In pterosaurs a greatly elongated fourth finger of each forelimb supported a winglike membrane.The other fingers were short and reptilian, with sharpclaws.

• 翼龙每个前肢的大大延长的第四指支撑一个翅膀状的薄膜，其它指头小，而且是典型的爬行动物式，有尖爪。