Keys to the Orders of U.S. Amphibians

Order names linked to a key of that order.

1 a. Tail present in adult form; front and hind legs similar in size
b. No tail in adults; hind legs adapted for jumping
Order Urodela
Order Anura


Key to the Suborders of Urodela (Salamanders)

Suborder names linked to common name examples.

1 a. 1 pair of limbs, anterior only
b. 2 pairs of limbs
Meantes
2
2 a. Aquatic; eyes reduced; body not eel-like
b. Not as above
3
4
3 a. Adults with gills
b. Adults without gills but with 1 pair of open gill slits
Proteida
Cryptobranchoidea
4 a. Vomerine teeth present
b. Vomerine teeth absent
Salamandroidea
Ambystomoidea

Suborder names and common name examples:


Key to the Suborders of Anura (Toads and Frogs)

Suborder names linked to common name examples.

1 a. Pupil of eye vertical
b. Pupil of eye not vertical
2
3
2 a. With a sharp-edged metatarsal extension
b. No sharp-edged extension on hind foot; male with intromittent organ
Anomocoela
Amphicoela
3 a. Tympanum (eardrum behind eye) present; tip of tongue entire
b. Tympanum absent, or, if present, then tongue notched.
Procoela
Diplasiocoela

Suborder names and common name examples:

Vertebrate Key