Invertebrate Collections include specimens from nearly every taxon of invertebrate animal. Major collections include, but are not limited to, mollusks and arthropods of the Cretaceous Western Interior, insects of the Western Interior Cenozoic, Cenozoic marine mollusks of the U.S. Gulf and Atlantic Coastal Plains as well as the Paris Basin, worldwide marine and freshwater Recent mollusks, and Gulf Coast Tertiary Foraminifera.