| classification of the genus according to H. Till \ Subsectio B4 Incertae sedis |
Testa-cells with blunt papillae
Typus: Gymnocalycium castellanosii Speg.
| Species / variety | place of finding |
| G. acorrugatum | Argentina, Prov. San Juan, San Agustin de Valle Fertil, Sierra del Valle Fertil, 850 m |
| G. bozsingianum | Argentina, Prov. La Rioja |
| G. castellanosii | Argentina, Prov. La Rioja, San Juan |
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| Gymnocalycium castellanosii |
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