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Helveticosauridae is an
extinct family of
basal marine reptiles known from the
Middle Tri****ic (Anisian-Ladinian boundary) of
southern Switzerland and...
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Marmoretta as a stem-squamate. †Kuehneosauridae? †Choristodera? †
Helveticosauridae? †Cargninia †Coartaredens? †Feralisaurus? †Fraxinisaura †Lacertulus...
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Alexeyisaurus Atopodentatus Palatodonta? Pomolispondylus? Hanosaurus?
Helveticosauridae? Eusaurosphargis?
Helveticosaurus Saurosphargidae Hemilopas? Largocephalosaurus...
- Superorder: †Sauropterygia Owen, 1860
Subgroups †Atopodentatus †Hanosaurus †
Helveticosauridae? †Placodontiformes †Saurosphargidae †Eosauropterygia †Nothosauria...
- †Prolacertoides †Choristodera? †Kuehneosauridae? †Drepanosauridae? †
Helveticosauridae? †Ichthyosauromorpha? †Protorosauria (likely paraphyletic) †Tanysauria...
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Alexeyisaurus Atopodentatus Palatodonta? Pomolispondylus? Hanosaurus?
Helveticosauridae? Eusaurosphargis?
Helveticosaurus Saurosphargidae Hemilopas? Largocephalosaurus...
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Alexeyisaurus Atopodentatus Palatodonta? Pomolispondylus? Hanosaurus?
Helveticosauridae? Eusaurosphargis?
Helveticosaurus Saurosphargidae Hemilopas? Largocephalosaurus...
- †Sophineta †Tamaulipasaurus †Taytalura †Vellbergia †Vinitasaura †
Helveticosauridae? †Kuehneosauridae? †Saurosphargidae? †Thalattosauria? †Sauropterygia...
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Alexeyisaurus Atopodentatus Palatodonta? Pomolispondylus? Hanosaurus?
Helveticosauridae? Eusaurosphargis?
Helveticosaurus Saurosphargidae Hemilopas? Largocephalosaurus...
- †Sophineta †Tamaulipasaurus †Taytalura †Vellbergia †Vinitasaura †
Helveticosauridae? †Kuehneosauridae? †Saurosphargidae? †Thalattosauria? †Sauropterygia...
