Type species: Fenestella eichwaldi Stuckenberg, 1885
This genus includes the species:
| Flexifenestella bellaforma | McKinney & Kriz, 1986 | Early Devonian Pragian | Czech Rep. |
| Flexifenestella eichwaldi | (Stuckenberg, 1885) | Early Permian Artinskian-Kungurian | Russia |
| Flexifenestella eichwaldi magnopora | Schulga-Nesterenko, 1941 | Permian Cisuralian Artinskian | Russia Urals |
| Flexifenestella explorata | Troizkaya, 1975 | Early Carboniferous Tournaisian | Kazakhstan |
| Flexifenestella foraminosa | (Eichwald, 1860) | Late Carboniferous Early Permian |
China Russia |
| Flexifenestella foraminosa grandis | Schulga-Nesterenko, 1936 | Permian Cisuralian Sakmarian-Artinskian | Russia Urals |
| Flexifenestella foraminosa grandissima | Schulga-Nesterenko, 1936 | Permian Cisuralian Artinskian-Kungurian | Russia Urals |
| Flexifenestella komiensis (Primary homonym?) |
(Krutchinina, 1973) | Early Permian Artinskian | Russia |
| Flexifenestella notata | (Trizna, 1950) | Early Permian Sakmarian-Artinskian | Russia |
| Flexifenestella petchorica (petschorica?) |
(Schulga-Nesterenko, 1936) | Early Permian Artinskian | Russia, USA |
| Flexifenestella reteporinaeformis | (Schulga-Nesterenko, 1936) | Early Permian Sakmarian-Artinskian | Russia |
| Flexifenestella reteporoides | (Nekhoroshev, 1953) | Early Carboniferous Tournaisian | Kazakhstan |
| Flexifenestella simplex | Morozova, 1981 | Early Carboniferous Visean | Russia |
| Flexifenestella sinusoida (sinusoidea?) |
(Nekhoroshev, 1956) | Early Carboniferous Tournaisian | Russia |
| Flexifenestella subgrandissima | (Schulga-Nesterenko, 1952) | Early Permian Artinskian | Russia |
| Flexifenestella taidonica | (Nekhoroshev, 1926) | Early Permian Artinskian | Russia |
This information is based upon various sources, but no personal knowledge. I am indebted to the late Alan Horowitz for his compilation, and to Dr. J. Pachut.
I would be grateful for corrections to, or critical reviews of this information. This is not a 'final' version (an impossible ideal), but a working document.
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