title: Helicodiscus parallelus
text: # Helicodiscus parallelus
  
  Helicodiscus parallelus, common name the compound coil, is a species of small air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Helicodiscidae.
  
  Helicodiscus parallelus is the type species of the genus Helicodiscus.
  
  ## Distribution
  
  This species occurs in the following countries and islands:
  
  * Northern Mexico.
  * Great Lakes region.
  * Great Britain as a "hot-house alien"
  