The Psittacosauridae were a group of ceratopsian dinosaurs, which lived between 140.2 and 99.6 million years ago. The family Psittacosauridae was first named by American paleontologist Henry Fairfield Osborn in 1923. The first exact definition as a clade was in 2005 by Paul Sereno: the stemclade consisting of Psittacosaurus mongoliensis, Osborn 19...
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http://en.wikipedia.org/wiki/Psittacosauridae
(from the article `ceratopsian`) The ceratopsians comprise three lineages (see images). Members of the Psittacosauridae, including Psittacosaurus, were mostly bipedal and lived ... The Ceratopsia are divided into groups that mirror their evolutionary trends through time: the primitive psittacosaurids, such as Psittacosaurus; the ... ...
Found on
http://www.britannica.com/eb/a-z/p/127
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