heart urchin
From Wiktionary, the free dictionary
Noun
heart urchin (plural heart urchins)
- Any echinoderm of the class Spatangoida.
- 2003, Gunther J. Eble, “Developmental Morphospaces and Evolution”, in James P. Crutchfield, Peter Schuster, editors, Evolutionary Dynamics, page 47:
- Spatangoids constitute a monophyletic group of heart urchins that appears in the early Cretaceous (145 M.Y. ago) and ranges to the Recent.
- 2007, Marian Armstrong, Wildlife and Plants, 3rd edition, volume 16, page 967:
- The class of animals (Echinoidea) that sea urchins belong to includes sand dollars and heart urchins. Sand dollars are flat, while heart urchins are oval, covered in short spines with longer spines down their back.
Synonyms
- (any species of Spatangoida): spatangoid
See also
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