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"

• Brazil as an exotic species

References