Until 2007, it was believed to be monotypic, with T. rapicauda the sole species.

It is the sole species in the genus Leucosidea.

It is probably the sole species of the genus Alchorneopsis.

Upon their defeat, the dragons vanished from the world and man began to flourish as the sole dominant species.

"The Merseians aren't the sole species in it, and members of some others have been influential from time to time."

Meanwhile, our long reign as the sole human species on Earth appears to be shorter than we thought.

It has recently been considered the sole species in the subgenus Hyrcanicola.

They are currently the sole species of the genus Crenadactylus.

It is the sole species of the genus Vogesella.

It is the sole species classified under the genus Rhinogobiops.