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Many Antarctic creatures, like the dinner-plate-sized sea spiders, have evolved to a gigantic size to cope with the extreme environment.
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Cold-Water Sea Spider

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This is a series of images showing how a typical nightly courtship display would look like, where certain males initiate the display (2), others follow (3), and different species display their own unique “light shows” nearby (4 and 5).
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A typical nightly courtship display for P. annecohenae

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Two squid mating
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Squid Mating

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Close-up image of white starfish feet.
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Starfish Feet

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A white nudibranch with orange-colored tips.
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A Fiery Nudibranch

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A shrimp lives in an anemone
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Life in the Snakelocks' Tentacles

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The loco (Concholepas concholepas, often called the Chilean abalone, although it isn’t actually an abalone) is found along the entire coast of Chile.
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The Loco of Chile

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A cross-section of a nautilus shell is not only beautiful, it also is a great example of the chambered cephalopod shell. The projections splitting each chamber are the siphuncle tubes that allow gas and liquid to be transferred from chamber to chamber. 
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Chambered Shells

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Octopus, squid, cuttlefish, and nautilus all have differently shaped pupils— an octopus has a rectangular pupil.
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Octopus Eyes

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Three types of squid tentacles and their suckers
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A Squid's Suckers

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Acorn barnacles living on top of a crab.
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An Edible Crab Covered with Barnacles

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A photo of a red-colored sea anemone photographed in the Baltic Sea.
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Urticina Felina, a Baltic Sea Anemone

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