Rhacophytales are an extinct group of plants from the Devonian period.

Stauropteridales are an extinct group of plants in the fern division.

Varanidae contains the living genus Varanus and some extinct groups.

The family Calcitronidae is an extinct group of arachnids.

Many extinct groups are known only from sclerites, leaving moot the question of what their gross anatomy might have looked like.

Pteraspidomorphi is an extinct group of early jawless fish.

There are also a number of smaller extinct groups, mostly from the Triassic period.

The order Pygocephalomorpha is an extinct group of peracarid crustaceans.

It most often includes the extinct groups Temnospondyli and Lepospondyli.

Archaeopteryx and some other extinct groups are not included in the crown group.