Scientists have discovered a new species of marine tardigrade, Actinarctus odissi, from the shallow marine waters near Markandi coast in Odisha along the Bay of Bengal. The discovery is significant because it marks the first new species identified in the elusive Actinarctus genus in the last 43 years.
The species has been named “odissi” in honour of Odissi, the classical dance form originating from Odisha, reflecting India’s rich cultural heritage alongside scientific advancement.
About Tardigrades
Tardigrades, popularly known as “water bears” or “moss piglets”, are microscopic animals famous for their extraordinary survival abilities. Around 1,300 species of tardigrades have been identified worldwide.
They are found in almost every habitat on Earth, ranging from freshwater ecosystems and mosses to marine environments. Marine tardigrades constitute nearly 17% of all known tardigrade species.
These organisms are tiny, usually ranging from 0.05 mm to 1.2 mm in length. They possess:
- Bilateral symmetry
- Segmented bodies
- Four pairs of legs
- Claws at the end of each leg
Tardigrades feed on fluids from plant cells, bacteria and animal cells.
Features of Actinarctus odissi
The newly discovered species exhibits several unique characteristics:
- Dome-shaped body
- Transparent wing-like flaps called alae
- Shorter lateral wings compared to related species
- Blunt-tipped sensory appendages
- Simple and short sensory organs on back legs
- Distinct sculptured back with tiny trombone-shaped pillars
These features distinguish it from other members of the Actinarctus genus.
Extraordinary Survival Ability of Tardigrades
Tardigrades are globally known for surviving extreme environmental conditions such as:
- Extreme heat
- Freezing temperatures
- High radiation
- Vacuum of outer space
- Severe dehydration
Under unfavourable conditions, they enter a suspended animation stage called the “tun” state”. In this condition:
- The body dries and contracts into a lifeless ball-like form
- Metabolism reduces to nearly 0.01% of normal activity
- They can survive for years or even decades
This remarkable adaptation makes tardigrades one of the toughest life forms on Earth.
Significance of the Discovery
Biodiversity Conservation
The discovery highlights the rich and largely unexplored marine biodiversity of the Bay of Bengal and India’s eastern coastline.
Scientific Importance
Studying tardigrades can help scientists understand mechanisms of:
- Extreme survival
- Radiation resistance
- Cellular repair systems
- Long-term biological preservation
Space and Biotechnology Research
Tardigrades are studied extensively in astrobiology because of their ability to survive space-like conditions. Their biological mechanisms may contribute to advancements in:
- Space exploration
- Medicine
- Cryopreservation
- Biotechnology
Challenges to Marine Biodiversity
- Marine pollution
- Coastal habitat destruction
- Climate change
- Ocean acidification
- Rising sea temperatures
These factors threaten microscopic marine organisms and fragile ecosystems.
Way Forward
India should strengthen marine biodiversity research, coastal ecosystem conservation and taxonomic studies. Greater investment in marine science and deep-sea exploration can improve understanding of hidden aquatic life and support biodiversity conservation efforts.
The discovery of Actinarctus odissi showcases India’s growing contribution to global scientific and biodiversity research.