title: Centrifugus
text: # Centrifugus
  
  †Centrifugus is an extinct species of fossil sea snail, a marine gastropod mollusk in the family Euomphalidae, which paleontologists place in the order Archaeogastropoda.
  
  This species was originally known from the Upper Silurian of northern Europe (Gotland).
  
  ## Description
  
  The shell has a nearly flat spire, and is widest across the base, which is marked by a peripheral keel. The upper side of the aperture has a narrow slit, and a selenizone located close to the upper suture. Five strong spiral cords alternating with weaker ones cover the upper surface of the shell.
  
  