Mystacina is the sole surviving genus of the Mystacinidae family of bats. It has three known species, of which only the New Zealand lesser short-tailed bat (Mystacina tuberculata) is confirmed to survive today. The closely related New Zealand greater short-tailed bat (Mystacina robusta) has not had a confirmed sighting since 1965 and is thought to be extinct. The third species, Mystacina miocenalis, is known from the Middle Miocene, some 19–16 million years ago.