New Marine Nematode Species Discovered off Tamil Nadu Coast

Researchers from the Zoological Survey of India (ZSI) have recently identified two new species of free-living marine nematodes off the coast of Tamil Nadu. Named “Corononema dhriti” and “Epacanthion indica”, these discoveries highlight India’s rich yet understudied marine biodiversity and contribute to global taxonomic knowledge.

Discovery and Naming of New Species

“Corononema dhriti” has been named in honour of Dr Dhriti Banerjee, Director of ZSI. It is only the fourth known species of its genus worldwide, previously reported from Australia, Thailand, and Vietnam. “Epacanthion indica”, named after India, stands out due to its anatomical complexity and unique ecological role within marine ecosystems.

Unique Features of the Species

“Corononema dhriti” is a free-living marine nematode adapted to benthic environments. In contrast, “Epacanthion indica” possesses specialised mandibles and tooth-like structures, making it a microscopic predator. Unlike many nematodes that feed on microbes, this predatory adaptation places it higher in the benthic food web, indicating ecological diversity among nematodes.

Understanding Nematodes

Nematodes are worms belonging to the phylum Nematoda. They may exist as parasites in plants and animals or as free-living organisms in soil, freshwater, and marine ecosystems. Structurally, they are bilaterally symmetrical, elongated, and tapering at both ends. Some species possess a pseudocoel, a fluid-filled body cavity between the digestive tract and body wall. They are among the most widely distributed organisms, found across all continents, including extreme environments such as deserts and Antarctica.

Important Facts for Exams

• “Corononema dhriti” is the fourth known species of its genus globally.
• “Epacanthion indica” is a predatory marine nematode with specialised mandibles.
• Nematodes belong to the phylum Nematoda and may be parasitic or free-living.
• They are found in diverse habitats, including extreme environments.

Ecological Significance of Marine Nematodes

Marine nematodes play a crucial role in maintaining ocean health. They contribute to nutrient cycling by decomposing organic matter and recycling essential nutrients. They also support sediment stability and productivity in coastal ecosystems. Additionally, they act as bio-indicators, helping scientists monitor environmental changes and assess the impacts of climate change on marine ecosystems.