a 1940 expedition by the american museum of natural history yielded more fossils of giant crocodilians, this time from big bend national park in texas. these specimens were described by edwin h. colbert and roland t. bird in 1954, under the name "phobosuchus riograndensis". donald baird and jack horner later assigned the big bend remains to "deinosuchus", which has been accepted by most modern authorities. the genus name "phobosuchus", which was initially created by baron franz nopcsa in 1924, has since been discarded because it contained a variety of different crocodilian species that turned out to not be closely related to each other.