Dolops intermedia Silva, 1978 (Crustacea: Argulidae) was described from Rio Grande do Sul state in the southernmost state of Brazil. Here, we report a new occurrence of this species from Maranhão state, 1 of the northernmost states of Brazil. The infection of new hosts Colossoma macropomum (Cuvier, 1816), Oreochromis niloticus (Linnaeus, 1758), Hoplias malabaricus (Bloch, 1794), Leporinus friderici (Bloch, 1794), and Pygocentrus nattereri (Kner, 1858) is reported for the first time. Additional morphological information is provided for some structures, and the ratios for body measurements are provided for the first time.