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 | Horneophyta † |
| class | Horneophytopsida † |
| order | Horneophytales † |
| family | Horneophytaceae Kenrick & Crane † |
| genus | Caia Fanning et al. † |