Definition of Somasteroidea. Meaning of Somasteroidea. Synonyms of Somasteroidea

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Definition of Somasteroidea

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Meaning of Somasteroidea from wikipedia

- starfish or sea stars), Ophiuroidea (the brittle stars and basket stars), Somasteroidea (early asterozoans from which the other classes most likely evolved)...
- The Somasteroidea, or Stomasteroidea, is an extinct order of asterozoan echinoderms first defined in 1951 by W. K. Spencer. Their first appearance in...
- fossil record in the Cambrian. The first known asterozoans were the Somasteroidea, which exhibit characteristics of both groups. Starfish are infrequently...
- in any of the above taxonomies include: Cryptosyringida Smith, 1984 Somasteroidea Spencer, 1951 Stenuroidea Spencer, 1951 Coronoidea Brett et al., 1983...
- each series running perpendicular to the ambulacra is a feature of the Somasteroidea. However, Villebrunaster lacks axially oriented ossicles along the lateral...
- Stelleroidea as the only class within the subphylum Asterozoa, with Somasteroidea, Asteroidea, and Ophiuroidea as subclasses. By a 1980 revision of the...
- Subphylum: Eleutherozoa Bell, 1891 classes Subphylum Asterozoa class †Somasteroidea class Asteroidea class †Stenuroidea class Ophiuroidea Subphylum Echinozoa...