Molecular backbone constraints have been used previously to incorporate fossils within a molecular hypothesis in a number of different groups (e.g., snakes [63], turtles [64], old world monkeys [65], and leafy liverwort [66]), but this has never been performed before on cartilaginous fish....
1. Introduction Angiosperms are the most diversified and widely distributed plant group in the cur- rent world. However, the origin and early history of angiosperms are poorly understood and controversial. Although paleobotanists have investigated much effort and applied various technologies to decipher ...