Credit: Michael Linnenbach at the German language Wikipedia

First amphibian, the African clawed frog

The first amphibian genome to be sequenced belongs to the frog Xenopus tropicalis, a slimy rotund amphibian also known as the African clawed frog. The genome study enables researchers to compare genes in mammals to those of the amphibians to see which genes stay the same and which have changed since mammals and amphibians parted 360 million years ago, which pinpoints the important basic genes that all complex life needs, including genes involved in the heart and lungs.