In 2011, a new paravian from Late Jurassic China was named: Xiaotingia ("of Zheng Xiaoting"). Dromaeosaurids and troodontids formed Deinonychosauria, which, along with the birds, formed Eumaniraptora ("true maniraptorans") together with some more primitive forms, eumaniraptorans formed Paraves ("close to birds"). For a long time, things seemed pretty simple: Archaeopteryx was a primitive bird (or, more properly, avialan). There are many dinosaur groups whose interrelationships are uncertain, but none are as confused as the early birds and their relatives.
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