minima is a terrestrial, perennial, deciduous, herb with an underground tuber and which usually grows as solitary plants.

The lateral sepals and petals are linear to lance-shaped in the lower half of their length, then suddenly taper to thin, drooping ends.

[1][2][3] Caladenia longicauda was first formally described by John Lindley in 1840 and the description was published in A Sketch of the Vegetation of the Swan River Colony.

[3] The little white spider orchid is only known from a small area near Yuna in the Geraldton Sandplains biogeographic region where the type specimen was collected.

minima is classified as "Priority Two" by the Western Australian Government Department of Parks and Wildlife,[7] meaning that it is poorly known and known from only one or a few locations.