Bryozoans are tiny aquatic animals whose fossils are among the most common globally, especially in North America, where they can form entire limestone beds. With nearly 6,000 living species and over 15,000 extinct ones dating back 480 million years, they form colonies of hermaphroditic clones called zooids. These zooids build coral-like calcium carbonate structures. This fossil is a branch of such a structure—each small pit once housed a zooid that fed on microscopic organisms. One Bryozoan fossil displayed in an acrylic case. A perfect addition for your fossil collection. The images are representative of the specimen you will receive. Larger specimens will be prioritized first. Please expect some natural variation. Includes a detailed info card.