By Williston, Samuel Wendell, 1851-1918 . Genre Vertebrates, Fossil / Paleontology / Permian / Paleontology / United States . Names incertae sedis / american / vertebrates / reptilia / reptiles and 1739 more

By Olson, Everett Claire, 1910-1993 . Genre n-us-tx / Amphibians, Fossil / Paleontology / Permian / Paleontology and 1 more . Names trematops / sp / spigelia nov. / type / age and 39 more

By Olson, Everett Claire, 1910-1993 . Genre n-us-tx / Reptiles, Fossil / Paleontology / Texas / Paleontology and 1 more .

By Olson, Everett Claire, 1910-1993 . Genre n-us-tx / Paleontology / Texas / Paleontology / Permian and 1 more . Names vertebrates / area / delta / major / type and 323 more

By Schram, Frederick R., 1943- . Genre n-us-il / Trilobites / Illinois / Paleontology / Triassic and 4 more . Names merostomoidea / arthropod / telson / arthropoda / arthropods and 341 more

By Olson, Everett Claire, 1910-1993 . Genre n-us-tx / Reptiles, Fossil / Paleontology / Permian / Paleontology and 1 more . Names herbivores / daphnopsis grandis / diaspidiotus gigas / dileptus gigas / diophrys grandis and 66 more

By Williston, Samuel Wendell, 1852-1918 . Genre Vertebrates, Fossil / Paleontology / Permian / Paleontology / United States . Names incertae sedis / american / vertebrates / reptilia / reptiles and 1750 more

By Olson, Everett Claire, 1910-1993 . Genre n-us-tx / Diplocaulus / Paleontology / Permian / Paleontology and 1 more . Names us c / dinodontosaurus brevirostris / type / data / s 2 and 135 more

By De Mar, Robert Eugene, 1931- . Genre n-us-tx / Longiscitula houghae / Paleontology / Permian / Paleontology and 2 more . Names moon / trematops / broiliellus williston 1914 / fenestra / life and 53 more

By Olson, Everett Claire, 1910-1993 / Williams, Patricia M. . Genre n-us-ok / Vertebrates, Fossil / Paleontology / Oklahoma / Paleontology and 1 more . Names vertebrates / incertae sedis / reptile / sp / type and 1336 more