 The suborder Salamandroidea contains the advanced salamanders . They differ from the cryptobranchids by having fused prearticular bones in the lower jaw , and by using internal fertilisation . In salamandrids , the male deposits a bundle of sperm , the spermatophore , and the female picks it up and inserts it into her cloaca where the sperm is stored until the eggs are laid . The largest family in this group is Plethodontidae , the lungless salamanders , which includes 60 % of all salamander species . The family Salamandridae includes the true salamanders and the name " newt " is given to members of its subfamily Pleurodelinae . 
