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Photo taken during  central Florida survey.                                      MYAU Anabat file recorded  in Clay Co FL September 2008                  
Red  arrow points to MYAU roosting in culvert seam

Southeastern Myotis, Myotis austroriparius austroriparius


Echolocation: 50K Myotis.   LF = 40 – 50, extending to 80K, stick shaped

Florida Distribution:  Disjunct populations north and central FL

Roosting Behavior: Colonial.  Males sometimes solitary. Buildings, bridges/, culverts, storm water drainage systems below roadways, tree cavities in or near mature swamps, caves.     Sometimes roosts with TABR and NYHU.  Individuals have been observed roosting with Corynorhinus & Pipistrellus (Finn unpublished).

Foraging Behavior: Over and near water,  flies low, just above surface. Midges, small moths and other small soft-bodied insects

Reproduction: Twins born late April – mid May     

Management and Conservation Recommendations:  due to its behavior of roosting in very large numbers during maternity season the population is considered at risk in the event a catastrophic event occurs at one of those roost sites. MYAU  have been documented roosting  in bridges, culverts , structures & bat houses.  It was the most numerous species encountered during surveys at several sites in FL and GA.  Education programs aimed at the public, installation of bat houses, conservation of forested wetlands and adjacent habitat, preservation of cavity trees and protection of culverts that are occupied by roosting bats will benefit this and other bat species.           

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Urban Bat Status






Former C2 / SAR

S3 Vulnerable



Status & distribution under review by USFWS (Dec 2008).


Mass g

FA mm


Total length



5 – 8

35 – 22

238 – 270

82 – 87

½ length of ear, pointed

not keeled

Gray to reddish with lighter underside, long hairs on toes