Research paper published: 15 September 2026 • News: 16 September 2026
Prelims • Environment, marine biodiversity and taxonomy
Why in the News
Scientists at ICAR-Central Marine Fisheries Research Institute (CMFRI), Kochi described Ariosoma cmfriense, a new species of conger eel from the depths of the Arabian Sea. The paper was published in Zootaxa on 15 September 2026. The Hindu reported it on 16 September 2026.
The key point to remember:
The species has been described from a single specimen. It was treated as a separate species on the basis of both morphological characters and molecular (COI gene) evidence. The name honours the 80th anniversary of ICAR-CMFRI.
What Did the Paper and the Institute Say?
According to the abstract of the paper, a single specimen (255 mm total length) was found off Kollam (written "Quilon" in the paper). According to CMFRI it was collected in January 2026 from a depth of about 300 metres. The features that separate it from the 12 valid Ariosoma species of Indian and adjacent waters include a low total number of vertebrae (135), 127 to 130 pores in the lateral line, a plain pectoral fin, a dark spot on the gill cover (operculum) and fine black speckles below the lateral line.
In the phylogenetic tree of the COI gene, it came out as the sister lineage of Ariosoma indicum, and the two differ by about 7%. According to the authors, this difference lies outside the difference usually seen among individuals of one species. According to CMFRI, the discovery was made under the research component of the Deep Ocean Mission of the Ministry of Earth Sciences (MoES), and the holotype is kept in the ICAR-CMFRI Marine Biodiversity Museum.
Where Does the Confusion Arise in the Exam?
"Description of a new species" and "discovery of a large population" are not the same thing; here the basis is one specimen. Also, the date of the paper (15 September) and the date of the news (16 September) are different, and the Deep Ocean Mission belongs to MoES, not ICAR; ICAR-CMFRI is only the institution that carried out the research.
Preparation Direction from Past Questions:
Statement-based questions have appeared in the official UPSC Prelims 2023 General Studies Paper-I. So prepare the species, the institution and the programme separately. The questions below are original practice questions, not actual PYQs.
To understand another marine analysis, read: New ribbonfish Cyttopsis indica: from the depths of the Arabian Sea.
Prelims-Style Practice Questions
1. With reference to Ariosoma cmfriense, consider the following statements:
Statement 1: It has been described on the basis of a single specimen.
Statement 2: In the analysis of the COI gene it came out as the sister lineage of Ariosoma indicum.
Statement 3: According to the paper, the difference of about 7% in COI proves that it is only a subspecies of A. indicum.
How many of the above statements are correct?
(a) Only one
(b) Only two
(c) All three
(d) None
View Answer and Explanation
Answer: (b) Only two. Statements 1 and 2 are correct. Statement 3 is incorrect; according to the abstract, the difference of about 7% lies outside the normal range among individuals of one species and favours a separate species.
2. According to CMFRI, under the research component of which national programme was Ariosoma cmfriense discovered?
(a) Deep Ocean Mission (Ministry of Earth Sciences)
(b) Project Tiger
(c) Namami Gange
(d) National Mission for Green India
View Answer and Explanation
Answer: (a). CMFRI has described it as a research component of the Deep Ocean Mission of MoES.
3. On what basis was the species named "cmfriense"?
(a) After the village of the discovery site
(b) After the institute, in honour of the 80th anniversary of ICAR-CMFRI
(c) After a fisherman
(d) On the basis of colour
View Answer and Explanation
Answer: (b). According to CMFRI, the species was named after the institute on the occasion of its 80th anniversary.
Sources:
- Zootaxa: Ariosoma cmfriense sp. nov., a new species of conger eel from Indian waters, 15 September 2026.
- ICAR-CMFRI: New eel species described by ICAR-CMFRI, named after Institute.
- The Hindu: New eel species described from Arabian Sea, named after CMFRI, 16 September 2026.
- UPSC: Prelims 2023, question paper.
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