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.

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

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

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

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

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

Juergen 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

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

Juergen 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

Juergen 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 / Scalefin Anthias (Pseudanthias squamipinnis) group feeding in the currents on a steep slope with Soft Corals, Crinoids and Gorgonians, Kimbe Bay, Papua New Guinea

Magnus Lundgren / Close up of three arms from a Feather star (Crinoidea), Triton Bay, West Papua, Indonesia, Pacific Ocean.

Magnus Lundgren / Detail of a Feather star (Crinoidea), Triton Bay, West Papua, Indonesia, Pacific Ocean.

Magnus Lundgren / Fan coral (Gorgonia sp.) with two clinging Feather star (Crinoidea), Raja Ampat, West Papua, Indonesia, Pacific Ocean.

Alex Mustard / Feather star shrimp (Hippolyte prideauxiana) in a Red feather star (Antedon bifida). This observation greatly expands the known range of this rare species of shrimp in the UK, Eyemouth, Scotland, UK,...

Alex Mustard / Deep red Feather star shrimp (Hippolyte prideauxiana) crawling secretly amongst the arms of a Feather star (Antedon bifida), Loch Duich, Highands, Scotland, UK.

Alex Mustard / Ornate ghost pipefish (Solenostomus paradoxus), juvenile, hides within a crinoid, Dauin Marine Protected Area, Dumaguete, Negros, Philippines. Wildlife Photographer of the Year 2021 competititon cat...

Alex Mustard / Myzostomid crinoid worm (unidentified to species level) living camouflaged on a crinoid. Anilao, Batangas marine protected area, Luzon, Philippines. Verde Island Passages, Tropical West Pacific Ocean.

David Fleetham / Bennett's feather star (Oxycomanthus bennetti), close up of feet / cirri, as it stands on a reef to catch passing food in the current, South Pacific, Fiji.

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

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

Pascal Kobeh / Barrel sponges (Xestospongia sp., probably Xestospongia testudinaria) with feather stars / crinoids, Indonesia, Sea of Flores

Pascal Kobeh / Coral formation with invertebrates and among them feather stars / crinoids and Green cup corals (Tubastrea micrantha) Indonesia, Sea of Flores.

Pascal Kobeh / Barrel sponges (Xestospongia sp., probably Xestospongia testudinaria) with feather stars / crinoids and a school of Smith's damsels (Pomacentrus smithi) on the reef, Indonesia, Sea of Flores

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 abundan...

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.

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

Juergen 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.