Some authors consider it a valid genus in itself.

The last four taxa may be valid genera and species.

At times, it has been considered dubious or a valid genus.

If it is treated as a valid genus, species include:

According to Beck, it should be treated as a valid genus.

There is some debate over whether it is actually a valid genus.

Some scientists do not believe that Sigilmassasaurus is a valid genus.

Isotrema is usually included here, but might be a valid genus.

By 1979, Pachylemur was generally accepted as a valid genus.

It was later treated as a valid genus by Larsen in 2005.