Scientists Discover New Amphibian Species “Kali Night Frog” (Nyctibatrachus kali) in Karnataka’s Western Ghats

Context:

Scientists have announced the discovery of a new amphibian species, Nyctibatrachus kali, commonly called the Kali night frog, from the central Western Ghats of Karnataka. The species belongs to the ancient genus Nyctibatrachus (the night frogs), which is entirely endemic to the Western Ghats, one of the world’s eight “hottest hotspots” of biological diversity. The Kali night frog inhabits the pristine, torrential stream ecosystems and humid leaf litter of the Castlerock rainforest in the Kali river catchment basin, named after the Kali river that flows through the region.

Key Highlights

• New species: Nyctibatrachus kali (Kali night frog).
• Family: Nyctibatrachidae (Night Frogs).
• Genus: Nyctibatrachus, endemic to the Western Ghats.
• Region: Central Western Ghats, Karnataka, specifically the Castlerock rainforest within the Kali river catchment basin.
• Habitat: Pristine torrential streams, humid leaf litter, shadowed rock crevices.

Key characteristics:

Feature	Description
Cryptic species	Morphologically near-identical to the Kumbara night frog (Nyctibatrachus kumbara)
Genetic identification	Confirmed as separate lineage via DNA isolation and sequencing
Bioacoustic profile	Distinct frequency and pulse patterns in the male’s mating call
Behaviour	Nocturnal, active at night near fast-flowing streams
Distribution	Micro-endemic, restricted to a small pocket of the central Western Ghats

Conservation context:

• Western Ghats is a UNESCO World Heritage Site and one of the world’s eight “hottest hotspots” of biodiversity.
• The Ghats are home to over 180 amphibian species, of which roughly 80 per cent are endemic.
• Micro-endemic species like Kali night frog are particularly vulnerable to:
  • Habitat fragmentation (roads, plantations, hydropower).
  • Climate change (temperature, rainfall shifts).
  • Pollution (agrochemicals in streams).
  • Invasive species and pathogens (e.g., Chytrid fungus).

Background Concepts

What is the genus Nyctibatrachus?

A genus of frogs entirely endemic to the Western Ghats of India, commonly known as night frogs because of their nocturnal behaviour. Members of this ancient lineage are mostly small to medium-sized, stream-associated frogs with specialised adaptations to torrential mountain stream ecosystems. The genus is one of the largest and most diverse frog groups in the Western Ghats, with several recently described members, including the Kumbara night frog and now the Kali night frog.

What is a “cryptic species”?

Two or more species that are morphologically near-identical (so they look the same to the eye) but are genetically, behaviourally, or ecologically distinct. Cryptic species can be identified only through modern molecular tools (DNA sequencing), bioacoustic analysis, ecological studies, or detailed morphometric measurements. The discovery of cryptic species is increasingly common in biodiversity hotspots like the Western Ghats, and has important implications for conservation planning, because each cryptic species may need separate protection strategies.

Practice MCQs

Q1. With reference to the recently discovered Kali night frog, consider the following statements:

1. Its scientific name is Nyctibatrachus kali.
2. It was discovered in the central Western Ghats of Karnataka, in the Kali river catchment basin.
3. It belongs to the genus Nyctibatrachus, which is endemic to the Western Ghats.
4. It is a cryptic species closely resembling the Kumbara night frog (Nyctibatrachus kumbara).

How many of the above statements are correct? (a) Only one (b) Only two (c) Only three (d) All four (e) None

Q2. Consider the following statements about cryptic species:

1. Cryptic species are morphologically near-identical but genetically, behaviourally, or ecologically distinct.
2. They can typically be identified using DNA sequencing, bioacoustic analysis, or detailed morphometric measurements.
3. The discovery of cryptic species often increases the complexity of conservation planning.
4. The Western Ghats has yielded several cryptic amphibian species in recent years.

Which of the above are correct? (a) 1, 2 and 3 only (b) 1, 3 and 4 only (c) 2 and 4 only (d) 1 and 4 only (e) All four

Q3. With reference to the Western Ghats, consider the following statements:

1. It is recognised as one of the world’s “hottest hotspots” of biological diversity by Conservation International.
2. It was designated a UNESCO World Heritage Site in 2012.
3. It runs through Gujarat, Maharashtra, Goa, Karnataka, Kerala, and Tamil Nadu.
4. Around 80 per cent of the amphibian species found in the Western Ghats are endemic.

Which of the above are correct? (a) 1, 2 and 3 only (b) 1, 3 and 4 only (c) 2 and 4 only (d) 1 and 4 only (e) All four

Q4. Consider the following statements about the genus Nyctibatrachus:

1. It is entirely endemic to the Western Ghats of India.
2. The genus is commonly known as “night frogs” because of nocturnal behaviour.
3. Members of the genus are mostly associated with torrential mountain stream ecosystems.
4. The Kumbara night frog and the newly discovered Kali night frog both belong to this genus.

Which of the above are correct? (a) 1, 2 and 3 only (b) 1, 3 and 4 only (c) 2 and 4 only (d) 1 and 4 only (e) All four

Answer Key

1. (d), All four statements are correct.
2. (e), All four statements are correct.
3. (e), All four statements are correct.
4. (e), All four statements are correct.