Quadrula fragosa


Taxonomy [top]

Kingdom Phylum Class Order Family

Scientific Name: Quadrula fragosa
Species Authority: Conrad, 1835
Common Name(s):
English Rough Maple Leaf Pearly Mussel, Winged Mapleleaf

Assessment Information [top]

Red List Category & Criteria: Critically Endangered A1c ver 2.3
Year Published: 1996
Date Assessed: 1996-08-01
Needs updating
Assessor(s): Bogan, A.E. & Seddon, M.B. (Mollusc Specialist Group)

Geographic Range [top]

Range Description: The single known remnant population exists in a 20 km stretch of the lower St. Croix River between Minnesota and Wisconsin.
United States (Arkansas - Regionally Extinct, Kentucky - Regionally Extinct, Minnesota, Tennessee - Regionally Extinct, Wisconsin)
Range Map: Click here to open the map viewer and explore range.

Habitat and Ecology [top]

Systems: Freshwater

Conservation Actions [top]

Conservation Actions: Is listed as a federally endangered species in the U.S. The St. Croix River is a National Wild and Scenic River and this designation confers some protection from anthropogenic disturbance of the population.

Citation: Bogan, A.E. & Seddon, M.B. (Mollusc Specialist Group) 1996. Quadrula fragosa. The IUCN Red List of Threatened Species. Version 2015.2. <>. Downloaded on 28 August 2015.
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