Six species of nonmazocraeid monogeneans including two new species from clupeiform fishes of Visakhapatnam coast, Bay of Bengal.

During a survey on monogenean parasites of clupeiform fishes of Visakhapatnam coast, Bay of Bengal, apart from typical mazocraeids, 6 species of nonmazocraeids, including two new species were encountered. These belonged to 5 genera distributed over 4 families: Family Gastrocotylidae: from ; n.sp. from ; from ; family Megamicrocotylidae: from ; family Microcotylidae: n.sp. from and family Diclidophoridae: from n. sp. differs from in the larger body size, in the relatively smaller size of haptor and also in the number of clamps and alignment of reproductive organs. n.sp. the first species of the genus to be reported from clupeiform fishes differs from other species of the genus, mainly in the presence of a circlet of spines on the oral sucker. Descriptions are provided for all the species collected. is synonymized with . .