Meaning of heart urchin | Babel Free

Definitions

Any echinoderm of the class Spatangoida.

Examples

“Red heart urchins, like other heart urchins, are usually buried under the sand and are only seen on rare occasions.”

“Spatangoids constitute a monophyletic group of heart urchins that appears in the early Cretaceous (145 M.Y. ago) and ranges to the Recent.”

“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.”

CEFR level