 Another group called <unk> was named by Cope in 1868 . Cope classified <unk> as a subgroup of Labyrinthodontia , placing many small , amphibian @-@ like animals within it . Among them were <unk> , once placed in <unk> . <unk> was later placed as a <unk> with other <unk> , but confusion existed for many years over the classification of small amphibians . 
