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2006, Robert Wynn Jones, Applied Palaeontology, page 181:
Their living representatives include the sea urchins or 'true' echinoids, the heart-urchins or spatangoids and allied forms, the sand-dollars or clypeasteroids, and the slate-pencil-urchins, or cidaroids.
2008, Anis Kumar Ray, Fossils in Earth Sciences, page 217:
At ordinal levels, in cassiduloids and holectypoids, ambitus is circular, elliptical or oval, while clypeasteroids have a pentagonal to circular type.
2009, Andrew B. Smith, “Sea urchins (Echinoidea)”, in S. Blair Hedges, Sudhir Kumar, editors, The Timetree of Life, page 302:
Their traditional taxonomy, based on skeletal characters, has been largely corroborated by recent molecular phylogenetic analyses with one marked exception: clypeasteroids are not found to be monophyletic.
