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"