Georgette Douwma / Crinoid (Crinoidea) on Soft coral (Alcyonacea). Derawan Islands, East Kalimantan, Indonesia.

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

Georgette Douwma / Featherstar on seafan, Sulawesi, Indonesia.

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

Franco Banfi / Crinoid or feather star (Antedon mediterranea) on Violescent sea whip or Red sea fan (Paramuricea clavata) Punta Campanella Marine Protected Area, Amalfi Coast, Italy, Tyrrhenian Sea, Mediterranean.

Magnus Lundgren / Wild Wonders of China / Drifting juvenile Feather star or Crinoid, (Comatulida) Green Island, Taiwan. The island is a small volcanic island in the Pacific Ocean famous for clear water, coral reefs and marine life in abundanc...

Magnus Lundgren / Wild Wonders of China / Swimming juvenile Feather star (Comatulida) Green Island, Taiwan.

Alex Mustard / In-camera double exposure of Bennett's feather star (Oxycomanthus bennetti) growing in shallow water beneath trees, with sunburst. The Passage between Waigeo Island and Gam Island, Raja Ampat, Wes...

Sirachai Arunrugstichai / Close up details of the arms of white Feather star (Crinoidea), Lembeh Strait, North Sulawesi, Indonesia.

Jurgen Freund / Barrel sponge and Crinoids in coral reef, taken with fisheye lens. Indonesia.

Jurgen Freund / Soft coral (Alcyonacea) and Crinoids on poles of jetty acting as an artificial reef, many Glassy sweeper (Pempheris schomburgkii) fish in background. Misool Eco Resort, Raja Ampat Islands, Indonesia....

Sergio Hanquet / Atlantic feather star (Antedon bifida) Tenerife, Canary Islands.

Nick Hawkins / A crinoid, also known as a feather star on hard coral in Raja Ampat, West Papua, Indonesia, Pacific Ocean.

John Cancalosi / Fossil Crinoid (Jimbacrinus bostocki) from the Early Permian period, Gascoyne Junction, Western Australia

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