The family is monotypic, having a single genus, with seven species.

Within that family they are placed in a single genus, Menura.

Until recently, they were all classified in the single genus Hippolais.

It is a very small family, consisting of a single genus with four species.

The family contains the single genus Uleiella, which has two species.

The class is a small one, with only three known families, each containing a single genus.

The family contains a single genus, Hemiprocne, with four species.

It has only a single genus, containing four to six species.

The class contains three recognized orders, each with a single genus.

There are 600 described species of this single genus.