| classification of the genus according to H. Till \ Subsectio C1 Terminalia |
Seeds spheroidal, small Hilum-Mikropylar region
Typus: Gymnocalycium mihanovichii
| Species / variety | place of finding |
| G. damsii | Paraguay, Dept. Conception |
| G. friedrichii | Bolivia, Paraguay, Dept. Santa Cruz, Dept. Alto Paraguay |
| G. eurypleurum | Paraguay, Dept. Alto Paraguay |
| G. mihanovichii | Argentina, Paraguay, Prov. Formosa, Dept. Boqueron, Dept. Alto Paraguay |
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| Gymnocalycium mihanovichii |
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