Georgia pigtoe (Pleurobema hanleyianum)
Where Listed: WHEREVER FOUND
The Georgia pigtoe (Pleurobema hanleyianum) is a freshwater mussel in the family Unionidae (Figure 1). It was described in 1852 by I. Lea as Unio hanleyianum from the Coosawattee River in Georgia. It was placed in the genus Pleurobema by Simpson in 1900. The uniqueness of the Georgia pigtoe has been verified both morphologically (Williams et al. 2008) and genetically (Campbell et al. 2008). The shell of the adult Georgia pigtoe reaches about 50 to 65 millimeters (mm) (2 to 2.5 inches (in)) in length. It is oval to elliptical and somewhat inflated. The posterior ridge is low and evenly rounded when evident. The anterior end is rounded, while the posterior margin is bluntly pointed below. Dorsal and ventral margins are curved, and the beaks rise slightly above the hinge line. The periostracum (membrane on the surface of the shell) is yellowish-tan to reddish-brown and may have concentric green rings. The beak cavity is shallow, and the shell interior is white to dull bluish-white (Parmalee and Bogan 1998, Williams et al. 2008). The Georgia pigtoe is currently known from a few isolated shoals in the Upper Conasauga River in Murray and Whitfield Counties, Georgia, and in Polk County, Tennessee (Johnson and Evans 2000, Evans 2001) (Figure 2). All recent collection sites occur within a 43-km (27-mi) reach of the river. Within this reach, the Georgia pigtoe is very rare (Johnson and Evans 2000), and no demography estimates are available
- States/US Territories in which the Georgia pigtoe, is known to or is believed to occur: Alabama , Georgia , Tennessee
- US Counties in which the Georgia pigtoe, is known to or is believed to occur: View All
|Status||Date Listed||Lead Region||Where Listed|
|12/02/2010||Southeast Region (Region 4)|
» Federal Register Documents
|Date||Title||Plan Action Status||Plan Status|
|10/30/2014||Recovery Plan for Georgia pigtoe mussel (Pleurobema hanleyianum),interrupted rocksnail (Leptoxis foremani)and rough hornsnail (Pleurocera foremani)||Recovery efforts in progress, but no implementation information yet to display||Final|
|Date||Citation Page||Title||Document Type|
|07/03/2013||78 FR 40162 40163||Notice of Availability of a Technical/Agency Draft Recovery Plan for Georgia Pigtoe Mussel, Interrupted Rocksnail, and Rough Hornsnail||
|11/06/2014||79 FR 65982||Endangered and Threatened Wildlife and Plants; Final Recovery Plan for Georgia Pigtoe Mussel, Interrupted Rocksnail, and Rough Hornsnail||
» Critical Habitat
|Date||Citation Page||Title||Document Type||Status|
|11/02/2010||75 FR 67512 67550||Determination of Endangered Status for the Georgia Pigtoe Mussel, Interrupted Rocksnail, and Rough Hornsnail and Designation of Critical Habitat; Final Rule||Final Rule||Final designated|
|06/29/2009||74 FR 31114 31151||Proposed Endangered Status for the Georgia Pigtoe Mussel, Interrupted Rocksnail, and Rough Hornsnail with Critical Habitat||Proposed Rule||Not Required|
To learn more about critical habitat please see http://ecos.fws.gov/crithab
» Conservation Plans
No conservation plans have been created for Georgia pigtoe.
» Life History
Movement / Home Range
The only known populations of P. hanleyianum occur in the Conasauga River, Murray and Whitfield Cos., GA, and Coosa River (Weiss bypass), Cherokee Co., AL.
» Other Resources
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ITIS Reports -- ITIS (the Integrated Taxonomic Information System) is a source for authoritative taxonomic information on plants, animals, fungi, and microbes of North America and the world.
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