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Sea stars are among the most impressive and famous marine animals. Despite its name, the starfish is not a fish; it’s an echinoderm, closely related to sea urchins and sand dollars...

Sea stars are among the most impressive and famous marine animals. Despite its name, the starfish is not a fish; it’s an echinoderm, closely related to sea urchins and sand dollars...

Crinoid (Promachocrinus kerguelensis), primitive relative of sea stars, highly mobile, mouth is located within the center of the ring of arms, Antarctica; photo by Norbert Wu.

Crinoid (Promachocrinus kerguelensis), primitive relative of sea stars, highly mobile, mouth is located within the center of the ring of arms, Antarctica; photo by Norbert Wu.

Sunflower star (Pycnopodia helianthoides): The sunflower star is the largest sea star in the world, reaching an armspan of 3.3 feet. That space is taken up by 16-24 arms. They're found along the coast of North America, from Alaska to California, but they're largest in the northern areas.

19 bizarre and beautiful starfish species

Sunflower star (Pycnopodia helianthoides): The sunflower star is the largest sea star in the world, reaching an armspan of 3.3 feet. That space is taken up by 16-24 arms. They're found along the coast of North America, from Alaska to California, but they're largest in the northern areas.

During the Cambrian explosion, the diversity of life exploded and bizarre sea creatures such as the  Helcocystis moroccoensis flourished.

Fivefold Symmetry Found in Cambrian Fossil

During the Cambrian explosion, the diversity of life exploded and bizarre sea creatures such as the Helcocystis moroccoensis flourished.

Lovely sand dollars. Inside sand dollars are shells shaped like doves. Truly beautiful work by our Creator.

Lovely sand dollars. Inside sand dollars are shells shaped like doves. Truly beautiful work by our Creator.

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