Scientists have described a new species of electric ray from the deep waters of the southeastern Arabian Sea, adding to scientific understanding of marine biodiversity in the northern Indian Ocean.
The species, named Tetronarce ramanamurthyi, is commonly known as the Arabian Black Electric Ray. The research was conducted by scientists at the Marine Biology Regional Centre of the Zoological Survey of India in Chennai, working with international collaborators.
Editorial Insight
Key Highlights
Important points readers should notice.
Issue/Event: Scientists described a new electric ray species, Tetronarce ramanamurthyi.
Location: Deep waters of the southeastern Arabian Sea, northern Indian Ocean.
Authority/Organisation: Zoological Survey of India, under the Ministry of Environment, Forest and Climate Change, with research conducted through the Deep Ocean Mission.
Action Taken: Researchers examined nine specimens and used anatomical and mitochondrial DNA evidence to establish the species’ distinct identity.
Impact: The discovery records the first confirmed occurrence of the genus Tetronarce in the northern Indian Ocean and expands knowledge of regional marine biodiversity.
The description was based on nine specimens collected off India’s southwestern coast. The researchers examined physical characteristics and genetic evidence to distinguish the ray from other members of its genus.
A first confirmed record for the region
The discovery represents the first confirmed record of the genus Tetronarce in the northern Indian Ocean. Researchers say the finding highlights how much remains to be understood about deep-sea ecosystems, where many species are difficult to observe and study.
Editorial Analysis
Why This Matters
The discovery is significant for three main reasons. Biodiversity documentation: It adds a scientifically described species to the known marine life of the Arabian Sea. Research value: Combining anatomical examination with genetic analysis helps scientists distinguish closely related species. Conservation planning: Reliable species identification is a foundation for future research into habitat distribution, ecological roles and possible threats. The finding also highlights the need for continued exploration of deep-sea environments. It does not, by itself, demonstrate that the species is endangered or that its population is declining.
The ray has a uniformly dark bluish-black to dark-brown upper surface. Its body disc is wider than it is long, and it has distinctive anatomical features around its respiratory openings and electric organs.
DNA analysis helped confirm the species
The research team used mitochondrial DNA sequences from the COI and ND2 genes alongside physical examination. The COI analysis found genetic divergence ranging from 2.2% in comparison with T. tokionis to 6.7% compared with T. nobiliana.
The combination of genetic and morphological evidence supported the recognition of T. ramanamurthyi as a distinct evolutionary lineage.
Why electric rays are distinctive
Electric rays belong to a group of cartilaginous fishes that can produce electrical discharges using specialised organs. These discharges are used in prey capture and defence.
The newly described species has relatively small electric organs compared with its overall body dimensions. However, the published description does not establish the exact voltage or strength of the electrical discharge produced by this particular species.
Named in honour of an Indian marine scientist
The species name honours Dr M. V. Ramana Murthy, recognised for contributions to marine science, ocean engineering and marine hazard mitigation. The research was carried out under India’s Deep Ocean Mission, which supports the study of deep-sea organisms and ecosystems.
Scientists expect continued exploration to improve knowledge of marine biodiversity in Indian waters. The discovery itself does not establish the species’ population size, conservation status or full geographical range; those questions require further research.
