Chondrula galiciensis Clessin, 1879 (original description)
Helix arbustorum var. septentrionalis Clessin, 1879 accepted as Arianta arbustorum (Linnaeus, 1758) (original description)
Helix instabilis var. bakowskyana Clessin, 1879 accepted as Helicopsis lunulata (Krynicki, 1833) (original description)
Helix lapicida var. medelpadensis Clessin, 1879 accepted as Helicigona lapicida (Linnaeus, 1758) (original description)
Helix obvia var. kroli Clessin, 1879 accepted as Xerolenta obvia (Menke, 1828) (original description)
Limnaea peregra var. bakowskyana Clessin, 1879 accepted as Peregriana peregra (O. F. Müller, 1774) (original description)
Limnaea peregra var. raiblensis Clessin, 1879 accepted as Peregriana peregra (O. F. Müller, 1774) (original description)
Limnaea peregra var. tschapeki Clessin, 1879 accepted as Peregriana peregra (O. F. Müller, 1774) (original description)
Limnaea truncatula var. thiesseae Clessin, 1879 accepted as Galba truncatula (O. F. Müller, 1774) (original description)
Planorbis atticus var. arethusae Clessin, 1879 (original description)
Sphaerium wildi Clessin, 1879 (original description)
Vivipara hellenica Clessin, 1879 accepted as Viviparus hellenicus (Clessin, 1879) (original description)

Greece for Planorbis atticus var. arethusae Clessin, 1879 
Greece for Sphaerium wildi Clessin, 1879 
Greece for Vivipara hellenica Clessin, 1879 
Sweden for Helix arbustorum var. septentrionalis Clessin, 1879 
Sweden for Helix lapicida var. medelpadensis Clessin, 1879