 During the Late <unk> , increasing <unk> and the <unk> of reptiles contributed into a decline in terrestrial <unk> , but <unk> and fully aquatic <unk> continued to <unk> , including the large <unk> of Eastern Europe . Other <unk> , such as <unk> , developed long <unk> and a close similarity to <unk> , although they lacked the armor characteristic of the latter group . These <unk> included the largest known amphibian , the 9 @-@ m @-@ long <unk> of Brazil . 
