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 | Magnoliophyta Cronquist, Takht. & W.Zimm. - flowering plants |
| class | Liliopsida Batsch - monocotyledons |
| order | Asparagales Bromhead |
| family | Orchidaceae Juss. - orchids |
| subfamily | Orchidoideae Eaton |
| tribus | Diurideae (Endl.) Lindl. |
| subtribus | Caladeniinae Pfitzer |
| genus | Caladenia R. Br. |
| species | Caladenia longicauda Lindl. - Common Spider-orchid |
| subspecies | Caladenia longicauda subsp. merrittii Hopper & A.P.Br. |