Pliocene. Bivalves are the second most diverse group of molluscs behind gastropods. They are one of the most important members of most marine and freshwater ecosystems. There are well over 10,000 described species of bivalve alive today.
UT Department of Environmental Sciences
The University of Toledo
Digital Initiatives, University of Toledo Libraries
environmental sciences; virtual exhibitions
"Phylum Mollusca, Class Bivalvia" (2017). Rock and Mineral Exhibit. 104.