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"