Infraclass
Archosauromorpha Huene, 1946
Archosaurs and their relatives, one of the two major diapsid clades
Order Protorosauria Lydekker, 1888
a varied and paraphyletic assemblage of small to large, lizard-like reptiles, Late Perm to Late Trias, cosmopolitan
Family Protorosauridae Lydekker, 1888
(ancestral archosauromorphs, semiaquatic - Late Perm to Early Trias of Eur)
Family
Prolacertidae Parrington, 1935
(paraphyletic assemblage or watsebasket taxon of medium-long necked lizard-like forms, faculatively bipedal Early to Late Trias, Cosm)
Family Tanystropheidae Gervais, 1858
long necked, mostly semi-aquatic forms, may be several parallel or only distantly related protorosaurs, Mid to Late Trias, Eur, N Am, & China
Subfamily Macrocneminae Kuhn, 1946 -
shorter neck, may be a distinct family but here re-ranked as subfamily. Monotypal, Mid Trias of Eur
Subfamily Dinocephalosaurinae (informal)
informal monotypal subfamily for Dinocephalosaurus orientalis - many neck vertebrae - Mid Trias of China
Subfamily Tanystropheinae -
here used for specialised long-necked forms, length to 6 meters (mostly neck), Mid to Late Trias, Eur & N Am
Family
Drepanosauridae Berman and Reisz 1992 (= Drepanosauromorpha Renesto et al., 2010)
small, aboreal, chameleon-like forms, Late Trias, Eur & N Am
Order Helveticosauria Peyer, 1955
(monotypal)
Family
Helveticosauridae Peyer, 1955
(bizarre aquatic forms, Mid Trias of Eur)
Order
Trilophosauria Romer 1956
Family Variodentidae Tatarinov, 1964
(monotypal, small lizard-like archosaurs with procolophon-like dentition, Variodens inopinatus, Late Trias of Eur)
Family Trilophosauridae Gregory, 1945
(monotypal, large lizard-like herbivores, Trilophosaurus, Late Trias of N Am)
Order
Rhynchosauria Osborn, 1903
(herbivores with efficient curtting and grinding teeth, four subfamilies constitute a progressive evolutionary series Trias, Cosm.)
Family Rhynchosauridae Huxley, 1887
(only family in order; alternatively the four subfamilies could each be considered a family, although that may be excessive taxonomic inflation)
Subfamily Mesosuchinae Haughton, 1924
(lizard-like basal forms - Early to Early Mid Trias, Sth Afr)
Subfamily Howesiiane Watson, 1917
(monotypal lizard-like primitive form - Howesia browni - Earliy Mid Trias of Sth Afr)
Subfamily Rhynchosaurinae Cope, 1870 (= Family: Stenaulorhynchidae, Kuhn, 1933) -
intermediate forms, typical rhynchosaurs - Mid Trias of Eur & Afr
Subfamily Hyperodapedontinae Lydekker, 1885; (= Family: Hyperodapedontidae Lydekker, 1885 = Family: Paradapedontidae Huene, 1938)
advanced and abundant large (1.5 m) rhynchosaurs with wide skulls and complex dentition, Late Trias, Cosmpol