The mitochondria ! genome oftokay analyses of complete mitochondria ! genomes provide not only information about structural arrangements which may serve as genomic evolutional marker but also sequesenc data for phylogenetic 蛋白编码基因第三编码位置表现为对碱基a的偏好,更接近两栖类以下的较低等脊椎动物而不是羊膜动物。