Franco Banfi / Crinoids (Oxycomanthus bennetti) Menjangan Island, Bali Island, Indonesia, Pacific Ocean

Georgette Douwma / Crinoid (Crinoidea) on artificial reef. Mabul, Malaysia.

Georgette Douwma / Crinoid (Crinoidea) on artificial reef. Mabul, Malaysia.

Richard Robinson / Featherstar (Crinoidea) on red coral (Errina novazelandiae) in Doubtful Sound, Fiordland National Park, New Zealand.

David Shale / Deepsea Featherstar (Crinoidea) on Primnoid coral seafan from a coral seamount in the Indian Ocean, December 2011

Jurgen Freund / Featherstars / crinoids attached to Gorgonian coral, West New Britain, Papua New Guinea.

Jurgen Freund / Feather star (Crinoidea) underside. Misool, Raja Ampat, West Papua, Indonesia.

Jurgen Freund / Feather star (Crinoidea) underside. Misool, Raja Ampat, West Papua, Indonesia

David Fleetham / Crinoid shrimp (Periclimenes amboinensis) on matching Feather star (Comanthus bennetti) Philippines.

Georgette Douwma / Featherstar (Crinoidea) on coral with shoal of Surgeonfish swimming in the background, Moto Mount, Indonesia

Georgette Douwma / Squat lobster (Allogalathea elegans) on featherstar, Solomon Islands. Did you know? There are over 900 species of Squat lobster in the world - most of which live around hydrothermal vents.

Georgette Douwma / Featherstar {Crinoidea} on Gorgonian coral. Indonesia

Jurgen Freund / Feather star {Crinoidea} on fan coral, Indo Pacific

Jurgen Freund / Featherstar in fan coral {Crinoidea} Indo-Pacific

Carine Schrurs / Coral reef scenic with Barrel sponges {Xestospongia testudinaria}, Crinoids {Crinoidea}, Anthias fish Batangas, Philippines. Indo-Pacific

Jurgen Freund / Featherstar {Crinoidea} on fan coral, Sulu-sulawesi seas, Indo Pacific

DAVID HALL / Featherstar on red seafan {Crinoidea}, Solomon Islands

Georgette Douwma / Featherstar on seafan, Sulawesi, Indonesia.

Jeff Rotman / Crinoid holds onto fire coral while feeding at night. Red Sea

Shane Gross / Colorful coral reef scene with feather stars (crinoids), magenta slender anthias (Luzonichthys waitei) and a School of Bigeye jacks / trevally (Caranx sexfasciatus), Kimbe Bay, Papua New Guinea.

Shane Gross / A scuba diver with light looks at a beautiful coral reef with feather stars (crinoid) and red whip corals / sea whips (Ellisella sp) in Kimbe Bay, Papua New Guinea.

Georgette Douwma / Kaleidoscopic image of a featherstar. Indonesia.

Georgette Douwma / Kaleidoscopic image of a featherstar. Indonesia.

Georgette Douwma / Kaleidoscopic image of a featherstar. Indonesia.

Georgette Douwma / Kaleidoscopic image of detail of crinoid. West Papua, Indonesia.

Georgette Douwma / Kaleidoscopic image of crinoid or feather star on gorgonian. Indonesia.

Georgette Douwma / Kaleidoscopic image of crinoids or feather stars. Indonesia.

Magnus Lundgren / Wild Wonders of China / Free swimming feather star or crinoid (Crinoidea) Xiaoliuqiu Island, Taiwan

SCOTLAND: The Big Picture / Feather star shrimp (Hippolyte prideauxiana) on a feather star (Antedon bifida) Scotland, UK, February.

Georgette Douwma / Kaleidoscopic image of Feather stars (Crinoidea) and Gorgonian wrapper anemone.(Nemanthus annamensis). Indonesia. Western Pacific.

Alex Mustard / Giant / Commerson's frogfish (Antennarius commersoni) waiting to ambush prey. Amongst Crinoids and Sponges on coral reef. Nusa Kode, Rinca Island, Komodo National Park, Indonesia. South East Asia. Hor...

Graham Eaton / Carbonifeous (Dinantian) Crinoidal Limestone, Halkyn, Wales. This limestone is wholly made up of fragments of fossil Crinoids.Crinoids are similar to Sea Lillys

Graham Eaton / Carbonifeous (Dinantian) Crinoidal Limestone, with camera lens cap for scale, Halkyn, Wales. This limestone is wholly made up of fragments of fossil Crinoids.

Richard Robinson / Crinoidea (Feather Star) in a Gorgonian Fan (Gorgonacea) at Ogea Levu, Lau Island Group, Fiji.

Richard Robinson / Feather Star (Crinoidea) at Vatoa Island also known as Turtle Island by Captain Cook, Lau Island Group, Fiji.

Linda Pitkin / Feather star (crinoid) Triton Bay, near Kaimana, West Papua, Indonesia

Linda Pitkin / Feather star (crinoid) on Sea fan (Gorgonian coral), Triton Bay, near Kaimana, West Papua, Indonesia

Bert Willaert / Giant barrel sponge (Xestospongia testudinaria) with feather stars (Crinoids). Bismarck Sea, Vitu Islands, West New Britain, Papua New Guinea

Bert Willaert / Feather stars (Crinoids) on Barrel sponge (Xestospongia testudinaria) and soft corals. Bismarck Sea - Vitu Islands, West New Britain, Papua New Guinea

Franco Banfi / Crinoid or feather star on the reef, Tubbataha Reef Natural Park, UNESCO World Heritage Site, Sulu Sea, Cagayancillo, Palawan, Philippines

Franco Banfi / Crinoid or feather star on a sea whip, Tubbataha Reef Natural Park, UNESCO World Heritage Site, Sulu Sea, Cagayancillo, Palawan, Philippines

Georgette Douwma / RF - Featherstars / Crinoids on Gorgonian, West Papua, Indonesia. (This image may be licensed either as rights managed or royalty free.)

Jack Dykinga / Fossil crinoids in limestone, Grand Canyon-Parashant National Monument Arizona, USA.

Linda Pitkin / Sea fan with Feather stars on coral reef. Batu Rufus, Penemu, Raja Ampat, West Papua, Indonesia.

David Fleetham / Alconarian coral, starfish, crinoids and a feather dust worm all compete for space in this Indonesian reef scene off Rinca Island, Komodo National Park, Indonesia.

Georgette Douwma / RF - Crinoid or featherstar on coral reef, Malapascua Island, Philippines. (This image may be licensed either as rights managed or royalty free.)

Georgette Douwma / RF - Crinoid or featherstar on coral reef, Malapascua Island, Philippines. (This image may be licensed either as rights managed or royalty free.)

Georgette Douwma / RF- Gorgonians and crinoids on coral reef. Indonesia. (This image may be licensed either as rights managed or royalty free.)