The Dwarf Wedge Mussel (Alasmidonta heterodon) is a small freshwater mussel. They rarely grow bigger than 1.5 inches (38mm) in length and are brownish or yellowish brown in color. Adult mussels filter their food, feeding on algae and other small floating particles. Once settled they rarely move, spending most of their time buried in the bottom of streams and rivers. They like slow to moderate running water over cobble, fine gravel, firm silt or sandy bottoms. They can also be found amongst submerged aquatic plants, near stream banks, or underneath overhanging tree limbs.

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