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Is a starfish an animal?

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The word starfish refers to about 1,800 species of marine animals that are star-shaped. The common term starfish is confusing, though. Starfish aren't fish - finned, tailed animals with backbones - they are echinoderms, which are marine invertebrates. ... All sea stars are in the Class Asteroidea. read more

The word starfish refers to about 1,800 species of marine animals that are star-shaped. The common term starfish is confusing, though. Starfish aren't fish - finned, tailed animals with backbones - they are echinoderms, which are marine invertebrates. So scientists prefer to call these animals sea stars. read more

Starfish are deuterostome animals, like the chordates. A 2014 analysis of 219 genes from all classes of echinoderms gives the following phylogenetic tree. The times at which the clades diverged is shown under the labels in millions of years ago (mya). read more

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