A new and four known species of mononchs are described from Cameroon. Mylonchulus vulvalatus sp. nov. has 1.24-1.48 mm long body; a = 30-33; b = 3.5-4.0; c = 25.5-27.8; V = 59-60; buccal cavity 27-29 x 16-17 µm and is characterized by its blister-like vulval region. It is closely related to M. brachyuris (Bütschli, 1873) Altherr, 1953, M. parabrachyuris (Thorne, 1924) Andrássy, 1958 and M. minor (Cobb, 1893) Andrássy, 1958. Margaronchulus mulveyi Andrássy, 1972; Mylonchulus orbitus Jensen et Mulvey, 1968; Crassibucca penicula Mulvey et Jensen, 1967 and Miconchus pararapax Mulvey et Jensen, 1967 are reported. Single specimen of a Jensenonchus sp. is also described which could not be accomodated in any of the known species of the genus.
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