There are four pairs of gills, three of which are small in size while one pair is large.
Habitat & Distribution in Bangladesh:
Commonly found in the fish pond, rivers, lakes, haors, and other fresh waterbodies of Bangladesh
Environment:
Freshwater
Main References:
Ali S, Chakraborty T (1992) BANGLADESHER MITHA PANIR AMERUDANDI PRANI (A book on Freshwater Invertebrates of Bangladesh). Bangla Academy, Dhaka, Bangladesh, ISBN: 984-07-4051-12
Other References:
Das BC, Reynolds JW (2003) A checklist and distribution of the freshwater and terrestrial Annelida (Oligochaeta, Hirudinea and Polychaeta) of Bangladesh. Megadrilogica. 2003;9(10):61-70.