caption: The image shows four different types of freshwater mussels on a black background, with the text "anodon lineata heude, 1879 USNM 126446" at the top. The mussels are arranged in a symmetrical pattern, with each one having a unique shape and texture. The colors of the mussels range from light to dark, with some having a glossy sheen and others having a matte finish. The text is written in a bold, white font, making it stand out against the dark background.