Utterbackia imbecillis (Say, 1829)
Animalia | Mollusca | Bivalvia | Paleoheterodonta | Unionidae | Utterbackia | Utterbackia imbecillis
animal midden on sandy bank amidst roots of overturned tree
Mississippi River, about 2 mi. N of Savanna, IL, opposite of Palisades, about ri