Monotypic Eurotiomycetes genera

Bettsia is a genus of fungi within the Ascosphaeraceae family. This is a monotypic genus, containing the single species Bettsia alvei. Alvei was first described by Annie Betts and this genus is named for her.

Byssoonygena is a genus of fungi within the Onygenaceae family. It is a monotypic genus, containing the single species Byssoonygena ceratinophila.

Xanthothecium is a genus of fungi within the Onygenaceae family. This is a monotypic genus, containing the single species Xanthothecium peruvianum.

Pectinotrichum is a genus of fungi within the Onygenaceae family. This is a monotypic genus, containing the single species Pectinotrichum llanense.

Monascella is a genus of fungi within the Onygenaceae family. This is a monotypic genus, containing the single species Monascella botryosa.

Polytolypa is a monotypic genus of fungus containing the single species Polytolypa hystricis. First classified in the Onygenaceae family, as of 2008 it is considered to be in the Ajellomycetaceae, although there is still uncertainty as to its phylogenetic relationships with other similar genera. This species is only known from a single specimen derived in the laboratory from a specimen of dung of the North American porcupine, Erethizon dorsatum, collected in Ontario, Canada. Polytolypa hystricis contains bioactive compounds that have antifungal activity.