Ellipsaria lineolata (Rafinesque, 1820)
Click to enlarge
Basis for Listing
Somewhat triangular, valves thick; males are compressed, females are modestly inflated; dorsal margin curved, beaks turned forward, anterior and ventral margin evenly rounded, bluntly pointed posterior; posterior ridge sharply angled dorsally; periostracum yellow, brown in old specimens, with numerous interrupted brown rays; hinge ligament sometimes dark green. Beak sculpture: a few fine double-looped lines, usually obscure. Pseudocardinal and lateral teeth well developed, nacre white. Length: up to 5 inches. No similar species in Minnesota.
Found in large rivers, often in coarse substrate and flowing water. Extirpated from the Minnesota River, and uncommon to rare in the Mississippi River below St. Anthony falls. Largest remaining populations are in the lower St. Croix River, where it is locally common but rarely abundant
Biology / Life History
Conservation / Management
Conservation Efforts in Minnesota