Up to nine tribes are accepted by various authors; others however synonymize some of these.

More recent studies tend to synonymize the species again with R. africana.

Hence, whether to keep or to synonymize it is entirely a matter of philosophy, as the scientific facts would agree with either approach.

However, many recent authors synonymize this genus with Diplomystes.

Despite the tendency of some sources to synonymize it with Agaricus semotus, this is a distinct taxon.

However, due to the fragmentary nature of the Manospondylus vertebrae, Osborn did not synonymize the two genera.

Although some people synonymize "polymerous" with "double," some polymerous flowers have over five times the normal number of petals.

And if one does not synonymize "Verismo" with "bloodshed," one could postulate that Puccini gave us the most perfect "realistic" opera in 'La Bohème'.

Although there was a push to synonymize it with Polacanthus in the late 1980s-early 1990s, Hoplitosaurus has been accepted as a valid albeit poorly-known genus in more recent reviews.

On the other hand, it might be even more practical to synonymize the Asiloidea with the Asilomorpha and place the asiloid families in the infraorder directly, following the example of the Tabanomorpha.

He did not synonymize the two species because of difficulties with the holotype skull of H. houi, instead considering new combination P. houi a nomen dubium within Psittacosaurus.

Rose concludes that, as Astrodon is not based on the diagnostic material, "new discoveries should not be aligned with that genus" and that "the argument to synonymize the two taxa, Astrodon and Pleurocoelus, seems unfounded".

Matthew and Brown commented in 1922 that these teeth were indistinguishable from those of Gorgosaurus, but in the absence of skeletal remains of Deinodon, opted not to unequivocally synonymize the two genera, provisionally naming a ?

More recently, however, it was revealed that SGM-Din-3, which was used to synonymize Carcharodontosaurus and "Spinosaurus B" was not actually associated with SGM-Din-1, the Carcharodontosaurus skull described in 1996, and shows clear differences with the holotype of Carcharodontosaurus.

This possibly led Francis Day to synonymise C. diplogramma with C. micropeltes in 1878.

Although several attempts have been made to synonymise many of the proposed names, the taxonomic position of West African jackals, in particular, is too confused to come to any precise conclusion, as the collected study materials are few.