The specimen pictured below was collected on June 8, 2000 from the Bourbeuse River, in Franklin Co. MO.  It resembles the federally endangered winged mapleleaf, Quadrula fragosa.  Currently Q. fragosa is confirmed to occur only in the St. Croix River in Wisconsin (USFWS), and possibly the Ouachita River in Arkansas (John Harris, personal communication).  

Click on the thumbnails for larger images  (~56K@).
frag-r.jpg (70619 bytes) Dscn0178.jpg (49324 bytes) frag-l.jpg (75385 bytes)
Dscn0176.jpg (40646 bytes) Dscn0175.jpg (41966 bytes) Dscn0179.jpg (69676 bytes)
Dscn0180.jpg (81137 bytes) Dscn0182.jpg (32497 bytes) Dscn0183.jpg (35258 bytes)

 

Mapleleafs, Quadrula quadrula, for comparison.  A highly plastic species!
maple-3.jpg (23347 bytes) fall-1a.jpg (54219 bytes) nebraska-1a.jpg (32515 bytes)
maple-2.jpg (22244 bytes) fall-1b.jpg (39035 bytes) nebraska-1b.jpg (31269 bytes)
Fall River near Neodesha, Kansas. Fall River near Neodesha, Kansas. Reservoir in eastern Nebraska
meramec-2a.jpg (43376 bytes) meramec-1a.jpg (46189 bytes) image1.jpg (44201 bytes)
meramec-2b.jpg (38459 bytes) meramec-1b.jpg (34571 bytes) Bourbeuse-1b.jpg (35424 bytes)
Meramec River, Missouri Meramec River, Missouri The Bourbeuse River "winged" specimen

 

Other pictures of winged mapleleaf, and related links.
fragosa_Verd_KS.jpg (44107 bytes) fragosa_Neosho_KS.jpg (81847 bytes) coker2.jpg (44223 bytes)
Ohio River. Coker, R. E.  1919.  Bull. U.S. Bur. Fish. 36.  
Verdigris River, KS (subfossil) Neosho River, Kansas (subfossil)
inhsqfrag.jpg (13914 bytes) usfwsqfrag.jpg (10045 bytes)

wpe3.jpg (16428 bytes)
Illinois Natural History Survey U. S. Fish and Wildlife Service

Wisconsin DNR

 

Range extension in the upper St. Croix- link to abstract by Mark Hove et al.

Federal Recovery Plan for winged mapleleaf (Adobe PDF file)

Historical presence in Kansas- link to abstract by Dan Bleam, Charles Cope, Karen Couch, and Don Distler

Rediscovery of lost species - discussion thread on Conch-L regarding Marian Havlik's discovery of the St. Croix population.