David Fleetham / Sea cucumber (Holothuria pervicax) at night with Red boring sponge (Hamigera sp) in foreground. Hawaii.

David Fleetham / Tiny brittle star (Ophiothrix sp) crawling across Sea cucumber, (Bohadschia argus) Yap, Micronesia.

David Fleetham / Sea cucumber (Bohadschia argus) which has ejected a part of its internal organs called Cuvierian tubules. These significantly sticky strings are a defense mechanism designed to deter predators. Yap,...

David Fleetham / Necklace seastar (Fromia monilis) on Sea cucumber (Bohadaschia argus) Yap, Micronesia.

Constantinos Petrinos / Emperor shrimp (Periclimenes imperator / Zenopontonia rex) with parasitic Isopod (Bopyridae) and living commensally with Leopard Sea Cucumber (Bohadschia argus) Lembeh Strait, North Sulawesi, Indonesi...

Georgette Douwma / Eyed sea cucumber (Bohadschia argus) on sandy reef slope. Similan Islands, Andaman Sea, Thailand.

Georgette Douwma / Black sea cucumber (Holothuria atra) rearing up and releasing eggs and sperm. Andaman Sea, Thailand.

Georgette Douwma / Black sea cucumber (Holothuria atra) rearing up and releasing sperm. Andaman Sea, Thailand.

Georgette Douwma / Leopard sea cucumber (Bohadschia argus) Lembeh, Sulawesi, Indonesia.

Georgette Douwma / Leopard sea cucumber (Bohadschia argus) Lembeh, Sulawesi, Indonesia.

Juergen Freund / Dried Sea cucumbers (Holothuria) Yadua Island, Bua Province, Fiji, South Pacific. August 2013