Georgette Douwma / Emperor shrimp (Periclemenes imperator) on a Sea Cucumber. West Papua, Indonesia. Indo-West Pacific.

David Fleetham / Imperial commensal shrimp (Periclimenes imperator / Zenopontonia rex) on Spanish dancer nudibranch (Hexabranchus sanguineus) at night. Philippines.

David Fleetham / Commensal / Periclimenes shrimp (Periclemenes soror), difficult to spot on surface of Large pincushion starfish (Culcita novaeguineae). Hawaii.

David Fleetham / Emperor shrimp (Periclemenes imperator) on a leopard sea cucumber (Bohadschia argus), Indonesia.

David Fleetham / Reticulated brittle star (Ophiocoma brevipes), and commensal shrimp (Periclemenes soror) on a cushion starfish (Culcita novaeguineae), Hawaii.

Franco Banfi / Emperor shrimp (Periclemenes imperator) on sea cucumber (Thelenota ananas) Tubbataha Reef Natural Park, UNESCO World Heritage Site, Sulu Sea, Cagayancillo, Palawan, Philippines

Franco Banfi / Emperor shrimp (Periclemenes imperator) on sea cucumber (Thelenota ananas) Tubbataha Reef Natural Park, UNESCO World Heritage Site, Sulu Sea, Cagayancillo, Palawan, Philippines

Franco Banfi / Emperor shrimp (Periclemenes imperator) on sea cucumber (Thelenota ananas) Tubbataha Reef Natural Park, UNESCO World Heritage Site, Sulu Sea, Cagayancillo, Palawan, Philippines

Franco Banfi / Emperor shrimp (Periclemenes imperator) on sea cucumber (Thelenota ananas) Tubbataha Reef Natural Park, UNESCO World Heritage Site, Sulu Sea, Cagayancillo, Palawan, Philippines

Franco Banfi / Emperor shrimp (Periclemenes imperator) on sea cucumber (Thelenota ananas) Tubbataha Reef Natural Park, UNESCO World Heritage Site, Sulu Sea, Cagayancillo, Palawan, Philippines

Franco Banfi / Emperor shrimp (Periclemenes imperator) on Sea cucumber (Thelenota ananas), Tubbataha Natural Park, UNESCO Natural World Heritage Site, Sulu Sea, Cagayancillo, Palawan, Philippines. April.

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