sentences:  Acanthinites
  
  Acanthinites is a genus of extinct cephalopods belonging to the ammonoid order Ceratitida described by Mojsisovics in 1893 who established the type species of the group as "Acanthinites excelsus".The Shell is involute, compressed; sides arched, converging on narrow venter with a central furrow bordered by low serrated keels.