Cirrifera aculeata (Ax, 1951) (additional source)
Coelogynopora aculeata Ax, 1951 accepted as Cirrifera aculeata (Ax, 1951) (original description)
Coronhelmis lutheri Ax, 1951 (original description)
Halammovortex macropharynx (Meixner, 1938) Karling, 1943 (additional source)
Kataplana germanica (Meixner in Ax, 1951) (original description)
Macrostomum pusillum Ax, 1951 (original description)
Macrostomum rubrocinctum Ax, 1951 (original description)
Monocelopsis Ax, 1951 (original description)
Monocelopsis otoplanoides Ax, 1951 (original description)
Otoplana schulzi Ax, 1951 accepted as Otoplanella schulzi (Ax, 1951) (original description)
Otoplana subterranea Ax, 1951 accepted as Pseudosyrtis subterranea (Ax, 1951) (original description)
Philosyrtis germanica Meixner, 1938 accepted as Kataplana germanica (Meixner in Ax, 1951) (source of synonymy)
Phonorhynchus bitubatus Meixner, 1938 (additional source)
Promesostoma bilineatum Pereyaslawzewa, 1892 (additional source)
Promesostoma gracilis Ax, 1951 accepted as Promesostoma gracile Ax, 1951 (original description)
Promesostoma meixneri Ax, 1951 (original description)
Promesostoma rostratum Ax, 1951 (original description)
Promonotus schultzei Meixner, 1943 (additional source)
Provortex karlingi Ax, 1951 (original description)
Provortex psammophilus Ax, 1951 (original description)
Ptyalorhynchus Ax, 1951 (original description)
Ptyalorhynchus coecus Ax, 1951 (original description)
Schizorhynchoides rarus Ax, 1951 (original description)
Vejdovskya ignava Ax, 1951 (original description)