- The
Somasteroidea, or Stomasteroidea, is an
extinct order of
asterozoan echinoderms first defined in 1951 by W. K. Spencer.
Their first appearance in...
-
Ophiuroidea (the
brittle stars and
basket stars), and the
extinct taxa
Somasteroidea and Stenuroidea.
Originally proposed in the late 1800s,
Asterozoa was...
-
Stelleroidea as the only
class within the
subphylum Asterozoa, with
Somasteroidea, Asteroidea, and
Ophiuroidea as subclasses. By a 1980
revision of the...
-
fossil record in the Cambrian. The
first known asterozoans were the
Somasteroidea,
which exhibit characteristics of both groups.
Starfish are infrequently...
- that rank in any of the
above include:
Cryptosyringida Smith, 1984
Somasteroidea Spencer, 1951
Stenuroidea Spencer, 1951 Cor****idea
Brett et al., 1983...
- Subphylum:
Eleutherozoa Bell, 1891
classes Subphylum Asterozoa class â€
Somasteroidea class Asteroidea class †Stenuroidea
class Ophiuroidea Subphylum Echinozoa...
-
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...
