Molearachne is a monotypic genus of spiders in the family Lycosidae containing the single species, Molearachne sanctaehelenae.
Molearachne sanctaehelenae is endemic to St. Helena, where it has been found in Prosperous Bay Plain and Bradleys.
This species constructs mounds out of dry earth, and may interconnect several of these using web tunnels. They spend the night under one of these mounds.
The genus name is a combination of mole and Ancient Greek ("spider"), referring to both moles and these spiders creating earth mounds.