Science & Tech · Science & Environment · 59 mins ago
Study finds Sri Lanka’s cobras form a distinct genetic lineage
A new genetic study finds that Sri Lanka’s spectacled cobras form a distinct lineage from cobras on the Indian mainland.
The researchers estimate that the lineages diverged about two million years ago, and trace the snakes’ ancestry to Africa via the Middle East.
The study examined 67 cobras using nine genetic markers, building on a debate that began with a Sri Lankan zoologist’s description of a distinctive cobra form in 1939.
A 2022 study proposed naming the Sri Lankan cobra as a separate species, but herpetologists challenged that conclusion in 2023, citing limited sampling and reliance on mitochondrial DNA.
The new findings support genetic distinctiveness but do not establish a separate species.
The decision is now for taxonomists to determine, and the question matters to Sri Lanka’s natural heritage as well as its traditions and folklore.
A new study finds that Sri Lanka’s spectacled cobras form a genetically distinct lineage from cobras on the Indian mainland.
The study estimates that the lineages diverged around two million years ago.
Researchers examined 67 cobras using nine mitochondrial and nuclear genetic markers.
The findings do not formally establish the Sri Lankan lineage as a separate species.
The study says spectacled cobras evolved from an African ancestor that reached the region via the Middle East.
- Who
- Researchers studying Sri Lanka’s spectacled cobra and the Indian mainland cobra lineage.
- What
- A study found that Sri Lanka’s cobras form a genetically distinct lineage. It did not formally establish them as a separate species.
- When
- The study was reported on October 13, 2026; it estimates the lineages diverged around two million years ago.
- Where
- Sri Lanka and the Indian mainland.
- Why
- The lineages are genetically distinct and geographically isolated; the study suggests past sea-level changes may have contributed to their separation.
Proponents of species-level recognition
Skeptics of species-level recognition
Species status
Proponents of species-level recognition
A 2022 genetic study proposed recognizing Sri Lanka’s cobra as a separate species, Naja polyocellata.
Skeptics of species-level recognition
In 2023, Wolfgang Wüster and Frank Tillack argued that the evidence for a species-level split was insufficient.
Evidence
Proponents of species-level recognition
The latest study finds that Sri Lankan cobras form a genetically distinct lineage.
Skeptics of species-level recognition
The 2023 critics said earlier sampling was limited to peninsular India and relied heavily on mitochondrial DNA.
P. E. P. Deraniyagala described a distinctive form of the spectacled cobra with additional eye-like markings on its hood.
A genetic study proposed recognizing the Sri Lankan cobra as a separate species, Naja polyocellata.
Wolfgang Wüster and Frank Tillack challenged the case for a species-level split.
Mongabay reported the latest study’s finding that Sri Lankan cobras form a genetically distinct lineage.
- Estimated divergence
- Around two million years ago
- Study sample
- 67 individuals
- Genetic markers
- Nine mitochondrial and nuclear markers
- Proposed species name
- Naja polyocellata
- Ancestor
- African, reaching the region via the Middle East
What people are saying
Rather than simply comparing a handful of Sri Lankan and mainland snakes, we examined 67 individuals and used nine mitochondrial and nuclear genetic markers to investigate the evolutionary history of the species
Sources
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