Georgette Douwma / Lampert's sea cucumber (Synaptia lamperti) group feeding, North Sulawesi, Indonesia.

Fred Bavendam / Sea Cucumber (Synaptula media) group on sponge, Manado, Sulawesi, Indonesia

Chris Newbert / Emperor Shrimp (Periclimenes imperator / Zenopontonia rex) on Sea Cucumber (Euapta sp), Papua New Guinea

Birgitte Wilms / Emperor Shrimp (Periclimenes imperator / Zenopontonia rex) on Sea Cucumber (Synapta maculata) 20 feet deep, Papua New Guinea

Pete Oxford / Sea Cucumber (Synaptula lamperti) group on Giant Barrel Sponge (Xestospongia sp), Raja Ampat Islands, Indonesia

Pete Oxford / Sea Cucumber (Synaptula lamperti) group on coral, Raja Ampat Islands, Indonesia

Pete Oxford / Sea Cucumber (Synaptula lamperti) group on coral, Raja Ampat Islands, Indonesia

Roberto Rinaldi / Elephant ear sponge (Lanthella sp) covered with worm like creatures that are synaptid sea cucumbers (Synaptidae sp.), Australia.

Georgette Douwma / Composite image of echinoderms on black background. Species present: - Top row from left: Yellow sea cucumber (Colochirus robustus) and Lampert's sea cucumber (Synaptula lamperti), Black sea c...

David Fleetham / Yellow elephant ear sponge (Ianthella basta) with dark-coloured Whiteline sea cucumbers (Synaptula lamperti) and the paler, unnamed species, Philippines.

Sergio Hanquet / Beaded sea cucumber (Euapta lappa), nocturnal species, Tenerife, Canary Islands.