However these are, as they state, almost certainly plesiomorphic. Thus, it may not be wise to recognize a separate family at this point based on a diagnosis which will almost certainly take in a paraphyletic group of stem therizinosauroids. Total mass perhaps 20 kg.
Parentheses indicate reconstructions based upon scanty evidence.
The membership of this group, as well as its characteristics, is fairly unclear. No authority supports the trichotomy used here as the sister of Paraves. This is simply a compromise between a number of possible arrangements. Several specimens found on nests with eggs, now believed to be their own. Possible herbivores, and general form converges on prosauropods.