Five damaged partial tooth crowns (AMNH 5780) mistakenly thought to have belonged to the "L. trihedrodon" holotype share many features in common with "Allosaurus" and probably belong to that genus. However some of the "Allosaurus"-like characters of the teeth are primitive to theropods as a whole and may have been present in other large-bodied Morrison Formation theropod species. ""Laelaps" macropus" was coined by Cope for a partial hind limb found in the Navesink Formation that Joseph Leidy had referred earlier to the ornithomimid "Coelosaurus", distinguishing it from "Dryptosaurus" by its longer toes. Thomas R. Holtz listed it as an indeterminate tyrannosauroid in his contribution to the second edition of the "Dinosauria". In 2017, it was given the new generic name "Teihivenator". A forthcoming research paper opines that the remains of "Laelaps macropus" are a mixture of non-diagnostic tyrannosauroid and ornithomimid elements, rendering the species a "nomen dubium". Since the time of its discovery, "Dryptosaurus" has been classified in a number of theropod families. Cope (1866), Leidy (1868) and Lydekker (1888) noted obvious similarities with the genus "Megalosaurus" which was known at the time from remains discovered in southeastern England. Based on this line of reasoning, Cope classified it as a megalosaurid. Marsh, however, examined the remains and later assigned to its own monotypic family, Dryptosauridae. The fossil material assigned to "Dryptosaurus" was reviewed by Ken Carpenter in 1997 in light of the many different theropods discovered since Cope's day. He felt that due to some unusual features it couldn't be placed in any existing family, and like Marsh, felt that it warranted placement in Dryptosauridae. This phylogenetic assignment was also supported by the work of Russell (1970) and Molnar (1990). Other phylogenetic studies during the 1990s suggested that "Dryptosaurus" was a coelurosaur, though its exact placement within that group remained uncertain. In 1946, Charles W. Gilmore was the first to observe that certain anatomical features may link "Dryptosaurus" with coeval Late Cretaceous tyrannosaurids, "Albertosaurus" and "Tyrannosaurus".