Temporal range: Miocene–Recent
Ia is a genus of bat in the family Vespertilionidae. It belongs to the subfamily Vespertilioninae and has been placed in the tribe Vespertilionini. In the past, it has also been considered a synonym or subgenus of the genera Pipistrellus or Eptesicus, which used to contain many more species than they do now. Ia comprises a single living species, the great evening bat (I. io) of eastern and southeastern Asia, and one extinct fossil species, I. lanna, from the Miocene epoch in Thailand. Another living species, I. longimana, was recognized in the past, but it is no longer considered a valid species distinct from the great evening bat.
- Thomas, Oldfield (1902). "XXIV.—On two new mammals from China". Annals and Magazine of Natural History. 7. 10 (56): 163–166. doi:10.1080/00222930208678653. ISSN 0374-5481. OCLC 4806273880. Retrieved 16 March 2018.
- Thabah, A.; Li, G.; Wang, Y.; Liang, B.; Hu, K.; Zhang, S.; Jones, G. (2007). "Diet, echolocation calls, and phylogenetic affinities of the great evening bat (Ia io; Vespertilionidae): Another carnivorous bat". Journal of Mammalogy. 88 (3): 728–735. doi:10.1644/06-MAMM-A-167R1.1.
- International Commission of Zoological Nomenclature. 1999. International Code of Zoological Nomenclature, Art. 11.8. Online at http://www.iczn.org/iczn/index.jsp