Editing Microraptor (section)

===Distinguishing anatomical features===
A diagnosis is a statement of the anatomical features of an organism (or group) that collectively distinguish it from all other organisms. Some, but not all, of the features in a diagnosis are also autapomorphies. An autapomorphy is a distinctive anatomical feature that is unique to a given organism. Several anatomical features found in ''Microraptor'', such as a combination of unserrated and partially serrated teeth with constricted 'waists', and unusually long upper arm bones, are shared with both primitive avians and primitive [[Troodontidae|troodontids]]. ''Microraptor'' is particularly similar to the basal troodontid ''[[Sinovenator]]''; in their 2002 description of two ''M. zhaoianus'' specimens, Hwang ''et al.'' note that this is not particularly surprising, given that both ''Microraptor'' and ''Sinovenator'' are very primitive members of two closely related groups, and both are close to the [[Dromaeosauridae|deinonychosaurian]] split between dromaeosaurids and troodontids.<ref name="hwangetal2002">Hwang, S.H., Norell, M.A., Ji, Q., and Gao, K. (2002). "New Specimens of ''Microraptor zhaoianus'' (Theropoda: Dromaeosauridae) from Northeastern China." ''American Museum Novitates'', 3381: 44pp.</ref>