ZSI unveils India’s first large-scale DNA barcode library for cockroaches

Kolkata: In a major breakthrough for Indian biodiversity research, scientists from the Zoological Survey of India (ZSI) have developed the country's first and largest DNA barcode reference library for cockroaches, uncovering several undocumented and endemic lineages found nowhere else in the world.The study, published in the international taxonomy journal Zootaxa, revealed that India's hidden cockroach diversity is far greater than previously recognised.The research was a collaborative effort conducted by scientists from ZSI's Western Regional Centre (Pune), Southern Regional Centre (Chennai) and Prof. Ramkrishna More College. The team generated over 100 high-quality DNA barcodes, significantly changing our understanding of these ancient insects.Scientists say cockroaches are often wrongly stereotyped only as household pests, while the majority of wild species are harmless to humans and play a crucial ecological role. Wild cockroaches help decompose organic matter, recycle nutrients into the soil and support complex forest food webs. Owing to their sensitivity to environmental changes, they also serve as important bioindicators of ecosystem health.To uncover this hidden world, researchers used DNA barcoding technology, which identifies species using short, standardised DNA sequences. By blending these modern molecular techniques with traditional taxonomy, the study resolved long-standing classification arguments and mapped out previously overlooked evolutionary lineages.The findings also suggest that some endemic lineages may have Gondwanan biogeographic origins, tracing their roots back to the time when India was part of a southern supercontinent Gondwana."The study highlights the growing power of DNA barcoding as a globally recognised tool for uncovering hidden species diversity, resolving taxonomic ambiguities, and documenting poorly known groups such as cockroaches," said Dhriti Banerjee, director of ZSI.According to lead author Shabnam, the barcode library will serve as an important reference tool for global biosecurity, agricultural pest identification, ecological monitoring and future genomic studies on Indian insects."DNA barcoding is emerging as a rapid and reliable tool for species identification, complementing conventional taxonomy, provided that reference barcode libraries are accurately validated and authenticated," said Basudev Tripathy, head of Office, ZSI, WRC, Pune.The ZSI research team noted that this study marks a significant step towards constructing a comprehensive DNA barcode reference library for India's insect population — an urgent necessity to safeguard and document the nation's rich biological heritage before it is altered by climate change and habitat loss.