This is a good place to mention some fossils that have been thought to be predatory dinosaurs, but probably are not. ( Realistic dinosaur costume) Most are fragmentary to greater or lesser degrees. Among the more notorious of these are the alleged “predatory prosauropods” of the Late Triassic, of which Teratosaurus Meyer, 1861 is the best known. They are sometimes believed to combine blade-toothed jaws with stocky prosauropod-like bodies, the prosauropods having been the most primitive of the herbivorous dinosaurs. (Walking dinosaur costume)But closer investigation invariably shows that these are the skeletons of herbivorous prosauropod dinosaurs, mixed in with the teeth and skull parts of predatory thecodonts or dinosaurs. What often happened is that predatory thecodonts or dinosaurs shed some of their teeth while they were killing or feeding on a herbivore. Or, in the case of Terotosourus, the skull bones turned out to be those of a big rauisuchid thecodont.2 Never has a predatory skull actually been found attached to a prosauropod neck, nor will one ever be since a bulky herbivore’s body is wholly unsuitable for a hunter. (Animatronic dinosaur for sale)The worst of these mix-ups are claims that some of the early giant brontosaurs had predatory heads. The supposed “predatory prosauropods” were often called paleopods, but since they never really existed the title is best dropped. In a related case, Late Triassic Lukousourus Young, 1948 is often considered a theropod, but the snout is more likely that of a thecodont or early crocodilian. It is too poorly preserved and incomplete to tell for sure.
It was recently contended that the new and strange segnosaurian dinosaurs from Late Cretaceous Mongolia were abemant herbivorous theropods. (animatronic dinosaur)Their four-toed feet alone show that this cannot be conect. The finds also included an excellent skull. and when I saw it I knew immediately that these were not predatory dinosaurs at all. Instead, they were late-surviving ornithischianlike prosauropods.3 The story mlght not end here. A big arm with incredibly long claws from Late Cretaceous Mongolia is named Therbinoscurus Maleev, 1954. Believed to be theropodian, the shoulder girdle and humerus are similar to segnosaurs’and may be segnosaurian. Some other segnosaur-like humeri assigned to theropods, such as that of Alecfroscurus, are more likely to be segnosaurs too.
At the small end of the size scale is little Awpes Huene, 1932 of Middle Triassic Europe. Based on three cannon bones, it is sometimes considered the first theropod. But it is too fragmentary for us to tell.
Then there is Pclceornrs Emmons, 1857 from the Late Triassic of North Carolina. For over a hundred vears it has been cited as a dubious set of bird or theropod hip vertebrae. It turns out that it is really a piece from the snout of a crocodile-like theco-dont called a phytosaur.