Sea Gooseberry, Pleurobranchia pileus, predating on Northern Krill, Meganyctiphanes norvegica, Sotra, Hordaland, Norway, North Atlantic Ocean.

Sea Gooseberry, Pleurobranchia pileus, predating on Northern Krill, Meganyctiphanes norvegica, Sotra, Hordaland, Norway, North Atlantic Ocean.

Sea Gooseberry, Pleurobranchia pileus, predating on Northern Krill, Meganyctiphanes norvegica, Sotra, Hordaland, Norway, North Atlantic Ocean.

Hermit Crab, Calcinus tubularis, and red sponge, El Hierro, Canary Islands, Spain, Atlantic Ocean

Hermit Crab, Calcinus tubularis, and red sponge, El Hierro, Canary Islands, Spain, Atlantic Ocean

Unidentified shrimp on whipcoral, Angra, Rio de Janeiro, Brazil.

Unidentified shrimp on whipcoral, Angra, Rio de Janeiro, Brazil.

Female fiddler crab, Uca tetragonon, Loloata island, Port Moresby, Natiaonal Capital District Province, Papua New Guinea.

Male fiddler crab, Uca tetragonon, Loloata island, Port Moresby, Natiaonal Capital District Province, Papua New Guinea.

Hyperid amphipod, Hyperiidea sp., on Jellyfish, Pelagia sp., Supsom, Seogwipo, Jeju-do, Cheju Island, South Korea.

Hyperid amphipod, Hyperiidea sp., on Jellyfish, Pelagia sp., Supsom, Seogwipo, Jeju-do, Cheju Island, South Korea.

Squat lobster, Galathea sp, and Sea lilly, Antedon petasus, Gulen, Sogn og fjordane, Norway.

Norway lobster, Nephrops norwegicus, Sea penn, Virgularia mirabilis, Sørfjorden, Bergen, Hordaland, Norway.

Norway lobster, Nephrops norwegicus, Sea penn, Virgularia mirabilis, Sørfjorden, Bergen, Hordaland, Norway.

Norway lobster, Nephrops norwegicus, Sea penn, Virgularia mirabilis, Sørfjorden, Bergen, Hordaland, Norway.

Sea gooseberry (Pleurobrachia pileus) and parasitic hyperid amphipod, Hyperia galba, Hafrsfjord, Stavanger, Rogaland, Norway.

Hairy hermit crab, Pagurus pubescens, with commensal hydriod, Hydractinia echinata, Stokmarknes, Hadsel, Nordland, Norway.

Tiger amphipod, Iphimedia obesa, on Kelp, Laminaria hyperborea, Stokmarknes, Hadsel, Nordland, Norway.

Tiger amphipod, Iphimedia obesa, on Kelp, Laminaria hyperborea, Stokmarknes, Hadsel, Nordland, Norway.

Unidentified hyperid amphipod, Hyperidae, on Korsmanet, Staurophora mertensi, Stokmarknes, Hadsel, Nordland, Norway.

Unidentified hyperid amphipod, Hyperidae, on Korsmanet, Staurophora mertensi, Stokmarknes, Hadsel, Nordland, Norway.

Tiger amphipod, Iphimedia obesa, on Kelp, Laminaria hyperborea, Stokmarknes, Hadsel, Nordland, Norway.

Tiger amphipod, Iphimedia obesa, on Kelp, Laminaria hyperborea, Stokmarknes, Hadsel, Nordland, Norway.

Chameleon shrimp with eggs, Hippolyte varians,on Kelp, Laminaria hyperborea, Stokmarknes, Hadsel, Nordland, Norway.

Tiger amphipod, Iphimedia obesa, on Kelp, Laminaria hyperborea, Stokmarknes, Hadsel, Nordland, Norway, North Atlantic Ocean.

Norway redfish, Sebastes viviparus, with parasitic icopepod, Takvam, Sørfjorden, Bergen, Norway.

Copepod, Calanus sp, with unknown type of parasite, Sørfjorden, Takvam, Bergen, Hordaland, Norway.

Copepod, Calanus sp, with unknown type of parasite, Sørfjorden, Takvam, Bergen, Hordaland, Norway.

Hyperid amphipod, Hyperia galba, on Moon jellyfish, Aurelia aurita, Endo parasite, Sørfjorden, Takvam, Bergen, Hordaland, Norway.

Hairy hermit crab, Pagurus pubescens, with commensal hydriod, Hydractinia echinata, Stokmarknes, Hadsel, Nordland, Norway.

Box crabs, Shame-faced crabs, Calappa sp., Puerto Mogan, Gran Canaria, Canary Islands, Spain.

Upogebia stellata, Bergen, Hordaland, Norway.

Upogebia stellata, Bergen, Hordaland, Norway.

Krill, Euphausiacea ssp, Vaksdal, Hordaland, Norway.

Krill, Euphausiacea ssp, Vaksdal, Hordaland, Norway.

Chameleon prawn, Hippolyte varians, on Ciona intestinalis, Øygarden, Hordaland, Norway.

Polar lebbeid , Lebbeus polaris, Vestvågøy, Nordland, Norway.

Hairy British squat Lobster, Galathea nexa, moulting, Vågan, Nordland, Norway.

Hairy British squat Lobster, Galathea nexa, moulting, Vågan, Nordland, Norway.

Parasitic Hyperid amphipod, Hyperia sp, on lobed comb jelly, Bolinopsis infundibulum, Takvam, Sørfjorden, Bergen, Norway.

Cameleon shrimp, Hippolyte varians on a carpet of, Botryllus schlosseri, colonies, Bergen, Hordaland, Norway, North Atlantic Ocean

Portrait of Chameleon shrimp, Hippolyte varians, Gulen, Sogn og Fjordane, Norway, North Atlantic Ocean

Eye detail of Shrimp, Pandalus montagui, Bergen, Hordaland, Norway, North Atlantic Ocean

Eye detail of Shrimp, Pandalus montagui, Bergen, Hordaland, Norway, North Atlantic Ocean

Squat lobster, Galathea strigosa, Øygarden, Hordaland, Norway, North Atlantic Ocean

Lyre Crab, Hyas coarctatus, on Sea urchin detail, Echinus esculentus, Øygarden, Hordaland, Norway.

Commensal shrimp, Spirontocaris spinus, on Gorgonian, Paramuricea placomus, Trondheims fjord, Trondheim, Sør Trøndelag, Norway.

Commensal shrimp, Spirontocaris spinus, on Gorgonian, Paramuricea placomus, Trondheims fjord, Trondheim, Sør Trøndelag, Norway.