Millipedes Colonized Land 80 Million Years Before Vertebrates

A groundbreaking study led by Virginia Tech researchers has mapped the complete evolutionary family tree of millipedes, revealing that these arthropods established themselves on land approximately 460 million years ago. This timeline places millipedes on terrestrial landscapes more than 80 million years before the first vertebrates made the transition from water to land, positioning them as critical pioneers in the development of early Earth ecosystems.

To complete this evolutionary puzzle, the research team had to overcome a century-old hurdle: the classification of two elusive millipede groups, Siphoniulida and Siphonocryptida. Because these species are rare and difficult to locate, they had previously been excluded from genetic analysis. By conducting extensive field expeditions in Mexico and the Canary Islands, the scientists successfully collected specimens for DNA sequencing. Integrating this new genetic data with fossil records allowed the team to reconstruct the lineage of all living millipede orders with unprecedented accuracy.

The findings provide more than just a historical timeline; they highlight the essential role millipedes played as early ecosystem engineers. As primary decomposers, these creatures were instrumental in breaking down organic matter, effectively preparing the soil and environment for the more complex life forms that followed. By clarifying the evolutionary history of these ancient arthropods, the study offers a deeper understanding of the foundational biological processes that paved the way for the terrestrial biodiversity we see today, including the eventual emergence of vertebrates.