Primitive reptiles in Diapsida (Phylogenetic tree) - Animals in the Fossil sites, and Biodiversity

Classified animal picture guide. Highlighting the link of species shows the images, and clicking the link shows Evolutionary Tree.

• Kingdom Animalia
  • Phylum Chordate
    • Subphylum Vertebra
      • Infraphylum Gnathostomata (Jawed vertebrates)
        • Class Amphibia
          • Superorder Reptiliomorpha (Reptile-like amphibia; 318.1～272.5 Mya)

            Primitive amniota

            Westlothiana   (336～332.9 Mya; Primitive amniotes), Casineria   (339.4～336 Mya; Primitive amniotes), Eogyrinus   (318.1～299 Mya), Diplovertebron   (311.7～306.5 Mya), Diadectes   (290～272.5 Mya; Ancestors of amniotes), Seymouria   (284～272.5 Mya; Many reptilian features)

        • Class Synapsida (Mammal-like reptiles)
        • Class Sauropsida (Non mammal-like reptiles)
          • Subclass Anapsida (No arch near the temples)
          • Subclass Diapsida (Two arches near the temples)
            • Order Araeoscelidia (Small reptiles; 305～272.5 Mya)

              Primitive reptile

              Petrolacosaurus   (305～302 Mya), Araeoscelis (284～272.5 Mya)

            • Order Avicephala (Small reptiles)

              Primitive reptile

              Coelurosauravus   (258-251 Mya; Wing-like glider), Longisquama   (230～225 Mya; Long structures of back), Hypuronector   (228～216.5 Mya), Drepanosaurus   (216.5～203.6 Mya), Megalancosaurus   (216.5～203.6 Mya)

            • Order Thalattosauria (Marine reptile; 237～216.5 Mya)

              Marine reptile

              Askeptosaurus (235～225 Mya), Thalattosaurus (228～216.5 Mya), Endennasaurus (216.5～203.6 Mya)

            • Order Younginiformes (Marine reptile; 260.5～249.7 Mya)

              Marine reptile

              Thadeosaurus (254～251 Mya), Hovasaurus   (251～249.7 Mya), Younginia (250 Mya)

            • Infraclass Ichthyopterygia

              Marine reptile

              Grippia (251～199.6 Mya), Utatsusaurus (249.7～245 Mya)

              • Order Ichthyosauria (Large marine reptiles; 249.7～65.5 Mya)

                Marine reptile

                Cymbospondylus   (249.7～228 Mya), Mixosaurus   (245～237 Mya), Shonisaurus   (228～203.6 Mya; ２１m), Ichthyosaurus   (216.5～112 Mya; Great Dying④), Ophthalmosaurus   (199.6～150.8 Mya), Eurhinosaurus   (196–175 Mya), Excalibosaurus   (196.5～189.6 Mya), Stenopterygius   (183～175.6 Mya)

            • Infraclass Lepidosauromorpha (Lizards, Snakes, Tuatara)
              • Order Eolacertilia (Ancestors of snakes and lizards)

                Ancestors of snake,lizard

                Paliguana   (251～245 Mya; Earliest Lepidosauromorpha), Icarosaurus   (228～216.5 Mya; Wing-like glider), Kuehneosaurus   (216.5～199.6 Mya; Wing-like glider)

              • Superorder Sauropterygia (Marine reptiles with flippers)
                • Order Placodontia (Marine reptiles with ablet teeth; 245～199.6 Mya)

                  Marine reptile

                  Placodus   (249.7～228 Mya), Henodus   (228–220 Mya; Back like turtle), Psephoderma   (216.5～199.6 Mya; Back like turtle)

                • Order Nothosauroidea (Marine reptile; 251～245 Mya)

                  Marine reptile

                  Nothosaurus   (245～216.5 Mya), Ceresiosaurus   (245～237 Mya), Keichousaurus   (245～237 Mya), Pachypleurosaurus   (245～228 Mya)

                • Order Plesiosauria (Marine reptile)
                  • Suborder Plesiosauroidea (Long-necked plesiosaurs; 216.5～65.5 Mya)

                    Marine reptile

                    Plesiosaurus   (203.6～85.8 Mya; Great Dying④), Hydrorion   (183.7～175.6 Mya), Bishanopliosaurus   (183～175.6 Mya), Cryptoclidus   (164.7～155.7 Mya), Muraenosaurus   (164.7～161.2 Mya), Thalassomedon   (99.6～70.6 Mya), Elasmosaurus   (93.5～70.6 Mya), Futabasaurus   (85.8～83.5 Mya), Dolichorhynchops   (83.5～70.6 Mya)

                  • Suborder Pliosauroidea (Short-necked plesiosaurs)

                    Marine reptile

                    Rhomaleosaurus (203.6～175.6 Mya; Great Dying④), Liopleurodon   (164.7～161.2 Mya; １０m), Peloneustes   (164.7～155.7 Mya), Kronosaurus   (145.5～65.5 Mya; １３m), Leptocleidus (136.4～99.6 Mya)

              • Superorder Lepidosauria (Lizards, Snakes, Tuatara)
            • Infraclass Archosauromorpha (Crocodiles, Pterosaurs, Dinosaurs)