The confusion about the classification of this sponges continues nowadays, so different authors may classify them differently.

Between 1829 and 1922, different authors of 20 more descriptions classified the cat either as Felis or Leopardus.

Some authors classify modern pianos according to their height and to modifications of the action that are necessary to accommodate the height.

Accordingly, some authors classify the magnetic force as conservative, while others do not.

It can also be seen that each author chooses and classifies demons differently.

Several authors classify this people as being of the same stock as the Khaldi-Urarteans.

Increasing awareness of the differences persuaded more recent authors to classify them in separate phyla.

The authors of Phelix classify the cipher as an experimental design in its specifications.

The authors classified the studies they found into five categories: "policing", "prevention", "corrections", "court", and "community".

Some authors classify this family as a subfamily of Nymphalidae.