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  • Title: A two-headed reptile from the Cretaceous of China.
    Author: Buffetaut E, Li J, Tong H, Zhang H.
    Journal: Biol Lett; 2007 Feb 22; 3(1):80-1. PubMed ID: 17443971.
    Abstract:
    A malformed embryonic or neonate choristoderan reptile from the Lower Cretaceous Yixian Formation of northeastern China is described. The tiny skeleton exhibits two heads and two necks, with bifurcation at the level of the pectoral girdle. In a fossil, this is the first occurrence of the malformation known as axial bifurcation, which is well known in living reptiles.
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