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