caption: The image shows two small shells, an arca and anadara, on a black surface next to a piece of paper with text written on it. The arca shell is a light brown color with a smooth, glossy texture, while the anadar shell is slightly darker brown with a slightly curved shape. Both shells have a glossy sheen and are resting on a flat surface. The paper beneath them has text written in a cursive font, likely providing information about the shells.