Deep-Sea Discovery in the Arabian Sea

Marine scientists have uncovered a previously unknown species of electric ray in the deep waters of the southeastern Arabian Sea. Announced by the Zoological Survey of India (ZSI), the discovery marks the first confirmed record of the genus Tetronarce in the northern Indian Ocean, shedding light on the poorly explored biodiversity within the region's deep-sea ecosystems.

The findings were the result of extensive research conducted under the Ministry of Earth Sciences' Deep Ocean Mission project and have been officially published in the international taxonomy journal Zootaxa.

Unique Physical and Genetic Traits

Electric rays are cartilaginous, slow-moving bottom-dwellers that inhabit sandy or muddy seabeds. Like their larger relatives, the manta rays, these creatures possess specialized organs capable of generating electric shocks—ranging from eight to 220 volts—used both to stun prey and deter potential predators.

According to the research team, deep-sea marine habitats remain among the most challenging ecosystems to study. However, detailed examination of the newly identified specimen revealed distinct characteristics:

- Coloration and Form: A uniformly dark bluish-black to dark-brown dorsal coloration, a disc wider than its length, and an absence of papillae around the spiracles. - Anatomical Markers: Relatively large endolymphatic pores, small electric organs, and a total vertebral count of 99. - Genetic Validation: Mitochondrial COI and ND2 gene sequencing confirmed that the specimen represents a distinct evolutionary lineage.

Honoring Leadership

In recognition of his contributions to marine exploration, the newly identified species has been officially named Tetronarce Ramanamurthy. The designation honors Dr. M.V. Ramana Murthy, Mission Director of the Deep Ocean Mission under the Ministry of Earth Sciences.

While electric rays share a general resemblance to manta rays—featuring rounded, thick bodies and stubby tails—they are considerably smaller. Manta rays can grow to massive sizes with wingspans reaching up to 29 feet, whereas electric rays remain small to medium in scale.