A cladistic analysis of 45 ingroup and two outgroup taxa was performed on the basis of 134 characters.

Modifiers are frequently in the form of a pseudo-participial (e.g. red-whiskered bulbul), especially where there is a large number of species for that type of bird, such as the bulbuls, of which 24 species occur in South Asia.

They miscalculated by assuming the dimensions were in imperial, not metric.

For some time the presence of the diorite was unperceived, and it was considered a mere fine grained variation of the Cape Ann granitite.