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.Helicodiscus parallelus at AnimalBase, accessed 15 December 2008. Great Lakes region. Great Britain as a "hot-house alien" Brazil as an exotic species
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