| classification of the genus according to H. Till \ Series k Periferalia |
Testa-cells ochre till light brown, brittle outer walls, never agleam
Typus: Gymnocalycium megatae Ito
| Species / variety | place of finding |
| G. anisitsii | Brazil, Paraguay, Mato Grosso, Conception |
| G. holdii n.n | Bolivia, Dept. Santa Cruz |
| G. matoense | Brazil, near Porto Murtinho |
| G. megatae | Paraguay, Dept. Boqueron |
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| Gymnocalycium anisitsii |
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