 Experts disagree over whether temnospondyls were ancestral to modern amphibians ( frogs , salamanders , and caecilians ) , or whether the whole group died out without leaving any descendants . Different hypotheses have placed modern amphibians as the descendants of temnospondyls , another group of early tetrapods called lepospondyls , or even as descendants of both groups ( with caecilians evolving from lepospondyls and frogs and salamanders evolving from temnospondyls ) . Recent studies place a family of temnospondyls called the amphibamids as the closest relatives of modern amphibians . Similarities in teeth , skulls , and hearing structures link the two groups . 
 Experts disagree over whether temnospondyls <a href='uninflect' title='1'><mark>were</mark></a> ancestral to modern amphibians ( frogs , salamanders , and caecilians ) , or whether the whole group died out without leaving any descendants . Different hypotheses <a href='been_done' title='2'><mark>have</mark></a> placed modern amphibians as the descendants of temnospondyls , another group of early tetrapods called lepospondyls , or even as descendants of both groups ( with caecilians evolving from lepospondyls and frogs and salamanders evolving from temnospondyls ) . Recent studies place a family of temnospondyls called the amphibamids as the closest relatives of modern amphibians . Similarities in teeth , skulls , and hearing structures link the two groups . 
Experts disagree over whether temnospondyls was ancestral to modern amphibians ( frogs , salamanders , and caecilians ) , or whether the whole group died out w/o leavin any descendants . diffrent hypotheses done placed modern amphibians as the descendants of temnospondyls , anotha group of early tetrapods called lepospondyls , or even as descendants of both groups ( with caecilians evolving from lepospondyls and frogs and salamanders evolving from temnospondyls ) . Recent studies place a family of temnospondyls called da amphibamids as tdaclosest relatives of modern amphibians . Similarities in teef , skulls , and hearing structures link the two groups .