Pistosauroidea Temporal range:Early Triassic-Late Cretaceous,251–66 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Life restoration ofAugustasaurus hagdorni
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Superorder:	†Sauropterygia
Clade:	†Eosauropterygia
Clade:	†Pistosauroidea Baur, 1887-90
Subgroups
†Chinchenia †Corosaurus †Cymatosaurus †Kwangsisaurus †Wangosaurus †Pistosauria †Augustasaurus †Bobosaurus †Pistosaurus †Yunguisaurus †Plesiosauria

Pistosauroidea is a group ofmarine reptiles within thesuperorderSauropterygia that first appeared in the latter part of theEarly Triassic and were the ancestors ofplesiosaurs. Pistosauroids are rare in Triassic marine assemblages, and are represented by only a few fossils from centralEurope, theUnited States, andChina.^[1] Recent phylogenetic analyses consider the Triassic pistosauroids to be aparaphyletic grouping, meaning that they do not form a trueclade.Plesiosauria is now placed within Pistosauroidea, while the traditional pistosauroids are successively morebasal, or primitive, sauropterygians.^[2]

Below is acladogram of pistosauroid relationships from Chenget al. (2006):^[1]

Below is a cladogram of pistosauroid relationships from Ketchum & Benson, 2011:^[3]

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