LRP - Licenses

LRP - Regulations

LRP - Permits

Recreation - Statewide

Recreation - Trapping

Recreation - Fishing

Recreation - Hunting

Env. Protection - Management

Env. Protection - Emergency

Env. Protection - Resources

To sign up for updates or to access your subscriber preferences, please enter your contact information below.



 
Share your observations

Share your observations of plants or non-game animals with the Natural Heritage Inventory.

Rare animals
Find rare and non-game animals.
Rare plants
Learn about plants on the Natural Heritage Working List.
Rare lichens
Discover Wisconsin's lichens.
Natural communities
Explore Wisconsin's natural communities.
Other features
Discover unique resources.
Eagle license plate

Help care for rare plants and animals by ordering an Endangered Resources plate.

Contact information
For information on Wisconsin's rare animals, contact:
Rich Staffen
Conservation Biologist
608-266-4340

Winged Mapleleaf (Quadrula fragosa)


Overview

Overview

Winged mapleleaf (Quadrula fragosa), a mussel listed as Endangered at the Federal and State level, is found in large and medium-sized rivers in the Mississippi River drainage. It is found in mixed gravel and sand in riffles or fast-flowing water. It is very rare wherever it is found. The known host fish are blue and channel catfish.

State status

Status and Natural Heritage Inventory documented occurrences in Wisconsin

The table below provides information about the protected status - both state and federal - and the rank (S and G Ranks) for Winged Mapleleaf (Quadrula fragosa). See the Working List Key for more information about abbreviations. Counties shaded blue have documented occurrences for this species in the Wisconsin Natural Heritage Inventory database. The map is provided as a general reference of where occurrences of this species meet NHI data standards and is not meant as a comprehensive map of all observations.

Note: Species recently added to the NHI Working List may temporarily have blank occurrence maps.


Documented locations of Quadrula fragosa in the Natural Heritage Inventory Database as of July 2015.
Summary Information
State StatusEND
Federal Status in WisconsinLE
State RankS1
Global RankG1
Tracked by NHIY
WWAP SGCN

Species guidance


Winged Mapleleaf (Quadrula fragosa) has very few known occurrences in the state and is of the highest priority for conservation; we encourage you to consult with your District Ecologist or an NHI Zoologist for specific recommendations for your site.

Note: a species guidance document is not available at this time. Information below was compiled from publication PUB-ER-085-99 (now out-of-print).

Identification: Shell is square, thick, and yellowish-green to light brown with faint rays in smaller shells, becoming greenish-brown or dark brown in larger individuals. A pronounced wing is present posterior to the umbo with radiating rows of ridges. The beak sculpture has two rows of raised nodules that continue down the surface of the shell separated by a furrow. Anterior and posterior ends are squared or truncated. Pseudocardinal teeth are well developed and serrated. Laterals are long. Striated, and straight. The nacre is pearly white, iridescent posteriorly, Up to 4 inches (10.2 cm) long.

Habitat: Occurs in large rivers on a mixed sand and gravel bottom in water two meters or more in depth.

State Distribution: Occurs only in the St. Croix River.

Phenology: The host fish for this species are likely catfish, although this has yet to be proven. Gravid mussels have been found late September to early October.

Management Guidelines: Habitat destruction and river pollution have resulted in mussel declines. Protection of habitat and improvements in water quality along with restriction of dredging, impoundments, sand and gravel mining, and navigational improvements would benefit this species. The development of fish runways to facilitate the movement of host species through or around dams could also help to protect the winged mapleleaf. The U.S. Fish and Wildlife Service has developed a recovery plan for this species.

Photos/Video

Photos


Winged Mapleleaf

The winged mapleleaf is a globally rare mussel that is now listed as Endangered by both state and federal governments. A significant population of this imperiled species inhabits the Lower St. Croix River.

Photo by Lisie Kitchell, WDNR.


Last revised: Thursday, May 04, 2017