 Several suborders of stegocephalians were recognized in the late 19th and early 20th centuries . Animals now regarded as temnospondyls were primarily labyrinthodonts , but some were classified in the Branchiosauria . Branchiosaurs were small @-@ bodied and had simple conical teeth , while labyrinthodonts were larger and had complex , folded dentin and enamel in their teeth . Branchiosauria included only a few forms , such as Branchiosaurus from Europe and Amphibamus from North America , that had poorly developed bones , external gills , and no ribs . Some skeletons of Amphibamus were later found with long ribs , prompting its reassignment to Microsauria ( although more detailed studies found it to be a temnospondyl ) . Soft tissue , such as scales and external gills , were found in many well @-@ preserved branchiosaur fossils from Germany . In the early 20th century , branchiosaurs would be recognized as larval forms of temnospondyls lacking many of the typical features that define the group , and is no longer recognized as a distinct group . 
 Several suborders of stegocephalians <a href='uninflect' title='1'><mark>were</mark></a> recognized in the late 19th and early 20th centuries . Animals now regarded as temnospondyls <a href='uninflect' title='2'><mark>were</mark></a> primarily labyrinthodonts , but some <a href='uninflect' title='3'><mark>were</mark></a> classified in the Branchiosauria . Branchiosaurs <a href='uninflect' title='4'><mark>were</mark></a> small @-@ bodied and had simple conical teeth , while labyrinthodonts <a href='uninflect' title='5'><mark>were</mark></a> larger and had complex , folded dentin and enamel in their teeth . Branchiosauria included only a few forms , such as Branchiosaurus from Europe and Amphibamus from North America , that <a href='been_done' title='6'><mark>had</mark></a> poorly developed bones , external gills , and no ribs . Some skeletons of Amphibamus <a href='uninflect' title='7'><mark>were</mark></a> later found with long ribs , prompting its reassignment to Microsauria ( although more detailed studies found it to be a temnospondyl ) . Soft tissue , such as scales and external gills , <a href='uninflect' title='8'><mark>were</mark></a> found in many well @-@ preserved branchiosaur fossils from Germany . In the early 20th century , branchiosaurs would be recognized as larval forms of temnospondyls lacking many of the typical features <a href='null_relcl' title='9'><mark>that</mark></a>define the group , and is no longer recognized as a distinct group . 
Several suborders of stegocephalians was recognized in the late 19th and early 20th centuries . Animals now regarded as temnospondyls was primarily labyrinthodonts , but some was classified in da Branchiosauria . Branchiosaurs was small @-@ bodied and had simple conical teeth , while labyrinthodonts was larger and had complex , folded dentin and enamel in their teeth . Branchiosauria included only a few forms , such as Branchiosaurus from Europe and Amphibamus from North America , dat done poorly developed bones , external gills , and no ribs . Some skeletons of Amphibamus was later found with long ribs , prompting its reassignment to Microsauria ( although more detailed studies found it to b a temnospondyl ) . Soft tissue , such as scales and external gills , was found in many well @-@ preserved branchiosaur fossils from Germany . In the early 20th century , branchiosaurs would bbrecognized as larval forms of temnospondyls lacking many of the typical features define the group , and ain't no longer recognized as a distinct group .