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.

Brandon Cole / Luxurious invertebrate growth on coral reef at 120 feet deep. Crinoids (Davidaster) mixed among many species of sponges and coral. Dominica, Caribbean Sea, January.

Jurgen Freund / Crinoids or featherstars covering a coral bommie with dive boat looming overhead, West New Britain, Papua New Guinea

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

Jurgen Freund / Gorgonian fan coral with crinoids / featherstars, Kimbe Bay, West New Britain, Papua New Guinea

Jurgen Freund / Giant barrel sponge (Xestospongia testudinaria) studded with crinoids / featherstars with diver in the background, Kimbe Bay, West New Britain, Papua New Guinea.

Jurgen Freund / Details of Orange elephant ear sponge (Agelas clathrodes) with crinoids / featherstars attached, Kimbe Bay, West New Britain, Papua New Guinea

Jurgen Freund / Featherstar (Comantheria briareus) on red fancoral. Misool, Raja Ampat, West Papua, Indonesia.

Michele Westmorland / Diver at healthy reef system with large Barrel sponge (Xestospongia testudinaria) covered with crinoids / feather stars (Oxycomanthus bennetti). Mulloway's Reef, Tufi, Papua New Guinea, model released...

Georgette Douwma / Ornate ghostpipefish {Solenostomus paradoxus} camouflaged amongst crinoids, Lembeh Strait, Sulawesi, Indonesia

Brandon Cole / Scuba diver swimming over colourful Coral reef with Sponge growth and Crinoids. Dominica, Caribbean Sea.

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

Chris Newbert / Reef scenic at one-hundred-twenty feet, showing Soft Corals, Sea Fans, Crinoids, Leather Corals, Sea Whips and Sponges, Solomon Islands

Fred Bavendam / Common Lionfish (Pterois volitans) lurking among Feather Star Crinoids clinging to the lip of a large Barrel Sponge, Bali, Indonesia

Fred Bavendam / Sweeper (Parapriacanthus sp) and Basslet school (Pseudanthias sp) feeding in the currents above a coral plate covered with Crinoids, Papua New Guinea

Fred Bavendam / Sea Goldie (Pseudanthias squamipinnis) group feeding in the currents on a steep slope with Soft Corals, Crinoids and Gorgonians, Kimbe Bay, Papua New Guinea

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.

Pascal Kobeh / Barrel sponge (Xestospongia testudinaria) covered with Lampert's sea cucumbers (Synaptula lamperti). Crinoids and Feather stars (Crinozoa) also on Sponge. Jewel fairy basslets (Pseudanthias squami...

Pascal Kobeh / Ornate ghost pipefish (Solenostomus paradoxus) on sea floor. This species is a mimic and is well camouflaged amongst Crinoids and Soft coral. Flores Sea, 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 / Striped snapping shrimp (Synalpheus striatus) (Synalpheus stimpsoni) living on crinoids. West Papua, Indonesia. Indo-West Pacific.

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.