Marshosaurus bicentesimus is a midsize theropod in the Morrison Formation in the Megalosauridae family. Over the past few years, teeth are becoming available in the open market simply because dealers/diggers are now more aware of this species and like to sell them.  Isolated teeth from the Morrison Formation are very difficult to diagnose because of their similarity and all require an understanding of additional characteristics than normal, in hopes of properly identifying them.   The best I can