Cryptopygus cisantarcticus is a species of springtail belonging to the family Isotomidae.

[2] Genetic evidence suggests that Cryptopygus cisantarcticus diverged from other Antarctic species around 18-11 million years ago, possibly due to increased glaciation creating barriers between populations.

[3][4] The species is deep blue to black in colour, with a body length of up to 1.75 mm (0.069 in).

[2] It can be distinguished from Cryptopygus antarcticus by the position and length patterns of the posterior setae.

[2] The species is primarily found in moist algal flats,[5] or underneath rocks in association with moss.