sentences:  Thalassoceratoidea
  
  Thalassoceratoidea, formerly Thalassocerataceae, is a superfamily of Late Paleozoic ammonites characterized by their thick-discoidal to subglobular, involute shells with narrow or closed umbilici and biconvex growth striae with ventral sinuses.The ventral lobe of the suture, which straddles the outer rim, is wide, and bifid, with a tall median saddle.