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A squad of scientists has discovered a caller food taxon and successfully resolved a decades-old evolutionary enigma surrounding 1 of the astir elusive aquatic lineages successful the Western Ghats.
Published successful the diary Systematics and Biodiversity, the survey details the unexpected find of Eechathalakenda incognita, a caller taxon of cyprinid food (Torinae), described from assorted streams wrong the Periyar Tiger Reserve. This recently described taxon had been confused with Eechathalakenda ophicephala for the past 70 years. Both taxon person restricted organisation and look situation threats, suggesting a precocious hazard of extinction and that they are an urgent precedence for conservation efforts.
Eechathalakenda incognita is the ninth point-endemic food taxon (restricted to a azygous determination successful the world) to beryllium identified wrong the Periyar Tiger Reserve. This find besides marks the reserve arsenic 1 of the astir captious sanctuaries for freshwater food conservation, not conscionable successful India, but crossed the full Asian continent.
The genus Eechathalakenda was primitively established successful 1999 for a solitary, enigmatic food taxon archetypal described successful 1941 from the Pamba River successful Kerala. For implicit eighty years, the food remained mostly invisible to science, with its beingness noted lone successful little determination checklists that lacked due taxonomic verification, photographs, oregon preserved specimens.
Driven by a quest to find this elusive creature, a squad of researchers—Swetha Chandra, Rajeev Raghavan, Ravimohanan Abhilash, Ralf Britz, Ryan Babu and Neelesh Dahanukar—from St. Stephens College, Pathanapuram; Christian College, Chengannur; KUFOS, Kochi; and Shiv Nadar Institution of Eminence, Delhi NCR conducted extended fieldwork successful the remote, high-altitude headwaters of the Pamba and Periyar rivers. Upon analysing the carnal characteristics and DNA of the recently collected specimens, they realised they were looking astatine 2 wholly chiseled taxon that had been confused arsenic 1 for the past 70 years.
Distinctive characteristics
Using precocious mitochondrial DNA sequencing, the squad mapped the implicit mitogenome of the hidden species, officially naming it Eechathalakenda incognita in notation to its long-running technological anonymity. The recently identified Periyar Channa Barb is visually and genetically chiseled from its sister species, E. ophicephala. While E. ophicephala sports rhomboid-shaped scales, the caller taxon features circular scales adjacent its precocious body, alongside a unsocial acheronian lateral stripe, a antithetic number of fin rays, and a important 4.9%-5.3% familial variation. Crucially, the familial information besides allowed researchers to firmly spot the full genus wrong the cyprinid subfamily Torinae, yet providing a definitive evolutionary location for this past lineage.
Despite the excitement of the discovery, scientists are sounding an urgent alarm regarding the endurance of some species. Their geographic distributions are exceptionally narrow; E. ophicephala is strictly confined to Pamba stream headwaters implicit 1,000 metres supra oversea level, portion E. incognita is isolated to circumstantial fast-flowing, rocky streams wrong the Periyar Tiger Reserve. Because they are confined to specified restricted habitats, localised threats similar clime shifts and situation degradation enactment some food astatine an utmost hazard of extinction.
