Spatangoidea

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Spatangoidea \Spat`an*goi"de*a\, n. pl. [NL. See {Spatangus},
     and {-oid}.] (Zool.)
     An order of irregular sea urchins, usually having a more or
     less heart-shaped shell with four or five petal-like
     ambulacra above. The mouth is edentulous and situated
     anteriorly, on the under side.


     [1913 Webster]