Cephalobium odontolateralis n. sp. (Nematoda, Cephalobiidae) is described and illustrated from the nymphs of Anurogryllus muticus (De Geer) (Orthoptera, Gryllidae) from Buenos Aires province, Argentina. It is characterized by a lateral large tooth in the stoma and by the arrangement and number of the genital papillae in the male; there are 6 pairs of postanal papillae, but none is preanal.

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