A small frog found along the Hratdawng Stream on the Mizoram University campus in Aizawl has been described as a new species, Ingerana aizawl.
The description was published in the journal Zootaxa on 14 September 2026 by researchers from Mizoram University, Cotton University and the conservation group Help Earth.
Populations in Mizoram had long been identified as Ingerana borealis; DNA and morphology showed them to be distinct.
The frog is stout-bodied, 22-26 mm long, dark brown to reddish-brown, and lives around fast-flowing streams between 94 and 823 metres above sea level.
Because its earlier identity was a Least Concern species, the new frog now needs a conservation assessment of its own.
Central university whose campus stream is the type locality; its herpetology group led the description
Conservation organisation that partnered on the survey and description work in the Northeast
Maintains the Red List of Threatened Species; Ingerana borealis, the species Mizoram populations were earlier lumped with, is listed as Least Concern, so the new species now needs its own assessment
Naming a species by combining several independent lines of evidence - body measurements and features, DNA sequences such as the mitochondrial 16S rRNA gene, and calls - rather than appearance alone. It separates look-alike populations that a single method would keep lumped together.
Simple Analogy: Identifying a person by fingerprint, voice and photograph together, not by the photograph alone.
The Hratdawng Stream runs through the Mizoram University campus at Tanhril, about 15 km west of central Aizawl in the hills of Mizoram. The state lies in the Indo-Burma biodiversity hotspot and borders Myanmar and Bangladesh; its protected areas include Murlen and Phawngpui Blue Mountain national parks and the Dampa Tiger Reserve on the Bangladesh frontier.
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The frog family to which the genus Ingerana belongs; it includes many of South and Southeast Asia's stream and paddy-field frogs.
A mitochondrial gene widely used as a DNA barcode in amphibians; divergence in it separated Ingerana aizawl from its relatives.
The standard body measurement for frogs, taken from the snout to the cloacal opening; 22-26 mm in this species.