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Scientists find a new frog genus in Andamans, names it after a Sri Lankan taxonomist
BY S VENKAT NARAYAN,
Our Special Correspondent
NEW DELHI. A study by scientists from three countries has reported a new genus of the Old World treefrog family Rhacophoridae — the first report of a tree frog species (Striped Bubble-nest frog) from the Andaman Islands.
The study was led by Prof S D Biju of Delhi University, and included researchers from India, Indonesia and China.
The new genus ‘Rohanixalus’ is named after Sri Lankan taxonomist Rohan Pethiyagoda.
A taxonomist is a biologist who groups organisms into categories. A plant taxonomis, for example, may study the origins and relationships between different types of roses while an insect taxonomist may focus on the relationships between different types of beetles.
The findings are published in an article titled ‘New insights on the systematics and reproductive behaviour in tree frogs of the genus Feihyla, with description of a new related genus from Asia (Anura, Rhacophoridae)’ in the current issue of Zootaxa, an international journal of animal systematics.
“Our discovery of a treefrog member from Andaman Islands is unexpected and once again highlights the importance of dedicated faunal surveys and explorations for proper documentation of biodiversity in a… country like India. This finding also uncovers an interesting new distribution pattern of treefrogs that provides evidence for faunal exchange between Andamans and the Indo-Burma region,” said Biju.
The scientists studied “external morphology of adults and tadpoles, phylogeny, calls, and breeding biology of several treefrog species widely distributed across South, Southeast, and East Asia” to confirm that it is a new genus.
Researchers said Rohanix-alus is the “20th recognised genus of the family Rhacopho-ridae and currently comprises eight out of the 422 known Old World treefrog species found in Asia and Africa”.
They are characterised by a “rather small and slender body (2-3 cm long), a pair of contrastingly coloured lateral lines on either side of the body, minute brown speckles scattered throughout the upper body, light green-coloured eggs laid in arboreal bubble-nests, and several unique behavioural traits including maternal egg attendance”.
Besides DU, the team had researchers from Zoological Survey of India – Andaman and Nicobar Regional Centre, and National Centre for Cell Science, in addition to researchers from Indonesian Institute of Sciences, Chengdu Institute of Biology (China) and Chulalongkorn University (Thailand).
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Environmentalists warn Sri Lanka’s ecological safeguards are failing
Sri Lanka’s environmental protection framework is rapidly eroding, with weak law enforcement, politically driven development and the routine sidelining of environmental safeguards pushing the country towards an ecological crisis, leading environmentalists have warned.
Dilena Pathragoda, Managing Director of the Centre for Environmental Justice (CEJ), has said the growing environmental damage across the island is not the result of regulatory gaps, but of persistent failure to enforce existing laws.
“Sri Lanka does not suffer from a lack of environmental regulations — it suffers from a lack of political will to enforce them,” Pathragoda told The Sunday Island. “Environmental destruction is taking place openly, often with official knowledge, and almost always without accountability.”
Dr. Pathragoda has said environmental impact assessments are increasingly treated as procedural formalities rather than binding safeguards, allowing ecologically sensitive areas to be cleared or altered with minimal oversight.
“When environmental approvals are rushed, diluted or ignored altogether, the consequences are predictable — habitat loss, biodiversity decline and escalating conflict between humans and nature,” Pathragoda said.
Environmental activist Janaka Withanage warned that unregulated development and land-use changes are dismantling natural ecosystems that have sustained rural communities for generations.
“We are destroying natural buffers that protect people from floods, droughts and soil erosion,” Withanage said. “Once wetlands, forests and river catchments are damaged, the impacts are felt far beyond the project site.”
Withanage said communities are increasingly left vulnerable as environmental degradation accelerates, while those responsible rarely face legal consequences.
“What we see is selective enforcement,” he said. “Small-scale offenders are targeted, while large-scale violations linked to powerful interests continue unchecked.”
Both environmentalists warned that climate variability is amplifying the damage caused by poor planning, placing additional strain on ecosystems already weakened by deforestation, sand mining and infrastructure expansion.
Pathragoda stressed that environmental protection must be treated as a national priority rather than a development obstacle.
“Environmental laws exist to protect people, livelihoods and the economy,” he said. “Ignoring them will only increase disaster risk and long-term economic losses.”
Withanage echoed the call for urgent reform, warning that continued neglect would result in irreversible damage.
“If this trajectory continues, future generations will inherit an island far more vulnerable and far less resilient,” he said.
Environmental groups say Sri Lanka’s standing as a biodiversity hotspot — and its resilience to climate-driven disasters — will ultimately depend on whether environmental governance is restored before critical thresholds are crossed.
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