Aizawl: Researchers from Mizoram University have discovered a new species of bent-toed gecko in the Umrangso area of Assam’s Dima Hasao district.The species, named Cyrtodactylus dimaensis, belongs to the Cyrtodactylus khasiensis species group. The discovery was reported in a research paper published in the “Journal of Threatened Taxa”.The study was conducted by Krijoboti Thaosen, Mathipi Vabeiryureilai, Mara Duasa Hlychho and Hmar Tlawmte Lalremsanga, head of the Department of Zoology at Mizoram University. They identified the new species by combining an examination of its physical characteristics with molecular and genetic analysis.Field surveys were conducted during August 2025 and July 2026, covering seven nights of fieldwork. The researchers recorded specimens in microhabitats around Umrangso, including rocky areas, and examined their physical features and genetic characteristics to establish their identity.The new species was distinguished by a combination of characteristics, including the arrangement of scales and specialised structures on its body. Statistical analysis of physical measurements also showed differences between the gecko and other members of the Cyrtodactylus khasiensis species group.The study places C. dimaensis within a lineage of bent-toed geckos associated with the Indo-Myanmar region. The researchers noted that the species is closely related to Cyrtodactylus vanarakshaka, another gecko described from Dima Hasao, but differs in its genetic and morphological characteristics.The discovery brings the number of described Cyrtodactylus species recorded from Assam to eight, according to the paper.Dima Hasao forms part of the Indo-Myanmar biodiversity hotspot, a region known for its rich variety of plants and animals. Its hills, valleys, forests and varied elevations create diverse habitats that can support distinct species.The researchers said geographical isolation and differences in habitat may have contributed to the evolution of separate gecko species in the region. They also highlighted the need for further field surveys to document the district’s reptile diversity.The discovery adds to growing scientific evidence that Northeast India still harbours species that have yet to be formally documented. The study received support from the ministry of tribal affairs and the department of science and technology, govt of India.
