其中三种态模标本可能是在石树沟组已知的兽脚类恐龙，即阿瓦拉慈龙类（alvarezsauroid）的简手龙（Haplocheirus）和基础坚尾龙类（tetanurans）的单嵴龙（Monolophosaurus）和中华盗龙（Sinraptor）。
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Haplocheirus sollers 灵巧简手龙
"Haplocheirus is a transitional fossil, " Jonah Choiniere from George Washington University told the BBC.
BBC: New dinosaur discovery solves evolutionary bird puzzle
Haplocheirus sollers may not be as charismatic as T. rex or as agile as a pterodactyl but it's thought to solve a long standing puzzle.
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