caption: The image shows a group of three different types of oysters on a black background, with the text "Unio Spurius Heude, 1877 USNM 126457" at the top. The oysters are arranged in a symmetrical pattern, with one oyster in the center and two on either side. The shells are a light brown color with a glossy sheen, and the text is written in a bold, white font.