77
Threeridge, Amblema plicata
Missouri River, Cedar County, 74mm
South Fork Big Nemaha River,
Richardson County, 125mm, dorsal
view
South Fork Big Nemaha River,
Richardson County, 125mm, anterior
view
Missouri River, Cedar County, 25mm
juvenile
Missouri River, Cedar
County, 74mm, beak
sculpture
Cross section of Threeridge, 112mm, anterior end is to the right