than coastal species, and tend to have less of an ability to cross bodies of water. Further, Early Cretaceous titanosaurs are already known, so North American potential ancestors for Alamosaurus already existed. Contemporaries of Alamosaurus in the American southwest include unidentified tyrannosaurids similar to Tyrannosaurus, the oviraptorosaur Ojoraptorsaurus, the hadrosaurid Kritosaurus, the armored nodosaur Glyptodontopelta and the chasmosaurine ceratopsids cf. Torosaurus utahensis, Bravoceratops, and Ojoceratops. Non-dinosaur taxa that had shared the same environment with Alamosaurus include the giant pterosaur Quetzalcoatlus, various species of fishes and rays, amphibians, lizards, turtles like Adocus, and multiple species of multituberculates like Cimexomys and Mesodma. References Notes Late Cretaceous dinosaurs of North America Saltasaurids Natural history of San Juan County, New Mexico Fossil taxa described in 1922 Taxa named by Charles W. Gilmore Paleontology in New Mexico Paleontology in Utah Paleontology in Texas Ojo Alamo Formation Maastrichtian genus first appearances Maastrichtian genus extinctions