It was formerly the sole genus in the family.

Gastrosporium is the sole genus in the fungal family Gastrosporiaceae.

Petermannia is the sole genus of plants in the family Petermanniaceae.

There are three distinct species for the family's sole genus, Aulostomus.

It is the sole genus in the family Hepsetidae.

Gerrardina is now considered the sole genus of a separate family, Gerrardinaceae.

It is the sole genus included in the subfamily Retroculinae.

It is the sole genus of the family Torpedinidae.

It is the sole genus in the tribe Corydoradini.

Pennantia is the sole genus in the plant family Pennantiaceae.