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![A variety of corals cling to Manning Seamount, just off the coast of Cape Cod, Massachusetts.](/sites/default/files/styles/3_2_small/public/2023-11/2_08-M-02-G-01-040415084532JM_1.jpg.webp?itok=UXrNDtep)
slideshow
Seamounts, A Deep-Sea Habitat
Thousands of seamounts—most of them undersea volcanoes—tower above the muddy......![A basket star with many arms.](/sites/default/files/styles/3_2_small/public/2023-11/Screen_Shot_2018-04-20_at_2_13_45_PM.png.webp?itok=fWJoHwYF)
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Basket Star
Deep sea dwellers, the basket star uses its long, twisting arms to snag...![an orange sea star a top seaweed](/sites/default/files/styles/3_2_small/public/2023-11/pisaster.jpeg.webp?itok=AeHlVa4-)
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The Ochre Star
The ochre sea star (Pisaster ochraceus) exhibits the classic five-fold......![a close up of a sand dollar](/sites/default/files/styles/3_2_small/public/2023-11/Clypeaster_reticulatus.jpg.webp?itok=4ujfB4BW)
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Sand Dollar in the Sea Grass
A sand dollar (Clypeaster reticulatus). ......![a violet sea urchin](/sites/default/files/styles/3_2_small/public/2023-11/seaUrchin_.jpg.webp?itok=F96iwM-9)
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Violet Sea Urchin
A violet sea urchin (Sphaerechinus granularis). ......![a red sea star](/sites/default/files/styles/3_2_small/public/2023-11/starfish-RonKroetz_0.jpeg.webp?itok=ynGVNfNS)
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Red Sea Star
A red sea star from the shore of California. ......![a yellow and brown sea cucumber on a black background](/sites/default/files/styles/3_2_small/public/2023-11/https___collections_nmnh__si__edu_media__irn%3D14273141.jpg.webp?itok=JKOHJOd_)
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Sea Cucumber Close-up
An Euapta tahitiensis from Hawaii. ......![a fringed fossil feather star](/sites/default/files/styles/3_2_small/public/2023-11/NMNH-PALEO_PAL123203_2-cropped.jpg.webp?itok=w5i1QJTO)
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Ancient Crinoid
A fossilized Platycrinus basicraniatus, a crinoid from the Mississippi period......![a star shaped fossil blastoid](/sites/default/files/styles/3_2_small/public/2023-11/NMNH-EO_050623_Blastoid_Pentremites_001cropped.jpg.webp?itok=XNyTxFc6)
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Blastoid Fossil
A fossilized blastoid from the Smithsonian's collection. ......![a box of dried sea stars](/sites/default/files/styles/3_2_small/public/2023-11/NMNH-AsteriashexactisUSNM001368-Lot.jpg.webp?itok=sASJ1mj9)
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A Drawer from the Collections
A box of sea star Asteria hexactis from the Smithsonian's collection. ......![The sea star Odontaster validus and sea urchin Sterechinus neumayeri are often found living in association with one another along the Antarctic coastline, here during the Census of Marine Life.](/sites/default/files/styles/3_2_small/public/2023-11/odontaster_validus_and_sterechinus_neumayeri.JPG.webp?itok=GqE0YYEQ)
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