The baraminic status of the tuatara (Sphenodon punctatus), the only extant species of the reptilian order Rhynchocephalia, is an intriguing question for creation science. This animal superficially resembles lizards in its anatomy, yet has special physical and genomic characteristics which make it discontinuous with all other reptiles. A previous morphological baraminology study strongly suggested that the tuatara belongs to its own distinct group. In this study, the genomic analysis of 61 reptile genomes using the whole-genome k-mer signature reinforces this conclusion.