Q Why is Archaeornithomimus sometimes regarded as a nomen dubium?

Q: Why is Archaeornithomimus sometimes regarded as a nomen dubium?

A.Its fossils are very fragmentary, making it difficult to distinguish it clearly from other dinosaurs B.Scientists know nothing about when or where it lived C.Its fossils are identical in every respect to those of birds

A Its fossils are very fragmentary, making it difficult to distinguish it clearly from other dinosaurs
B Scientists know nothing about when or where it lived
C Its fossils are identical in every respect to those of birds

Answer

A Its fossils are very fragmentary, making it difficult to distinguish it clearly from other dinosaurs

Only a limited number of fossils of Archaeornithomimus have been discovered, including leg bones and parts of the vertebral column.
As a result, there are not enough distinctive features to clearly distinguish it from other ornithomimids, leading some researchers to question whether it is a valid distinct taxon.

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