The Somasteroidea, or Stomasteroidea, is an extinct order of asterozoan echinoderms first defined in 1951 by W. K. Spencer. Their first appearance in...
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Asterozoa (section Somasteroidea)
Ophiuroidea (the brittle stars and basket stars), and the extinct order Somasteroidea. Members of the order Asteroidea are characterised by a star-shaped...
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fossil record in the Cambrian. The first known asterozoans were the Somasteroidea, which exhibit characteristics of both groups. Starfish are infrequently...
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classes: Asteroidea: true sea stars Ophiuroidea: brittle stars and basket stars Somasteroidea (sometimes also Stomasteroidea): ancestral stelleroids v t e...
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ancestor of Asterozoa. H. B. Fell. (1963). A new family and genus of Somasteroidea. Transactions of the Royal Society of New Zealand, Zoology 3(13):143-146...
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Bather, 1900 Classes Subphylum Asterozoa Class Asteroidea Class Ophiuroidea Subphylum Echinozoa Class Echinoidea Class Holothuroidea Order †Somasteroidea...
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