Other members of the family are known from fossils stretching back to the Eocene.

In addition, there are four extinct families known only from fossils.

A number of extinct species (-) are known from fossils.

It is known from fossils and many examples of prehistoric art.

The other species still assigned to this genus are only known from fossils.

The species is known only from fossils at four sites across South Island.

A further two families are known only from fossils.

Two of the commonly recognized "classes" are known only from fossils.

A further 18 species are known only from fossils.

It comprises eight families, three of which are known only from fossils.