Amphibians are divided into 3 groups: caecilians, salamanders & this pair of hoppers
... 
Amphibians can be divided into three groups: Urodela (salamanders), Anura (
frogs), and ... Caecilians are blind, limbless vertebrates that resemble 
earthworms and are... [DOC] [TLE] There are about 5,500 known amphibian species, divided into 3 ... [PAR] ... divided into 3 main groups: salamanders, newts, and mudpuppies; caecilians; 
and frogs and toads.