But it is still considered sometimes as a separate genus.

This group was placed by Frost et al. in a separate genus.

It is still under discussion whether they should be put in separate genera.

It has been suggested that they may form a separate genus.

This led subsequent authors to split them out into a separate genus.

The recent consensus has been to return to the original classification as a separate genus.

A separate genus was erected for the material in 1846 by Meyer.

Frost et al. moved it in 2006 to a separate genus.

The recent trend has been back to the original classification as a separate genus.

In 2000 it was again distinguished as a separate genus.