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 | Cycadophyta Bessey |
| class | Cycadeoideopsida Scott † |
| order | Cycadeoideales Berry † |
| family | Williamsoniellaceae Nakai † |
| genus | Williamsoniella Thomas † |