Linda Pitkin / Emperor shrimp (Periclimenes imperator / Zenopontonia rex), commensal with Amberfish Sea cucumber (Thelenota anax) Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Sea cucumbers {Thelonota anax} on sandy sea floor. Great Barrier Reef, Queensland, Australia

Juergen Freund / Various sea cucumbers including (Thelonota anax) on sandy sea floor. Sea cucumber in foreground, Great Barrier Reef, Queensland, Australia

Juergen Freund / Sea cucumbers {Thelonota anax} on sandy sea floor. Great Barrier Reef, Queensland, Australia

Georgette Douwma / Sea cucumber (Thelenota anax) defecating. The most massive holothurian in the Indo-Pacific, reaching 1 meter in length. Andaman Sea, Thailand.

Juergen Freund / Anal hole of Sea cucumber (Thelenota anax) Sipadan, Malaysia.

GEORGETTE DOUWMA / Sea cucumber (Thelenota anax) Papua New Guinea

GEORGETTE DOUWMA / Anax sea cucumber (Thelenota anax) on seabed, Andaman Sea, Thailand

Juergen Freund / Diver with Giant sea cucumber {Thelenota anax} Sulawesi, Indonesia, Indo-pacific

GEORGETTE DOUWMA / Sea cucumber {Thelenota anax} + sea slug{Chelidonura varians} Borneo, Indonesia