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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsAnts survived the end-Cretaceous mass extinction as a lineage, but not every ancient ant group made it through. The fossil record indicates that early stem-ant lineages disappeared around the Cretaceous–Paleogene (K–Pg) boundary, while crown ants—the group that includes the ancestors of living ants—persisted. A leading explanation is that flowering-plant ecosystems offered ants a range of habitats and food resources that helped buffer them as environments changed. That is a plausible ecological explanation, not proof of one adaptation that saved every ant.
What does it mean that ants survived?
The extinction about 66 million years ago ended the reign of the non-avian dinosaurs. Birds are living dinosaurs, but they are not the focus of the ant evidence discussed here.
For ants, survival means that at least some lineages continued across the boundary—not that every Cretaceous ant group survived unchanged. Paleontologists distinguish between stem ants, early-diverging forms with no living descendants, and crown ants, the lineages that include the ancestors of modern ants. Fossils show that crown ants were already present before the extinction, while stem ants persisted late into the Cretaceous and appear to have been lost around the boundary.
What fossils show about ant turnover
A 2024 study by Sosiak and colleagues reports stem ants in North Carolina amber dated to about 77 million years ago, among the youngest stem ants known. Separate evidence from central Myanmar amber, dated to about 72.1 million years ago, records crown-ant subfamilies before the K–Pg event. Together, these finds point to a long period when stem and crown ants coexisted, followed by a turnover in which crown ants persisted and stem lineages vanished.
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The fossil record near the boundary is incomplete. It cannot establish exactly when stem-ant groups disappeared or identify a single cause. The evidence therefore supports ant persistence alongside losses within the group, not immunity from extinction.
How flowering plants may have buffered ants
A 2024 analysis, The Angiosperm Terrestrial Revolution buffered ants against extinction, combines fossil and living-ant occurrence data to examine ant diversification. Its dataset includes approximately 24,000 fossil-ant occurrences and 14,000 occurrences of living ants; these are records in the dataset, not counts of species or colonies that survived the extinction.
The study proposes that the expansion of flowering plants created varied ecological opportunities. Forest leaf litter and soil offered places to forage and nest, while trees opened arboreal habitats. Plant communities also supplied resources that could support different diets and roles in food webs. Access to multiple habitats and resources may have made some ant lineages more resilient as vegetation and ecosystems changed.
An earlier synthesis of ant evolution likewise linked ant expansion to flowering-plant communities, describing a broad shift from forest ground litter and soil into the canopy and other environments over time. This points to ecological expansion—not a single new trait—as a useful way to understand ant diversification. It does not establish that flowering plants alone caused ants to survive the K–Pg event.
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What remains uncertain
The key distinction is between evidence for turnover and a proposed explanation for persistence. Amber fossils document ant groups before the boundary, but gaps in the record limit what can be said about the precise timing and causes of their losses. The flowering-plant explanation is an inference from comparative fossil and ecological evidence; it does not show what happened to individual colonies or prove that any one habitat or food source determined survival.
Broader work on end-Cretaceous food webs and survivorship describes how ecological change shaped survival and extinction across organisms, but it is not direct evidence for the specific ant mechanism. See the 2022 study in Science Advances for that wider context.
Quick Recap
Sources for the fossil evidence
- Sosiak et al. (2024), “Prolonged faunal turnover in earliest ants revealed by North American Cretaceous amber,” Current Biology: stem ants, North Carolina amber and turnover uncertainty.
- “A Late Cretaceous amber biota from central Myanmar” (2018): crown-ant subfamilies in pre-boundary amber.
- Moreau et al. (2005), “The rise of the ants: A phylogenetic and ecological explanation”: earlier discussion of flowering plants, litter, canopy habitats and ant diversification.
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