GEORGETTE DOUWMA / Porcelain crab {Neopetrolisthes maculatus} on anemone. Milne Bay, Papua New Guinea

GEORGETTE DOUWMA / Porcelain crab {Neopetrolisthes maculatus} on sea anemone. Milne Bay, Papua New Guinea

GEORGETTE DOUWMA / Banded prawn goby pair {Cryptocentrus cinctus} with blind Alpeid shrimp at entrance to burrow. Shrimps maintain the burrow while Gobies act as lookout.

GEORGETTE DOUWMA / Banded prawn goby fish pair {Cryptocentrus cinctus} with alpeid shrimps, Borneo. Gobies live in burrow with blind prawn. Prawns maintain the burrow while Gobies act as lookout.

Constantinos Petrinos / Mantis shrimp carrying eggs {Odontodactylus scyllarus} Sulawesi, Indonesia

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

Peter Scoones / Krill {Euphasia sp} Antarctica

GEORGETTE DOUWMA / Fiddler crab {Uca sp} female Bunaken, Sulawesi, Indonesia

Constantinos Petrinos / Harlequin shrimp {Hymenocera elegans} feeding on starfish {Linckia laevigata} Philippines

Constantinos Petrinos / Chromodorid nudibranch {Ceratosoma tenue} laying egg mass + commensal Imperial shrimp {Periclimenes imperator / Zenopontonia rex} Lembeh straits, Sulawesi, Indonesia

Constantinos Petrinos / Dorid nudibranch {Risbecia tryoni} with pair of commensal Imperial shrimps {Periclimenes imperator / Zenopontonia rex} Lembeh straits, Sulawesi, Indonesia

Robin Chittenden / Slavonian Grebe (Podiceps auritus) eating a crustacean, Oulton Broad, Suffolk, UK, October

Hiroya Minakuchi / Gray Whale (Eschrichtius robustus) head with barnacles, San Ignacio Lagoon, Baja California, Mexico

Sebastian Kennerknecht / Barnacles covering rock, Cape Cod, Massachusetts

Flip Nicklin / Antarctic Krill (Euphausia superba) a small shrimp-like crustacean is the most important zooplankton in the Antarctic food web, Antarctica

Flip Nicklin / Antarctic Krill (Euphausia superba) a small shrimp-like crustacean is the most important zooplankton in the food web, Antarctica

Flip Nicklin / Antarctic Krill (Euphausia superba) a small shrimp-like crustacean is the most important zooplankton in the Antarctic food web, Antarctica

Phil Chapman / White cave crab {Crustacea} Mulu caves, Sarawak, Indonesia Janibusan cave

Martha Holmes / Common barnacles on rock {Balanus balanoides} Britain

Constantinos Petrinos / Soft coral spider crab {Hoplophrys oatesii} on soft coral {Dendronephthya sp}