Tartarus murdochensis is a cave spider from Western Australia, in the family Stiphidiidae.

[2][3] The spider was first described in 1992 by Mike Gray.

[3]

The species epithet, murdochensis, refers to its being found in the Murdoch Sink, a submerged cave system in the Nullarbor Plain of Western and Southern Australia.

[3] In Western Australia, the species is listed as vulnerable.