They were formerly grouped with the ioras and fairy-bluebirds in the family Irenidae.

They were formerly grouped in the families Araneidae and Tetragnathidae.

Formerly grouped in the same family due to similarities in dentition, they are no longer considered to be closely related due to genetic studies.

They were formerly grouped with the other two of those groups, the leafbirds and fairy-bluebirds, in Irenidae.

The term Old World Warblers refers to a large group of birds formerly grouped together in the bird family Sylviidae.

Iligan was formerly grouped with Lanao del Norte's 1st district.

The other orders, formerly grouped as the hypermastigids, have a large number of flagellar clusters and are found exclusively in the guts of insects.

Many populations formerly regarded as separate species are now considered a single taxon, and many formerly grouped populations have been split.

Epipremnum aureum, a plant often grown indoors (formerly grouped with the above genus)

Only a few houses were formerly grouped into congregations or are today so combined.