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Dichotomous Key/Amphibia

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Dichotomous Key: Amphibia
Kingdom: Animalia
Phylum: Animalia
Subphylum: Chordata
Class: Amphibia
Information related to Amphibia
Wikipedia
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Parent key: Chordata
Subphyla
Vertebrata
Key: Amphibia
Vertebrata
Clerck, 1757
  • Number of vertebrae
    • Nine or fewer - 2
    • More than nine - 3
Chordata keys
Subphyla
Myxini | Urochordata
Classes
Actinistia | Actinopterygii | Amphibia | Aves | Chondrichthyes | Dipnoi | Mammalia | Petromyzontida | Reptilia

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2: Salientia

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  • Tailwagging muscles
    • Present - 6
    • Not present - 7
  • Tail
    • Present in all life stages - 5
    • Not present in all life stages - 4

4: Gymnophiona

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5: Caudata

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  • Narrow grooves between each nostril and the upper lip
  • Endochondral ossifications in the hyoid plate (distinct from parahyoid bones)
  • Metatarsal spade
    • Present - 13
    • Not present - 11
  • Fertilization
    • Internal - 15
    • External - #16

15: Salamandroidea

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  • Premaxillae
    • Fused - 18
    • Separated - 19

Dicamptodontidae, Salamandridae, Ambystomatidae, Proteidae, Rhyacotritonidae, Amphiumidae

  • Metamorphosis
    • Present (fully or partially) - 17
    • Not present - Sirenidae

17: Cryptobranchoidea

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  • Operculum
    • Present - 20
    • Not present - 21