heart urchin
Noun
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Noun
heart urchin (plural heart urchins)
- Any echinoderm of the class Spatangoida.
- 2003, Gunther J. Eble, Developmental Morphospaces and Evolution, 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, Volume 16, 3rd Edition, 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.
- 2003, Gunther J. Eble, Developmental Morphospaces and Evolution, James P. Crutchfield, Peter Schuster (editors), Evolutionary Dynamics, page 47 ↗,
- (any species of Spatangoida) spatangoid
This text is extracted from the Wiktionary and it is available under the CC BY-SA 3.0 license | Terms and conditions | Privacy policy 0.003