Alex Mustard / Reef lizardifsh (Synodus variegatus) at a cleaning station, being cleaned by Holthuis anemone shrimps (Ancylomenes holthuisi). Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.

Alex Mustard,Alex Mustard / A portrait of a small Candy stripe shrimp (Lebbeus grandimanus) in front of its host pink anemone (out of focus because of the magnification). Browning Wall, Browning Pass, Port Hardy, Vancouver Islan...

Jeff Rotman / Symbiotic shrimp on basal disc of sea anemone, Red Sea

Sergio Hanquet / Red-backed cleaner shrimp (Lysmata grabhami) head, close up. Tenerife, Canary Islands.

Alex Mustard / Bluestreak cleaner wrasse (Labroides dimidiatus) attends to a Clark's anemonefish (Amphiprion clarkii) at a cleaning station on a coral reef. It is unusual to see an anemonefish at a cleaning stat...

David Fleetham / Anemone shrimp (Thor amboinensis) on Giant sea anemone (Condylactis gigantea), Bonaire, the Netherlands Antilles, Caribbean.

David Fleetham / Spotted cleaner shrimp (Periclimenes yucatanicus) on its host anemone, Bonaire, Caribbean.

Franco Banfi / Two Ambonian / Squat shrimps (Thor amboinensis) on coral, Lighthouse Reef, Cabilao Island, Bohol, Central Visayas, Philippines, Pacific Ocean.

Franco Banfi / Two Mushroom coral / Commensal shrimps (Cuapetes / Periclimenes kororensis) on Mushroom coral (Heliofungia actiniformis) Lighthouse Reef, Cabilao Island, Bohol, Central Visayas, Philippines, Pacific O...

Franco Banfi / Two Commensal shrimps (Periclimenes tosaensis) in Sea anemone (Heteractis magnifica) Lighthouse Reef, Cabilao Island, Bohol, Central Visayas, Philippines, Pacific Ocean.

Tony Wu / Giant moray eel (Gymnothorax javanicus) being cleaned by Scarlet cleaner shrimp (Lysmata amboinensis) Ambon, Indonesia

Pascal Kobeh / Peacock-tail anemone shrimps (Periclimenes brevicarpalis) pair living in Adhesive sea anemone (Cryptodendrum adhesivum) Sulu Sea, Philippines

Georgette Douwma / Snake sea anemone or Haeckels anemone (Actinostephanus haeckeli) with Magnificent shrimps (Periclemens magnifica) Lembeh, Sulawesi, Indonesia.

Georgette Douwma / Snake sea anemone or Haeckels anemone (Actinostephanus haeckeli) with Magnificent shrimps (Ancylomenes magnificus) Lembeh, Sulawesi, Indonesia.

Pascal Kobeh / Pink anemonefish (Amphiprion perideraion) in Magnificent sea anemone (Heteractis magnifica) with Holthuis commensal shrimps (Periclimenes holthuisi) Philippines. Sulu Sea.

Pascal Kobeh / Two Paron shrimps (Gelastocaris paronae) on a sponge, Manado, Indonesia. Sulawesi Sea.

Franco Banfi / Marble shrimp (Saron sp.) Raja Ampat, Irian Jaya, West Papua, Indonesia, Pacific Ocean

Michael Pitts / Anemone shrimp (Periclimenes brevicarpalis) Red Sea.

Franco Banfi / Commensal shrimp (Periclimenes brevicarpalis) Maldives, Indian Ocean

Sue Daly / Anemone prawn (Periclimenes sagittifer) Channel Islands, UK June

Todd Mintz / Candy stripe shrimp (Lebbeus grandimanus) amongst tentacles of Anemone, Browning Passage, Vancouver Island, British Columbia, Canada, September

Georgette Douwma / Anemone Shrimp (Thor amboinensis) in bleached anemone. Manado, North Sulawesi, Indonesia.

Sue Daly / Anemone Prawn (Periclimenes sagittifer). Channel Islands, UK, July.

Georgette Douwma / Anemone Shrimp (Periclimenes brevicarpalis). Komodo National Park, Indonesia.

Georgette Douwma / Anemone Shrimp (Periclimenes brevicarpalis). Komodo National Park, Indonesia.

Juergen Freund / Pacific clown anemone shrimp (Periclimenes brevicarpalis), a commensal shrimp found on sea anemones. Misool, Raja Ampat, West Papua, Indonesia.

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

Juergen Freund / Sexy anemone shrimp (Periclimenes longicarpus) on anemone, Lembeh Strait, North Sulawesi, Indonesia

Michele Westmorland / Pederson / Cleaner shrimp (Periclimenes pedersoni) in Corkscrew anemone (Bartholomea annulata) Dominica, West Indies, Caribbean.

Claudio Contreras / Spotted cleaner shrimp (Periclimenes yucatanicus) amongst tentacles of Giant anemone (Condylactis gigantea) Puerto Morelos National Park, Caribbean Sea, Mexico, January

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

GEORGETTE DOUWMA / Yellowfin goatfish (Mulloidichthys vanicolensis) lying on sand next to Cerianthid anemone where cleaner shrimps have set up cleaning station. Vava'u, Tonga, Indo-Pacific

Sue Daly / Anemone Prawn (Periclimenes sagittifer) in Snakelocks Anemone (Anemonia viridis), Jersey, Channel Islands, UK

Juergen Freund / Anemone shrimp {Periclimenes brevicarpalis} amongst tentacles of highly venomous anemone, Indo-Pacific

David Hall / Anemone shrimp amongst anemone corals. (Periclimines kororensis) Solomon Is, Pacific

Doug Perrine / Spotted cleaner shrimp {Periclimenes yucatanicus} in Giant sea anemone {Condylactis gigantea} Dominica, Caribbean

GEORGETTE DOUWMA / Black-spotted porcupinefish {Arothron hystrix} lying next to Ceranthid anemone where shrimps have set up a cleaning station. Lembeh Strait, North Sulawesi, Indonesia.

GEORGETTE DOUWMA / Yellowstripe goatfish {Mulloidichthys flavolineatus} lying next to Cerianthid anemone, waiting to be cleaned by the Shrimps on the base of the anemone. Tonga, Indo-Pacific.

Constantinos Petrinos / Squat anemone shrimp {Thor amboinensis} Sulawesi, Indonesia

Doug Perrine / Spotted cleaner shrimp in symbiotic relationship with anemone {Periclimenes yucatanicus} Bonaire, Caribbean (Non-ex).

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

Sue Daly / Anemone prawn {Periclimenes sagittifer} amongst anemone tentacles Jersey, Channel Isles, UK

Michael Pitts / Anemone shrimp (Periclemenes brevicarpalis). Hoi Hawan, Hongkong, China

Fabio Liverani / Anemone shrimp, Sipadan, Malaysia

David Fleetham / Clown / Candy stripe shrimp (Lebbius grandimanus) on Rose / Crimson anemone (Cribrinopsis fernaldi) with eggs visible in the transparent tips of its tentacles, British Columbia, Canada.

David Fleetham / Two commensal shrimp (Periclimenes venustus) on Beaded sea anemone (Heteractis aurora), Mabul Island, Malaysia.

David Fleetham / Commensal shrimp (Thor amboinensis) on hard coral polyps (Euphyllia ancora), Mabul Island, Malaysia.

David Fleetham / Clown shrimp (Lebbeus grandimanus) on Crimson / Rose anemone (Cribrinopsis fernaldi), British Columbia, Canada.

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

Juergen Freund / Anemone shrimp {Periclimenes brevicarpalis} with colouring for camouflage in anemone, Indo Pacific

Juergen Freund / Anemone shrimp {Thor amboinensis} on bubble coral, Indo pacific

David Hall / Crimson anemone (Cribrinopsis fernaldi) with Candy-striped shrimps (Lebbeus grandimanus) living symbiotically. Browning Pass, Queen Charlotte Strait, British Columbia, Canada. September.

David Hall / White-spotted rose anemone (Urticina lofotensis) and Kincaid's shrimps (Heptacarpus kincaidi) living commensally, Kyen Point, Alma Russel Islands, Barkley Sound, British Columbia, Canada. Septembe...