Macelognathus was a unknown. It lived in the Late Jurassic period and inhabited North America. Its fossils have been found in places such as Wyoming (United States) and Colorado (United States).

All the Macelognathus illustrations below were collected from the internet. Enjoy and explore:

Macelognathus was described by the following scientific paper(s):
  • G. Callison and H. M. Quimby. 1984. Tiny dinosaurs: are they fully grown?. Journal of Vertebrate Paleontology 3(4):200-209
  • O. C. Marsh. 1881. Discovery of a fossil bird in the Jurassic of Wyoming. American Journal of Science 31:341-342
  • Anonymous. 1977. The Fruita Paleontological Report. Grand Junction, Colorado: Bureau of Land Management.