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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.
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.
In the marine aquarium hobby, they have been seen to consume Asterina Starfish, [4] which are commonly introduced into such aquaria on the ubiquitous "live rock" used in such settings. In 2021 pictures surfaced on Reddit of a linckia eating an Asternia it takes roughly 45 mins to fully devour the starfish. It's a worthy pest control depending ...
The common sunstar is commonly found on rocky bottoms, coarse sand and gravel in the bathyal, infralittoral and circalittoral zone (from low-tide line up to depths of 300 m).
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.
According to the World Register of Marine Species, the following families are included in Valvatida: [5]. family Acanthasteridae Gervais, 1841; family Archasteridae Viguier, 1878
Heliaster solaris commonly known as 24-rayed sunstar is a possibly extinct sea star which was known from the waters near Española Island in the Galápagos Islands.The species was endemic to the Galápagos Island group, where it appears to have been strictly restricted to the waters around the Isla Espanola.