《Appendix 1 Additions and changes to the date matrix (Jia and Gao, 2016a) used in the phylogenetic a

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《河北围场下白垩统围场皇家螈(Regalerpeton weichangensis)(两栖类:有尾类)的再研究（英文）》

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In order to determine the phylogenetic position of Regalerpeton，it is added into the latest data matrix of caudates as show in Jia and Gao（2016a）.The character states of Jeholotriton were also added based on descriptions in Wang（2000），Wang and Rose（2005）and Carroll et al.（2012）.Some character states of Pangerpeton were modified by reexamination of the holotype（see Appendix 1）.Karaurus was the designated outgroup taxon，and all the characters were unordered and unweighted as in Jia and Gao（2016a）.