Phylogenetic relationships within the New Zealand frog genusLeiopelma —immunological evidence

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Abstract
Albumin evolution is examined within the anuran genus Leiopelma using the quantitative immunological technique of micro-complement fixation (MC'F). The albumins of L. archeyi and L. hamiltoni are relatively similar to each other, yet both differ greatly from the albumin of L. hochstetteri. Using albumin as a molecular clock, we estimate that L. hochstetteri diverged from the lineage leading to L. archeyi and L. hamiltoni during the Miocene, about 15 million years ago. The divergence of L. archeyi and L. hamiltoni appears to have been a Pliocene event (about 3 million years ago).