Genus
Eutretocystis Phleger, 1935
Aiheeseen liittyvät julkaisut
Phleger, F. B. 1935. Some Ordovician cystids from Russia. Bulletin of the Museum of Comparative Zoology. Harvard University Museum of Comparative Zoology LXXVI, 5, 193-201.
List of species
1. Eutretocystis acutirostris Phleger, 1935 | Kunda Stage
2. Eutretocystis similis Phleger, 1935 | Kunda Stage
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Luokittelu
| Organism group | Biota |
| Kingdom | Animalia |
| Phylum | Echinodermata |
| Subphylum | Blastozoa |
| Class | Rhombifera |
| Order | Dichoporita |
| Superfamily | Glyptocystitoida |
| Family | Echinoencrinitidae |
| Subfamily | Gonocrinites |
| Genus | Echinoencrinites |
| Erinocystis | |
| Eutretocystis | |
| Species | acutirostris |
| similis | |
| Genus | Fusicystis |
| Glaphyrocystis | |
| Proctocystis | |
| Schizocystis | |
| Scoliocystis |