| 中国东北辽西中侏罗世达尔文翼龙新标本 |
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| A New Specimen of Darwinopterus from the Middle Jurassic of Western Liaoning, Northeastern China |
| Traditionally, pterosaurs are classified in two groups: a paraphyletic grade of basal forms (‘rhamphorhynchoids’) and the monophyletic, derived pterodactyloids (Wellnhofer 1991). Members of the basal group are characterized by a short skull, short neck with cervical ribs, short metacarpals and long tail while the derived group is characterized by a long skull, a long neck lacking cervical ribs, long metacarpals and short tails (with the exception of anurognathids – a clade of non-pterodactyloids with a pterodactyloid-like short tail). Pterodactyloids are thought to have evolved from rhamphorhynchoid pterosaurs (Wellenhofer 1991), but there was no fossil evidence to confirm the transition in skull and tail morphology between these two groups until the recent discovery of Darwinopterus modularis from the Middle Jurassic Tiaojishan Formation of Jianchang, western Liaoning in northeastern China (Lü et al. 2010). |
| Xu Li,Lü Jun-chang,CHANG Hua-li,WEI Xue-fang,ZHANG Xing-liao,JIA Song-hai,ZHANG Ji-ming.2010.A New Specimen of Darwinopterus from the Middle Jurassic of Western Liaoning, Northeastern China[J].Acta Geoscientica Sinica,31(S1):82. |
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