The genus Megalodacne is classified in the subfamily Megalodacninae, alongside the genera Episcapha and Episcaphula.

Birgus is classified in the family Coenobitidae, alongside one other genus, Coenobita, which contains the terrestrial hermit crabs.

Standard German is a West Germanic language and is closely related to and classified alongside English, Dutch, and the Frisian languages.

In the Polynesian culture which had spread to Hawaii, the mahu were classified as a third gender of person alongside male and female persons.

Thalassinidae is classified in the infraorder Gebiidea, alongside the families Upogebiidae, Axianassidae and Laomediidae.

Kagoshima dialect is so distinctive that some have classified it as a fourth branch of Japanese, alongside Eastern, Western, and the rest of Kyushu.

Bufotenin, one of the chemicals excreted by the cane toad, is classified as a class 1 drug under Australian law, alongside heroin and cannabis.

It is aggressive and defensive than most of the species formerly classified alongside it in the genus "" Elaphe"".

Some authors have classified Calkinsia alongside Postgaardi, but Postgaardi has not been studied well enough to test this hypothesis.

It is classified alongside its closest living relative, the fanaloka, in the subfamily Euplerinae.