caption: The image shows a group of four oysters on a black background with the words "Yoldia Yoldiella Dicella Dall, 1908" written at the top. The oysters are arranged in a symmetrical pattern, with the largest oyster in the center and two smaller oysters surrounding it. The shells are a light brown color and have a glossy sheen. The background is a deep black color, providing a stark contrast to the oysters and shells.