Dichotomous Key/Amphibia
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1[edit | edit source]
Chordata keys |
Subphyla |
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Myxini | Urochordata |
Classes |
Actinistia | Actinopterygii | Amphibia | Aves | Chondrichthyes | Dipnoi | Mammalia | Petromyzontida | Reptilia |
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2: Salientia[edit | edit source]
3[edit | edit source]
4: Gymnophiona[edit | edit source]
5: Caudata[edit | edit source]
- Narrow grooves between each nostril and the upper lip
- Present - Plethodontidae
- Not present - 14
6[edit | edit source]
- Inscriptional ribs
- Present - Leiopelmatidae
- Not present - Ascaphus truei
7[edit | edit source]
- Endochondral ossifications in the hyoid plate (distinct from parahyoid bones)
- Present - Bombinatoridae
- Not present - 8
8[edit | edit source]
- Narrow epipubic cartilage plate
- Present - Discoglossidae
- Not present - 9
9[edit | edit source]
- Astragalus and calcaneum
- Fused - Pelodytidae
- Not fused - 10
10[edit | edit source]
11[edit | edit source]
- Tongue shape
- Paddle-shaped - Megophryidae
- Other or not existent - 12
12[edit | edit source]
- Tongue
- Present - Neobatrachia
- Not present - Pipidae
13[edit | edit source]
- Elongate atlantal neural arch
- Present - Rhinophrynus dorsalis
- Not present - Pelobatidae
14[edit | edit source]
15: Salamandroidea[edit | edit source]
Dicamptodontidae, Salamandridae, Ambystomatidae, Proteidae, Rhyacotritonidae, Amphiumidae
16[edit | edit source]
17: Cryptobranchoidea[edit | edit source]
- Metamorphosis
- Partial - Cryptobranchidae
- Full - Hynobiidae
18[edit | edit source]
19[edit | edit source]
- Operculum
- Present - Salamandridae
- Not present - Amphiumidae
20[edit | edit source]
- Lacrimal bone
- Present - Dicamptodontidae
- Not present - Ambystomatidae
21[edit | edit source]
- Bilaterally paired septomaxillary bones
- Present - Rhyacotritonidae
- Not present - Proteidae