Skip to main content
Smithsonian National Museum of Natural History, North American Mammals

  Chiroptera · Vespertilionidae · Myotis austroriparius

Search the Archive
 • Species Name
 • Family Tree
 • Conservaton Status
 • Skulls
 • Bones and Teeth
Field Guide
 • Map Search
   Including search by
     • Location
     • Ecoregion
     • Species
     • National Park
 • About Maps
Teacher Resources
About the Site
Smithsonian Institution
Copyright Notice
Privacy Notice

* PDF reader
available here

(opens in a new window)

Myotis austroriparius

Southeastern Myotis

Order: Chiroptera
Family: Vespertilionidae

Image of Myotis austroriparius
Myotis austroriparius - typical gray coat on right, orange-brown variant on left
Click to enlarge this image. (87 kb)

Conservation Status: Least Concern.

The southeastern myotis occurs as far west as northeastern Texas and southwestern Oklahoma. Its preferred daytime roosts are caves with pools of water. It forages over water, at time of night when many species of aquatic insects emerge. It has not been found to migrate. This is the only myotis that has twins. Pups are born in late April and May.

Also known as:

Mississippi Myotis

Sexual Dimorphism:

Females are larger than males.


Average: 83.7 mm males; 87.2 mm females
Range: 77-89 mm males; 80-97 mm females


Average: 5.9 g males; 6.9 g females
Range: 51.-6.8 g males; 5.2-8.1 g females


Rhoads, S.N., 1897.  A new southeastern race of little brown bat, p. 227. Proceedings of the Academy of Natural Sciences of Philadelphia, 49:227-228.


Mammal Species of the World (opens in a new window).

Mammalian Species, American Society of Mammalogists' species account * (opens in a new window).
* PDF reader available here (opens in a new window).

Distribution of Myotis austroriparius

Image of Myotis austroriparius
Click to enlarge this image. (138kb)

Skull of Myotis austroriparius
Click to enlarge this image. (22kb)

end of text