Helicodiscus parallelus (Say, 1821) Compound Coil

Five Points, Jacksonville, FL. Major diameter 3.3 mm.

Helicodiscus notius notius Hubricht, 1962 Tight Coil

Ft. George Is., Jacksonville, FL. Major diameter 3.3 mm.

Helicodiscus fimbriatus Wetherby, 1881 Fringed Coil

Near Florida Caverns, Marianna, FL. Major diameter 3.6 mm.