Seastar
Sea star, also called starfish, any
marine invertebrate of the class Asteroidea (phylum Echinodermata)
having rays, or arms, surrounding an indistinct central disk. Despite
their older common name, they are not fishes.
The roughly 1,600 living species of sea stars occur in all oceans; the northern Pacific has the greatest variety. Most species are 20 to 30 cm (8 to 12 inches) across; some are only 1 cm (0.4 inch), and others are as much as 65 cm (25 inches) across.
The roughly 1,600 living species of sea stars occur in all oceans; the northern Pacific has the greatest variety. Most species are 20 to 30 cm (8 to 12 inches) across; some are only 1 cm (0.4 inch), and others are as much as 65 cm (25 inches) across.
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