Ia (genus)

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Temporal range: Miocene and Recent
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Chiroptera
Family: Vespertilionidae
Subfamily: Vespertilioninae
Genus: Ia
Thomas, 1902

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,[1] 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.

At two letters, Ia is the shortest possible name of any animal genus under the International Code of Zoological Nomenclature.[2]


  1. ^ 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. 
  2. ^ International Commission of Zoological Nomenclature. 1999. International Code of Zoological Nomenclature, Art. 11.8. Online at http://www.iczn.org/iczn/index.jsp


  • Simmons, N.B. (2005). "Order Chiroptera". In Wilson, D.E.; Reeder, D.M. Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Johns Hopkins University Press. pp. 312–529. ISBN 978-0-8018-8221-0. OCLC 62265494. 
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