Monotypic nematode genera

Ingenia is a genus of marine nematode worms native to Brazil, with a single known species, I. mirabilis. It belongs to the Tripyloididae, which is a group that are mostly free-living and which feed on diatoms and other algaes.

Dioctophyme is a monotypic genus of nematodes belonging to the family Dioctophymidae. The only species is Dioctophyme renale. Much older literature uses the alternative spelling "Dioctophyma" and the family name "Dioctophymatidae" but these alternative spellings were suppressed by the ICZN in a 1987 ruling.