The results obtained from molecular data clearly indicated that they are genetically distinct species. (sciencedaily.com)
This date is 20 million years younger than suggestions from previous studies which used molecular data from living mammals and assumed a near - constant rate of evolution. (sciencedaily.com)
Studies that instead rely on molecular data indicate that the group appeared as early as 100 million years ago, when dinosaurs were still thriving. (scientificamerican.com)