Termite Evolution Driven by Global Extinctions and Breakthrough Soil-Digestion Innovations According to Genomic Study

New genomic research reveals how termites evolved in two major waves following global extinctions to become the primary decomposers of tropical rainforests.

By: AXL Media

Published: May 1, 2026, 11:07 AM EDT

Source: Information for this report was sourced from EurekAlert!

The Evolutionary Rise of Tropical Ecosystem Engineers

Termites have long served as the fundamental infrastructure of tropical environments, yet their ascent to ecological dominance was not a gradual process. New research published in Current Biology by the Okinawa Institute of Science and Technology (OIST) indicates that these insects rose to prominence through sudden bursts of diversification. By analyzing the DNA of almost all termite species across the Americas, the international team determined that modern termite traits emerged in two distinct waves. These pulses were closely linked to the aftermath of the End-Cretaceous and Eocene-Oligocene extinction events, which cleared the path for new biological lineages to flourish in the wake of global upheaval.

Extinction as a Catalyst for Biological Opportunity

The first major wave of termite diversification occurred approximately 66 million years ago, potentially triggered by the meteor impact that concluded the reign of the dinosaurs. According to Dr. Simon Hellemans, a study co-first author, while this catastrophic event likely wiped out several existing termite lineages, it simultaneously opened numerous ecological niches. This vacuum allowed surviving groups to expand and adapt to a changing world. The study suggests that the resilience of these insects during periods of planetary collapse was essential to their eventual success, as they moved to occupy roles left vacant by other extinct organisms.

Surviving the Global Freeze of the Oligocene

A second and more definitive pulse of evolution took place about 33 million years ago following the Eocene-Oligocene extinction. During this era, a rapid drop in global temperature by 8 degrees Celsius caused rainforests to retreat toward the tropics, transforming vast regions into savannas and temperate forests. Professor Thomas Bourguignon explains that while this climate shift was fatal for many species, a specific group of termites had recently developed a breakthrough innovation. This development allowed them to thrive in environments where previous food sources had vanished, ensuring their survival through one of the most significant cooling periods in Earth's history.