class Asteroidea

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  • The Oreasteridae are a family of sea stars in the class Asteroidea.
  • Starfish or sea stars are star-shaped echinoderms belonging to the class Asteroidea.
  • Starfish or sea stars are echinoderms belonging to the class Asteroidea.
  • Ambulacral is a term typically used in the context of anatomical parts of the phylum Echinodermata or class Asteroidea and Edrioasteroidea.
  • It was clearly an echinoderm but at first it was considered to be sufficiently different from starfish, class Asteroidea, as to warrant it being placed in a new class of its own, the Concentricycloidea.
  • The Valvatida are an order of sea star in the class Asteroidea, which contains 695 species in 172 genera in 17 families.
  • The former view gained acceptance, and since 2006, they are currently considered a sister group to the Infraclass Neoasteroidea, which represents all post-Paleozoic asteroids within the Class Asteroidea.
  • It was found that X. medusiformis was indubitably a member of class Asteroidea and was a sister taxon to Rathbunaster in the order Forcipulatida.
  • The class Asteroidea belongs to the phylum Echinodermata.
  • The largest species of echinoderm in terms of bulk is the starfish species Thromidia gigas, of the class Asteroidea, which reaches a weight of over 6 kg (13 lb).