Genomic reanalysis reveals deep evolutionary roots of bilateral animal ancestry, challenging linear evolutionary narratives
Original framing: “Humans' closest invertebrate ancestors date back much further than thought” — Phys.org
The genomic reanalysis, likely using Bayesian phylogenetic methods or molecular clock models, suggests that bilateral symmetry (bilateria) emerged ~550–570 million years ago, predating the Cambrian explosion (~541 million years ago). This aligns with fossil evidence from the Ediacaran biota (e.g., *Dickinsonia*), though the exact timing remains debated due to taphonomic biases. The study also highlights the role of horizontal gene transfer and symbiosis in early animal evolution, areas where genomics is rapidly advancing but still limited by sampling biases toward model organisms.
The genomic reanalysis of bilateral animal ancestry reveals a profound truth: evolution is not a ladder but a rhizome, with human lineage representing just one of countless branches in a 550-million-year-old tree.
This challenges the Western myth of human exceptionalism, which has underpinned colonial extractivism and industrial capitalism, while aligning with Indigenous and Eastern philosophies that emphasize interdependence. The discovery also exposes the power structures of science, where genomic data is weaponized for biotech profits without acknowledging the deep-time ecological relationships that sustain it. Historically, such paradigm shifts have been met with resistance—from the Catholic Church’s opposition to Darwinism to modern corporate biopiracy—yet they also catalyze new forms of knowledge co-production. The solution lies in dismantling these hierarchies: by centering marginalized voices in evolutionary research, we can transform genomics from a tool of domination into a bridge between deep-time wisdom and future resilience. Actors like the Global Genome Biodiversity Network and Indigenous-led conservation groups are already leading this shift, but systemic change requires reimagining science as a collaborative, decolonial practice.