Evolutionary Tree of Amphibias

Note that Mya is million years ago. For example, "48.6～40.4 Mya" shows a range between 48.6 and 40.4 million years ago. The time range and the epoch are shown in the Geological Time Table.

Phylogenetic Tree of Amphibias

Kingdom Animalia
- Phylum Chordate
  - Subphylum Vertebra
    - Infraphylum Gnathostomata (Jawed vertebrates)
      - Class Amphibia ⇐ Class Fish (Tetrapodomorpha)
        
        Subclass Labyrinthodontia
        
        Order Ichthyostegalia Primitive amphibia (Intermediate form between fish and amphibians)
        Order Temnospondyli Primitive amphibia (Ancestors of modern amphibians; 449～272.5 Mya)
        
        Suborder Rhachitomi
        Suborder Euskelia
        Suborder Dvinosauria
        Suborder Stereospondyli
        
        Superorder Reptiliomorpha (318.1～272.5 Mya)
        
        Order Anthracosauria (Ancestors of reptiles) Primtive reptile ⇒ Class Reptile
        
        Suborder Embolomeri (Primitive evolution from amphibia)
        Suborder Seymouriamorpha (Small terrestrial amphibians)
        Suborder Diadectomorpha (Large reptile-like amphibians)
        
        Subclass Lepospondyli
        
        Order Adelospondyli Primitive amphibia
        Order Aistopoda (Snake-like amphibians; 307.1～272.5 Mya) Primitive amphibia
        Order Nectridea (Aquatic amphibians; 307.11～272.5 Mya) Primitive amphibia
        Order Microsauria (Lizard-like animals; 318.1～272.5 Mya) Primitive amphibia
        
        Suborder Microbrachomorpha
        Suborder Tuditanomorpha
        
        Order Lysorophia (Snake-like amphibians) Primitive amphibia
        
        Subclass Lissamphibia (Most living amphibias)
        
        Order Allocaudata Salamander-like
        Order Caudata (199.6 Mya～) Salamander Newt
        
        Suborder Cryptobranchoidea (Giant salamanders)
        Suborder Salamandroidea (Advanced salamanders)
        Suborder Sirenoidea (Sirens)
        
        Order Gymnophiona (196.5 Mya～) Newt (Caecilians)
        Order Anura (251 Mya～) Frog (Frogs and Toads)
        
        Suborder Archaeobatrachia (Primitive frogs)
        Suborder Mesobatrachia (Advanced frogs)
        Suborder Neobatrachia (Most advanced frogs)