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
A drawing of a live specimen of Helicodiscus parallelus
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Order:	Stylommatophora
Family:	Helicodiscidae
Genus:	Helicodiscus
Species:	H. parallelus
Binomial name
Helicodiscus parallelus (Say, 1821)[1]
Synonyms[2]
Helicodiscus (Helicodiscus) parallelus (Say, 1821) Helicodiscus lineatus (Say, 1817) Helicodiscus theresa Thiele, 1927 Helix lineata Say, 1817 Planorbis paralellus Say, 1821

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"