caption: The image shows four different types of clams on a black background, with the text "Nucula Polynesica Rehder, 1980" at the top. The clams are arranged in a symmetrical pattern, with each one having a unique shape and size. The colors of the clams range from light to dark, with some having a glossy finish. The text is written in a bold, white font, making it stand out against the dark background.