The present work is a compilation of the systematics of the two rare genera of Diphtherophoridae including Longibulbophora (with two species; L. ammophilae and L. rotundicauda) and Brachynemella (with one species; B. obtusa). Morphometric data, descriptions of females and males, relationships with close species, and distribution (associated plants and locality) of the three species are discussed. Furthermore, photomicrographs are provided for type specimens of L. ammophilae. The family Diphtherophoridae should be reassigned to include only two genera, namely Diphtherophora and Tylolaimophorus. The position of amphid apertures and the presence of prerectum exclude the genus Brachynemella from the family Diphtherophoridae. The genus Longibulbophora is no longer justified as a valid taxon, as L. rotundicauda, the type species, should be considered as species et genera indeterminate, and the second species, L. ammophilae, is proposed here to be a member of the genus Diphtherophora.