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Plankton samples collected from Deepor Beel, a Ramsar site of India, during August 2008-July 2010, revealed six rare and interesting Cladocera belonging to four genera of the family Chydoridae. The globally important elements include the Australasian Disperalona caudata; the Asian Kurzia (Rostrokurzia) brevilabris; the Indo-Malayan Alona macronyx; and Leydigiopsis curvirostris which is known to occur elsewhere in North and South America. Kurzia (Rostrokurzia) brevilabris is a new record from India while Alona guttata tuberculata, A. macronyx and Coronatella anodonta are new records from Assam. The documented species are briefly diagnosed and comments are made on their distribution.