Schram, F. R. (Department of Zoology, Eastern Illinois University, Charleston, Illinois 61920) 1977. Paleozoogeography of Late Paleozoic and Triassic Malacostraca. Syst. Zool. 26:367-379.-Paleozoogeographic patterns of Late Paleozoic through Triassic marine and freshwater malacostracans, interpreted in light of Croizat's vicariance model of biogeography, lend significant insights into the distribution of living malacostracans, as well as events in the Late Paleozoic and early Mesozoic radiation of these crustaceans. The Hoplocarida and Eumalacostraca had a tropical Laurentian range which became well established by Late Carboniferous time. With the suturing of the supercontinent Pangaea in the Permian, the former Laurentian marine crustaceans appear to have spread into the nearshore and freshwater habitats of Gondwana and Angara. By the late Perrmian and Early Triassic a decapod eumalacostracan fauna became established in tropical and subtropical regions of Pangaean marine habitats, while the Late Paleozoic hoplocaridan and eumalacostracan fauna became extinct or was restricted to geographic and ecologic refugia (which in contemporary terms is largely expressed as a Gondwana and deep-sea distribution). [Malacostraca; paleozoogeography; vi-