• Deuterostomata
• Echinodermata
• Hemichordata
• Chordata
• Urochordata
• Cephalochordata
• Craniata
• Mixinoidea
• Vertebrata
• Hyperoartia
• Jawless Fishes
• Gnathostomata
• Placodermi
• Chondrichthyes
• Teleostomi
• Acanthodii
• Osteichthyes
• Actinopterygii
• Sarcopterygii
• Coelacanthimorpha
• Dipnoi
• Tetrapoda
• Amphibia
• Amniota
• Synapsida
• Primitive Synapsids
• Mammalia
• Monotremata
• Marsupialia
• Eutheria
• Edentata
• Glires
• Archonta
• Insectivora
• Carnivora
• Ungulata
• Reptilia
• Testudines
• Diapsida
• Primitive Diapsids
• Sauria
• Ichthyosauria
• Sauropterygia
• Lepidosauromorpha
• Archosauromorpha
• Crocodylomorpha
• Pterosauria
• Dinosauria

Character Details

egg laying

egg laying (a primitive condition they retain)

  +-Deuterostomata
    +-Echinodermata
      +-Hemichordata
      +-Chordata
        +-Urochordata
          +-Cephalochordata
          +-Craniata
            +-Mixinoidea
            +-Vertebrata
              | +-Hyperoartia
              | +-Jawless Fishes
              +-Gnathostomata
                +-Placodermi
                  +-Chondrichthyes
                  +-Teleostomi
                    +-Acanthodii
                    +-Osteichthyes
                      +-Actinopterygii
                      +-Sarcopterygii
                        | +-Coelacanthimorpha
                        | +-Dipnoi
                        +-Tetrapoda
                          +-Amphibia
                          +-Amniota
                            +-Synapsida
                            | +-Primitive Synapsids
                            | +-Mammalia
                            |   +-MONOTREMATA   <<<<< Taxon for this page
                            |   +-Marsupialia
                            |   +-Eutheria
                            |     +-Edentata
                            |       +-Glires
                            |       +-Archonta
                            |       +-Insectivora
                            |       +-Carnivora
                            |       +-Ungulata
                            +-Reptilia
                              | +-Testudines
                              +-Diapsida
                                +-Primitive Diapsids
                                +-Sauria
                                  +-Ichthyosauria
                                  +-Sauropterygia
                                  +-Lepidosauromorpha
                                  +-Archosauromorpha
                                    +-Crocodylomorpha
                                      +-Pterosauria
                                      +-Dinosauria