The Asiatic clam is indigenous in temperate to tropical southern Asia and east to the Mediterranean, southeast Asian islands, eastern and central Australia, and Africa, except in the Sahara desert. It has spread to 40 states in the United States and is most prevalent in Indiana. This freshwater bivalve mollusk with distinct concentric rows of elevated ridges on the shells. The shell is rounded to slightly triangular. The exterior is usually brown in color but can vary to a yellowish-gold. The nacre, or interior of the shell, is usually white to light purple. The average adult size is rarely larger than 1.5 inches.
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