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Corals, sponges, and algae are the major components of most coral reef communities as shown in this picture.
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Corals and Coral Reefs

 Coral reefs are the most diverse of all marine ecosystems. They teem with life,...
Juvenile Clam with Tentacles
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Spaceship Mollusk

 No, this is not an alien spaceship from another world—it is a baby file clam...
Fireworm Setae
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Fireworm Bristles

 No, this isn't a bundle of paintbrushes: you're looking at a fireworm...
Even when a lobster is still a developing egg, you can see some of its adult features: an eye and legs.
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Lobster Egg

 Even when a lobster is still a developing egg, you can see some of its adult...
This tentacle belongs to a blue button. While it has a central “float” with streaming tentacles like typical jellyfish, the blue button is a colony of many small hydroid animals.
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Blue Button Tentacle

 This tentacle belongs to a blue button (Porpita porpita), an animal that looks like...
Lacy Crust Bryozoans
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Lacy Crust Bryozoan

 This colony of a lacy crust bryozoan (Membranipora membranacea) started off as just...
A live coral polyp with turquoise tissue and brown tentacles closes its mouth (the slit at the center of the radiating ribs) tight.
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Closed-Mouth Coral

 A live coral polyp with turquoise tissue and brown tentacles closes its mouth (the...
Beating Cilia of Comb Jelly Combs
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Sea Gooseberry Larva

 These beautiful wisps are the hair-like cilia of a sea gooseberry larva, a common...