Researchers find new crustaceans in Odisha’s Chilika Lagoon

News Excerpt:

Researchers at Odisha’s Berhampur University have discovered a new species of marine amphipod - a shrimp-like crustacea of genus Parhyale - from the state’s Chilika Lake, Asia’s biggest brackish water lagoon on India’s east coast.

  • The new species has been named ‘Parhyale odian’ after Odisha’s native language, Odia.

About the new species ‘Parhyale odian’:

  • The study revealed that the new species is brown and around eight millimetres long. 
  • It has 13 pairs of legs. The first pair of legs is used for capturing prey and feeding.
  • It differs from all other 15 species by having a stout robust seta - a spine-like structure on the surface of the propodus of the male gnathopod (first pair of legs).

About genus Parhyale: 

  • The genus Parhyale was first reported by Stebbing in 1899 from the Virgin Islands. 
  • The genus is represented by 15 species globally, occupying both marine and brackish water environments. 
  • The genus is cosmopolitan, distributed in intertidal and littoral environments along tropical and warm temperate regions. 
  • They are mostly found underneath stones with attached vegetation and also in the burrows of isopods.

About Amphipods:

  • Amphipods are a significant group in the marine ecosystem and play a vital role in the marine food chain. 
  • They also serve as indicators for studying the impact of climate change and the health of coastal ecosystems. 

Chilika Lake

  • Chilika Lake is a brackish water lake and a shallow lagoon with estuarine character spread across the districts of Puri, Khurda and Ganjam in the state of Odisha
  • Fed by 52 rivers and rivulets, the waterspread area of Chilika varies between 900 and 1165 sq. km. during summers and monsoons, respectively. 
  • The pear-shaped lagoon is about 64.5 km long, and its width varies from 5 to 18 km. 
  • It is connected to the Bay of Bengal by a 32 km long and 1.5 km wide channel that mostly runs parallel to the Bay, separated by a narrow spit whose width varies between 100 m to several kilometres.
  • The lagoon can be broadly divided into four ecological sectors based on salinity and depth: the southern zone, the central zone, the northern zone and the outer channel. 
  • A number of islands are present in the lagoon, prominent among which are Krushnaprasad, Nalaban, Kalijai, Somolo and Birds Islands.
  • A survey of the fauna at Chilika by the Zoological Survey of India in 1985-87 recorded over 800 species in and around the lagoon. 

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