Aphanostoma orphinum Marcus, 1950 accepted as Pseudokuma orphinum (Marcus, 1950) (original description)
Childia pansa Marcus, 1950 accepted as Childia groenlandica (Levinsen, 1879) (original description)
Convoluta divae Marcus, 1950 accepted as Conaperta divae Marcus, 1950 accepted as Isodiametra divae (Marcus, 1950) accepted as Aphanostoma divae (Marcus, 1950) (original description)
Cylindrostoma ibeenum Marcus, 1950 (original description)
Cylindrostoma netsicum Marcus, 1950 (original description)
Cylindrostoma triste (Graff, 1911) Jones, 1939 (taxonomy source)
Dolichomacrostomum mortenseni Marcus, 1950 accepted as Austromacrostomum mortenseni (Marcus, 1950) (original description)
Haploposthia microphoca Marcus, 1950 (original description)
Kata leroda Marcus, 1950 (original description)
Kuma Marcus, 1950 (original description)
Kuma brevicauda Marcus, 1950 (original description)
Lurus Marcus, 1950 (original description)
Lurus evelinae Marcus, 1950 (original description)
Microstomum gabriellae Marcus, 1950 (original description)
Microstomum trichotum Marcus, 1950 (original description)
Microstomum ulum Marcus, 1950 (original description)
Monocelis tabira Marcus, 1950 (original description)
Monoophorum tigacum Marcus, 1950 (original description)
Necia Marcus, 1950 (original description)
Necia sopha Marcus, 1950 (original description)
Nematoplana asita Marcus, 1950 (original description)
Paraphanostoma westbladi Marcus, 1950 accepted as Childia westbladi (Marcus, 1950) (original description)
Paraproporus xanthus Marcus, 1950 (original description)
Peraclistus itaipus Marcus, 1950 (original description)
Peraclistus oophagus (Friedmann, 1924) (additional source)
Philosyrtis eumeca Marcus, 1950 (original description)
Pilgramilla sphagnorum Sekera, 1911 (additional source)
Promonotus erinaceus Marcus, 1950 (original description)
Proschizorhynchus atopus Marcus, 1950 accepted as Schizorhynchoides atopus (Marcus, 1950) L'Hardy, 1965 accepted as Proschizorhynchella atopa (Marcus, 1950) Karling, 1989 (original description)
Pseudoceros limbatus Haswell, 1907 accepted as Pseudoceros liparus Marcus, 1950 (replacement name source)
Pseudoceros liparus Marcus, 1950 (replacement name source)
Puzostoma Marcus, 1950 (original description)
Puzostoma evelinae Marcus, 1950 (original description)
Rosmarium Marcus, 1950 (original description)
Rosmarium evelinae Marcus, 1950 (original description)
Schizorhynchoides martae Marcus, 1950 accepted as Schizochilus martae (Marcus, 1950) Boaden, 1963 (original description)
Tabaota Marcus, 1950 (original description)
Tabaota curiosa Marcus, 1950 (original description)

Brazil for Amphiscolops sargassi Hyman, 1939 
Brazil for Aphanostoma orphinum Marcus, 1950 
Brazil for Avagina marci Dörjes & Karling, 1975 
Brazil for Childia pansa Marcus, 1950 
Brazil for Childia westbladi (Marcus, 1950) 
Brazil for Childia westbladi (Marcus, 1950) 
Brazil for Childia westbladi (Marcus, 1950) 
Brazil for Convoluta divae Marcus, 1950 
Brazil for Cylindrostoma ibeenum Marcus, 1950 
Brazil for Cylindrostoma netsicum Marcus, 1950 
Brazil for Dolichomacrostomum mortenseni Marcus, 1950 
Brazil for Haploposthia microphoca Marcus, 1950 
Brazil for Kata leroda Marcus, 1950 
Brazil for Kuma brevicauda Marcus, 1950 
Brazil for Lurus evelinae Marcus, 1950 
Brazil for Macrostomum evelinae Marcus, 1946 
Brazil for Mecynostomum tenuissimum (Westblad, 1946) 
Brazil for Mecynostomum tenuissimum (Westblad, 1946) 
Brazil for Mesoda gabriellae Marcus, 1949 
Brazil for Mesoda gabriellae Marcus, 1949 
Brazil for Microstomum gabriellae Marcus, 1950 
Brazil for Microstomum gabriellae Marcus, 1950 
Brazil for Microstomum trichotum Marcus, 1950 
Brazil for Microstomum ulum Marcus, 1950 
Brazil for Monocelis tabira Marcus, 1950 
Brazil for Monocelis tabira Marcus, 1950 
Brazil for Monoophorum tigacum Marcus, 1950 
Brazil for Necia sopha Marcus, 1950 
Brazil for Necia sopha Marcus, 1950 
Brazil for Necia sopha Marcus, 1950 
Brazil for Nematoplana asita Marcus, 1950 
Brazil for Paraproporus xanthus Marcus, 1950 
Brazil for Peraclistus itaipus Marcus, 1950 
Brazil for Philosyrtis eumeca Marcus, 1950 
Brazil for Promonotus erinaceus Marcus, 1950 
Brazil for Proschizorhynchella atopa (Marcus, 1950) Karling, 1989 
Brazil for Proschizorhynchus atopus Marcus, 1950 
Brazil for Puzostoma evelinae Marcus, 1950 
Brazil for Rosmarium evelinae Marcus, 1950 
Brazil for Schizorhynchoides martae Marcus, 1950 
Brazil for Tabaota curiosa Marcus, 1950