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Pronunciation varies by accent · noun
Any echinoderm of the order Clypeasteroida of sand dollars..
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.
At ordinal levels, in cassiduloids and holectypoids, ambitus is circular, elliptical or oval, while clypeasteroids have a pentagonal to circular type.
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.
Use clypeasteroid when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Clypeasteroid means Any echinoderm of the order Clypeasteroida of sand dollars..
Common synonyms include pansy shell, sand dollar, sea cookie, snapper biscuit.
The opposite depends on the specific sense.
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.
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