Schwartz's myotis (Myotis martiniquensis)

GenusMyotis (1)
SizeHead-body length: 3.5 - 8 cm (2)

Schwartz’s myotis is classified as Vulnerable (VU) on the IUCN Red List (1).

Very little is known about Schwartz’s myotis (Myotis martiniquensis), a threatened bat from the Caribbean. Myotis bats are also known as the mouse-eared bats (3), a reference to their large ears (4), and typically have brown upperparts with paler underparts (5). All Myotis bats have an elongated muzzle, soft fur and a distinctive ear tragus (4). Two subspecies of Schwartz’s myotis are recognised: Myotis martiniquensis martiniquensis and Myotis martiniquensis nyctor. M. m. nyctor has longer and silkier fur than the woolly fur of M. m. martiniquensis (6).

Schwartz’s myotis has only been found in the Caribbean. Myotis martiniquensis martiniquensis occurs on Martinique and Myotis martiniquensis nyctor occurs on Barbados (6).

Like many bats, Schwartz’s myotis roosts in caves (7) and has also made use of human settlements for roosting (8).Martinique is a volcanic, tropical island with Mount Pelée being the island’s large volcano. Barbados has a unique geology created from extinct coral reefs, which has meant the island has many caves for the bat to roost in (9).

Schwartz’s myotis is insectivorous (5). Unfortunately, there is little else known about this species and its biology. Some Neotropical (tropical American) Myotis species have been found to mate all year round, with the exception of the rainy season (10), and this may be applicable to Schwartz’s myotis. Most Neotropical (tropical American) bats do not hibernate, but spend a short time every day in a state of torpor, where the body ‘shuts down’ temporarily to conserve energy (11).

Currently, the only known major threat to Schwartz’s myotis is hurricanes (1), which damage the habitat in which the bat feeds and roosts. Climate change is likely to increase this threat (1) as it is expected that climatic changes will stimulate more extreme weather events, including increased frequency and severity of tropical hurricanes (12) (13).

As so little is known about Schwartz’s myotis, recommended conservation actions involve undertaking research on this species (1), which would help to inform any future conservation measures.

To learn more about bat conservation see:

This information is awaiting authentication by a species expert, and will be updated as soon as possible. If you are able to help please contact:

  1. IUCN Red List (October, 2010)
  2. Eisenberg, J.F. and Redford, K.H. (2000) Mammals of the Neotropics: Ecuador, Bolivia and Brazil. University of Chicago Press, Chicago.
  3. Wilson, D.E. and Reeder, M.D. (2005) Mammal Species of the World. A Taxonomic and Geographic Reference. The Johns Hopkins University Press, Baltimore, Maryland. Available at:
  4. Skinner, J.D. and Chimimba, C.T. (2005) The Mammals of the Southern African Subregion. Cambridge University Press, Cape Town.
  5. Nowak, R.M. (1999) Walker's Mammals of the World. The Johns Hopkins University Press, Baltimore, Maryland.
  6. LaVal, R.K. and Schwartz, A. (1974) A new bat of the genus Myotis from Barbados. Caribbean Journal of Science, 14: 189-191.
  7. Timm, R.M. and Genoways, H.H. (2003) West Indian mammals from the Albert Schwartz Collection: Biological and historical information. Scientific Papers of the University of Kansas Natural History Museum, 29: 1-47.
  8. Rodríguez-Durán, A. and Kunz, T.H. (2001) Biogeography of bats of the West Indies: An ecological perspective. In: Woods, C. and Sergile, F. (Eds.) Biogeography of the West Indies. CRC Press, Boca Raton, Florida.
  9. Blanchon, P. and Eisenhauer, A. (2001) Multi-stage reef development on Barbados during the Last Interglaciation. Quaternary Science Reviews, 20: 1093-1112.
  10. Wilson, D.E. and Findley, J.S. (1971) Spermatogenesis in some Neotropical species of Myotis. Journal of Mammalogy, 52: 420-426.
  11. Kelm, D.H. and von Helversen, O. (2007) How to budget metabolic energy: torpor in a small Neotropical mammal. Journal of Comparative Physiology B, 177(6): 667-677.
  12. Intergovernmental Panel on Climate Change (April, 2011)
  13. United Nations Economic and Social Commission for Asia and the Pacific (2000) Ministerial Conference on Environment and Development in Asia and the Pacific – Climate Change and the Pacific. Kitakyushu, Japan.