They were once considered a subspecies of the Western toad.

In the past, both were considered subspecies of the gemsbok.

It had once been considered a subspecies of the P. badius.

This population is often considered a subspecies of T. vulpecula.

It has sometimes been considered a subspecies of T. flavescens.

It was previously considered a subspecies of the Western toad.

Up until 2004 the Malayan tiger wasn't considered a subspecies in its own right.

Species of Buthacus are very similar to each other and have been considered subspecies in some examples.

The two taxa were considered subspecies of a single species, before being split.

It is sometimes considered a subspecies of the Alpine ibex.