A remarkable fossil discovery in Brazil is reshaping our understanding of early life on land. Scientists have identified Spongiophyton nanum, a 410-million-year-old organism from the Early Devonian period, as one of the oldest and most widespread lichens ever found. This finding suggests that lichens were already thriving during a pivotal moment in Earth’s history—when life first began to colonize land.
🌍 A Key Player in Earth’s Transformation
The fossilized remains of Spongiophyton nanum were unearthed in the Ponta Grossa Formation of the Paraná Basin in Brazil, a region that was once part of the ancient supercontinent Gondwana. These fossils are not just old—they’re exceptionally well-preserved, with organic material intact, offering a rare glimpse into early terrestrial ecosystems.
- The organism displays a symbiotic structure of fungi and algae, a hallmark of modern lichens.
- Researchers believe it played a crucial role in soil formation, enabling the establishment of vascular plants and, eventually, terrestrial animals.
- The presence of chitin, a nitrogen-rich compound found in insect exoskeletons, further confirms its lichen identity.
🔬 A “Eureka” Moment in Paleontology
Dr. Bruno Becker-Kerber of Harvard University, lead author of the study, emphasized that Spongiophyton nanum was not a marginal organism but a pioneer in transforming Earth’s surface. Its ability to break down rock and contribute to soil development would have been essential for the success of early land plants.
Professor Jochen Brocks of the Australian National University described the discovery as a “Eureka moment,” noting the unprecedented nitrogen signal detected in the fossil—evidence of chitin and a strong indicator of lichen biology.
🧪 Cutting-Edge Techniques Reveal Ancient Secrets
The research team combined traditional paleobotanical methods with 3D nanometric imaging at the Brazilian Synchrotron Light Laboratory. This allowed them to visualize the intricate fungal and algal networks within the fossil, confirming its classification as a true lichen.
Dr. Nathaly L. Archilha, who led the imaging work, highlighted the importance of integrating advanced technology with classical fossil analysis to uncover such delicate and ancient biological structures.
🌱 Why It Matters Today
Lichens continue to play a vital role in modern ecosystems:
- Producing soil in extreme environments
- Recycling nutrients
- Capturing atmospheric carbon
Understanding their ancient origins helps scientists trace the evolution of Earth’s biosphere, especially during the Devonian period, a time of rapid ecological innovation.
📚 Source
This article is based on the report from Sci.News and the original research published in Science Advances (Becker-Kerber et al., 2025. DOI: 10.1126/sciadv.adw7879).
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