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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 sea stars are considered “functionally extinct” in California and Oregon.
Starfish are included in the subphylum Asterozoa, the characteristics of which include a flattened, star-shaped body as adults consisting of a central disc and multiple radiating arms. The subphylum includes the two classes of Asteroidea, the starfish, and Ophiuroidea , the brittle stars and basket stars.
Within the urchin barrens, group of starfishes, sand dollars, and brittle stars scavenge across the barrens while facing against their fierce predator, Sunflower sea star. In Southern Africa , as chokka squid are preyed on by short-tail stingray and sand tiger shark , the Cape fur seals that share the waters are hunted by the world's largest ...
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If attacked by a predator such as the morning sun star (Solaster dawsoni) or the sunflower star (Pycnopodia helianthoides), the slime star emits great quantities of repellent mucus and can often evade the predator. [3] The mucus is toxic and has been shown to kill other invertebrates immersed in it. [3]
Fromia indica Nectria ocellata Neoferdina insolita. Goniasteridae are usually middle-sized sea stars with a characteristic double range of marginal plates bordering the disk and arms.