The suctorian ciliates, Thecacineta cothurnioides and Trematosoma rotunda, belonging to the families Thecacinetidae and Acinetidae, were recorded as prominent epibionts on the cuticle of a marine free-living nematode, Chromaspirina sp. (Desmodoridae) from shallow sediments of the continental shelf of the Bay of Bengal. The biometrics of these suctorians arecompared with literature data, and their species-specific association with nematodes is discussed.