Speleomaster is a genus of armoured harvestmen in the family Cryptomastridae. There are at least two described species in Speleomaster, both found in lava tubes of the Snake River Plain in southern Idaho.
Species
These two species belong to the genus Speleomaster:
Briggs, Thomas S. (1974). "Troglobitic harvestmen recently discovered in North American lava tubes (Travuniidae, Erebomastridae, Triaenonychidae: Opiliones)". The Journal of Arachnology. 1 (3): 205–214. JSTOR3705196.