| Helicodiscus parallelus | |
|---|---|
|  | |
| A drawing of a live specimen of Helicodiscus parallelus | |
| Scientific classification  | |
| Domain: | Eukaryota | 
| Kingdom: | Animalia | 
| Phylum: | Mollusca | 
| Class: | Gastropoda | 
| Subclass: | Heterobranchia | 
| Order: | Stylommatophora | 
| Family: | Helicodiscidae | 
| Genus: | Helicodiscus | 
| Species: | H. parallelus | 
| Binomial name | |
| Helicodiscus parallelus | |
| Synonyms[2] | |
| 
 | |
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.

A drawing of an apertural view of the shell of Helicodiscus parallelus
Distribution
This species occurs in the following countries and islands:
- Northern Mexico.[3]
- Great Lakes region.[4]
- Great Britain as a "hot-house alien"
References
- ↑ Say, T. 1821. Descriptions of univalve shells of the United States. - Journal of the Academy of Natural Sciences of Philadelphia 2 (1): 149-179.
- ↑ "Helicodiscus parallelus". WoRMS. World Register of Marine Species. Retrieved 30 December 2021.
- ↑ Helicodiscus parallelus at AnimalBase, accessed 15 December 2008.
- ↑ List of non-marine mollusks of the Indiana Dunes, Lake Erie, Indiana.
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