Position in a system
| system | Vitae - living organisms |
| domain | Eukaryota Whittaker & Margulis, 1978 - lifeforms with nucletic cells |
| superregnum | Bikonta - bikonts |
| Corticata | |
| Archaeplastida | |
| kingdom | Plantae Haeckel - plants |
| divisio | Rhyniophyta Cronq., Takht. et Zimmerm. † |
| class | Trimerophytopsida A.S. Foster et Gifford † |
| order | Trimerophytales H. Banks ex S.V. Meyen † |
| family | Trimerophytaceae Bierhorst † |
| genus | Oocampsa H.N. Andrews, P.G. Gensel et A.E. Kasper † |