Starfish
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Starfish or sea stars are a class of echinoderms generally shaped like a star polygon. Starfish are also known as asteroids because they form the taxonomic class Asteroidea. About 1,900 species of sta
Luidia maculata, a seven armed starfish
Astropecten aranciacus ossicles
Pedicellariae and retracted papulae among the spines of Acanthaster planci
Pedicellaria and papulae of Asterias forbesi
Asterozoa
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The Asterozoa are a subphylum in the phylum Echinodermata, within the Eleutherozoa. Characteristics include a star-shaped body and radially divergent axes of symmetry. The subphylum includes the class
Starfish
…tissue. The earliest fossil echinoderms date to the Cambrian, with the first asterozoans (a group that includes starfish and brittle stars) being the Somasteroidea, which exhibit traits of both groups. Starfish are infrequently found as fossils, possibly because their hard skeletal components separate as the animal…
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