Definitions
from The Century Dictionary.
- noun A genus of fossil seaurchins or Echinoidea having a heart-shaped tumid test. It is very abundant in the Cretaceous rocks and occurs also in the early Tertiary.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Paleon.) A genus of sea urchins, similar to Spatangus, abounding in the chalk formation; -- from the starlike disposal of the ambulacral furrows.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun paleontology Any of the
extinct genus Micraster ofinfaunal echinoids .
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
From the genus name.
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