Dictionary

clypeasteroid en · NOUN

Meanings

1. Any echinoderm of the order Clypeasteroida of sand dollars.
   • 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. 2009, Andrew B. Smith, “Sea urchins (Echinoidea)”, in S. Blair Hedges, Sudhir Kumar, editors, The Timetree of Life, page 302:
   • 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. 2006, Robert Wynn Jones, Applied Palaeontology, page 181:
   • At ordinal levels, in cassiduloids and holectypoids, ambitus is circular, elliptical or oval, while clypeasteroids have a pentagonal to circular type. 2008, Anis Kumar Ray, Fossils in Earth Sciences, page 217:

Forms

Hyponyms

sea biscuit (species of Clypeasteroida)

Synonyms

pansy shell (any species of Clypeasteroida) · snapper biscuit (any species of Clypeasteroida) · sea cookie (any species of Clypeasteroida) · sand dollar (any species of Clypeasteroida)