It grows on the south coast between Bremer Bay and the Cape Arid National Park.

[2][3][4][5][6] 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.

[1] The subspecies name (crassa) is a Latin word meaning “thick, or "fat"[8] referring to the broadness of the sepals and petals near their bases.

[3] The Esperance white spider orchid occurs between Bremer Bay and the Cape Arid National Park in the Esperance Plains, Jarrah Forest, Mallee and Warren biogeographic regions where it grows in shrubland that is inundated in winter.

crassa is classified as "not threatened" by the Western Australian Government Department of Parks and Wildlife.