Mormopterus is a genus of molossid microchiropterans, small flying mammals referred to as free-tailed bats.

Investigations of Australian bat systematics have resulted in species confusion, which has in turn inhibited other research and recognition for the purpose of conservation; Mormopterus had presented the greatest difficulties to taxonomic workers.

A revision in 2014 used a multilocus approach, combining morphological and molecular analysis to further separate the genus; this recognised the subgenus Micronomus and erected two new taxa, subgenera Setirostris (monotypic) and Ozimops, which circumscribed four accepted and three new species of Mormopterus.

[5] The Australian Faunal Directory, citing a 2015 taxonomic publication that elevated subgenera published in a 2014 review, recognises genera Ozimops, Setirostris and Micronomus and the new generic combinations of taxa formerly assigned to this genus.

The intergeneric arrangement, prior to 2014 elevation of the four subgenera, may be summarised as: Synonyms of mainly Australian species, later recognised as new genera.