The authors named the genus Sinasaurus Zhou (2000) homonymum junius of Sinosaurus Young (1940), now named nomen substitutum Neosinasaurus Zhou (nom. nov.). The systematic study of Neosinasaurus and Xinpusaurus is presented as follows:;Class Reptilia Linnaeus, 1758; Subclass Diapsida Osborn, 1903; Order Sauropterygia Owen, 1860; Suborder Pachypleurosauroidea Huene, 1956; Family Neosinasauridae Zhou, nom. nov. 2000 Sinasauridae Zhou, in Yin, Zhou et al., pp.5～6.; Type genus Neosinasaurus Zhou, nom. nov.;Genus Neosinasaurus Zhou, nom. nov. 2000 Sinasaurus Zhou, in Yin, Zhou et al., pp.6.; Type species Neosinasaurus hoangi (Zhou); Neosinasaurus hoangi (Zhou) 2000 Sinasaurus hoangi Zhou, in Yin, Zhou et al., pp.6～8, pl. I, figs. 1～5; pl. Ⅱ, figs. 1, 3.;Suborder Thalattosauria; Family Thalattosauridae Merriam, 1905; Genus Xinpusaurus Yin, 2000 2000 Xinpusaurus Yin, in Yin, Zhou et al. pp.12～13.; Type species Xinpusaurus suni Yin, 2000; Xinpusaurus suni Yin, 2000 2000 Xinpusaurus suni Yin, in Yin, Zhou et al. pp.13～15; pl. Ⅶ, figs. 1～3; pl. Ⅷ, figs. 1～5.
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