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Underside of a sunflower sea star. Sunflower sea stars can reach an arm span of 1 m (3.3 ft). They are the heaviest known sea star, weighing about 5 kg. [4] They are the second-biggest sea star in the world, second only to the little known deep water Midgardia xandaros, whose arm span is 134 cm (53 in) and whose body is 2.6 cm (roughly 1 inch) wide. [7]
Solaster dawsoni attacking a spiny red sea star, Hippasteria spinosa An adult specimen of Solaster dawsoni afflicted by the Sea star wasting disease off Vancouver. The morning sun star is a predator, feeding mostly on other starfish. It is feared by other stars which move away as fast as they can if touched by a morning sun star.
The common sunstar is distributed from the Arctic down to the English Channel, in the North Sea, also on both East (from the Arctic to the Gulf of Maine) and Pacific coasts (from Alaska to Puget Sound) of North America. It is also circumboreal, found in Greenland, Iceland, the Barents Sea, Kola Bay, Okhotsk Sea and the White Sea.
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About 260 extant species within 70 genera are currently known, which make this family the most diverse of all the sea stars, [5] even if half of the genera are monospecific.
A starfish has five identical arms with a layer of “tube feet” beneath them that can help the marine creature move along the seafloor, causing naturalists to puzzle over whether sea stars have ...
Labidiaster annulatus is found around the Antarctic Peninsula, South Georgia and the South Sandwich Islands.The depth range is from the intertidal zone down to 554 metres (1,818 ft) but this starfish most commonly occurs between 30 and 400 metres (98 and 1,312 ft).
Heliaster kubiniji is a species of starfish in the order Forcipulatida. It is commonly known as the gulf sun star , the common sun star or estrella de mar de golfo and it occurs in the intertidal zone of the Pacific coast of California, Mexico and Nicaragua.