The bat genus Mormopterus belongs to a group commonly referred to as "Free-tailed bats" (although that term can refer to any bat in the Molossidae family. Mormopterus bats were was once included in the genus Tadarida but they have since been proven genetically distinct.
This genus is currently in a state of ongoing study as to its true affinities within the rest of the Molossidae, but as it currently stands, it contains two subgenera, one Australasian containing three species, the other a wide-ranging group with six species including the western side of South America as far south as northern Chile, Cuba, Sumatra, South Africa and East Africa including Madagascar within its far-flung range.
They are as a group somewhat smaller in size in comparison to the majority of the family though still have the long, narrow wings for fast direct flight, very characteristic of this family though some of the Australian species can also scurry after prey on the ground, which is quite unusual behaviour for such aerial animals.
There are ten species within two subgenera: