An ancient icon reveals new mysteries: mummy DNA resurrects a cryptic species within the Nile crocodile

A cryptic species within the Nile crocodile (Crocodylus niloticus) has been identified through advanced genetic and karyotype analysis, reshaping our understanding of the genus Crocodylus' biogeographic history. This discovery resolves long-standing taxonomic disputes and reveals that two distinct lineages—including one previously described as Crocodylus suchus—coexisted in ancient Nile populations. Museum specimens, including mummified crocodiles from UNESCO World Heritage Site Ancient Thebes, were pivotal in reconstructing extinct genetic profiles. Current conservation efforts for the Nile crocodile may inadvertently harm the declining cryptic species, underscoring the need for refined management strategies based on accurate taxonomic recognition.

HEKKALA, E., SHIRLEY, M. H., AMATO, G., AUSTIN, J. D., CHARTER, S., THORBJARNARSON, J., VLIET, K. A., HOUCK, M. L., DESALLE, R., & BLUM, M. J. (2011). An ancient icon reveals new mysteries: mummy DNA resurrects a cryptic species within the Nile crocodile. Molecular Ecology, 20(20), 4199–4215. https://doi.org/10.1111/j.1365-294x.2011.05245.x