Genus
Estoniocaulis Obut et Rytzk, 1958
Classification
| Organism group | Biota |
| Kingdom | Plantae |
| Organism group | Algae (informal) |
| Phylum | Chlorophyta |
| Rhodophyta | |
| Class | Chuariaphyceae |
| Vendophyceae | |
| Genus | Boučekocaulis |
| Crinocaulis | |
| Doushantuophyton | |
| Estoniocaulis | |
| Hoeegonites | |
| Inocaulis | |
| Microweedia | |
| Nuia | |
| Rhadinograptus | |
| Siphonophycus | |
| Thallograptus (algae) |