenosomae), Bali, Indonesia

Fred Bavendam / Coleman's Shrimp (Periclimenes colemani) pair living among the spines of a Fire Urchin (Asthenosoma varium), Milne Bay, Papua New Guinea

Fred Bavendam / Coleman's Shrimp (Periclimenes colemani) pair living among the spines of a Fire Urchin (Asthenosoma varium), Milne Bay, Papua New Guinea

Fred Bavendam / Shrimp (Periclimenes sp) with similar coloration to that of its crinoid host, Milne Bay, Papua New Guinea

Fred Bavendam / Ambon Shrimp (Periclimenes amboinensis) with similar coloration to that of its host, Great Barrier Reef, Australia

Norbert Wu / Seastar Shrimp (Periclimenes soror) live on surfaces of Starfish, Sea of Cortez, Baja California, Mexico

Fred Bavendam / Ambon Shrimp (Periclimenes amboinensis) lives only on crinoids and adapts its coloration to match that of its host, Great Barrier Reef, Australia

Fred Bavendam / Coleman's Shrimp (Periclimenes colemani) pair living in venomous spines of a Fire Urchin (Asthenosoma varium), Bali, Indonesia

Fred Bavendam / Spotted Cleaner Shrimp (Periclimenes yucatanicus) on Sea Anemone, Bonaire

Doug Perrine / Cleaner shrimp {Periclimenes sp} on Giant anemone {Condylactis gigantea} Bahamas, Caribbean (Non-ex).

Gary Bell/ Oceanwide / Coleman's Shrimp (Periclimenes colemani) male and female on Fire Urchin (Asthenosoma varium), Great Barrier Reef, Australia

Gary Bell/ Oceanwide / Coleman's Shrimp (Periclimenes colemani) male and female on Fire Urchin (Asthenosoma varium), Great Barrier Reef, Australia

Gary Bell/ Oceanwide / Coleman's Shrimp (Periclimenes colemani) female on Fire Urchin (Asthenosoma varium), Great Barrier Reef, Australia

Gary Bell/ Oceanwide / Anemone Shrimp (Periclimenes brevicarpalis) on sea anemone tentacles, Lord Howe Island, New South Wales, Australia

Gary Bell/ Oceanwide / Ambon Shrimp (Periclimenes amboinensis) camouflaged on featherstar, Bali, Indonesia

Gary Bell/ Oceanwide / Emperor Shrimp (Periclimenes imperator) on sea cucumber, Great Barrier Reef, Australia

Pete Oxford / Seastar Shrimp (Periclimenes soror) group, Banda Sea, Indonesia

Norbert Wu / Coleman's Shrimp (Periclimenes colemani) male and female hiding among spines of venomous Fire Urchin (Asthenosoma varium), Ambon, Indonesia

Norbert Wu / Coleman's Shrimp (Periclimenes colemani) male and female hiding among spines of venomous Fire Urchin (Asthenosoma varium), Ambon, Indonesia

Norbert Wu / Coleman's Shrimp (Periclimenes colemani) male and female hiding among spines of venomous Fire Urchin (Asthenosoma varium), Ambon, Indonesia

Roberto Rinaldi / Commensal shrimp / Anemone shrimp (Pliopontonia sp) on a bubble coral (Plerogyra sp), Lankayan Island, Borneo

Norbert Wu / Coleman's Shrimp (Periclimenes colemani) hiding among venomous spines of Fire Urchin (Asthenosoma varium), Komodo, Indonesia

Norbert Wu / Coleman's Shrimp (Periclimenes colemani) hiding among venomous spines of Fire Urchin (Asthenosoma varium), Komodo, Indonesia

Juergen Freund / Cleaner shrimp {Periclimenes sp} transparent on coral, Philippines, Indo pacific

Juergen Freund / Cleaner shrimp {Periclimenes sp} completely transparent on coral, Philippines, Indo pacific

Juergen Freund / Cleaner shrimp {Periclimenes sp} on coral, Philippines, Indo pacific

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

Norbert Wu / Emperor Shrimp (Periclimenes imperator / Zenopontonia rex) live on surfaces of Sea Cucumber, Papua New Guinea

Juergen Freund / Crinoid shrimp {Periclimenes sp} on featherstar.commensal. Sulawesi, Indonesia

Juergen Freund / Cleaner shrimp on coral {Periclimenes sp} Philippines

Juergen Freund / Cleaner shrimp {Periclimenes sp} + Goby in tube sponge Cuba

Magnus Lundgren / Cleaning shrimp (Periclimenes sp,) on a coral reef, close up, Triton Bay, West Papua, Indonesia, Pacific Ocean.

Alex Mustard / Portrait of a large female Emperor shrimp (Zenopontonia rex/ Periclimenes imperator) on a sea cucumber (Bohadschia sp.). Dauin, Dauin Marine Protected Area, Dumaguete, Negros, Philippines. Bohol Sea,...