Taxa described in 2021

Eumillipes is a genus of millipede in the family Siphonotidae. This genus contains a single species, Eumillipes persephone, known from the Eastern Goldfields of Western Australia. This millipede can have as many as 1,306 legs, which makes this species the animal with the most legs on Earth and the first millipede discovered to have 1,000 legs or more.

Kariridraco is a genus of thalassodromid pterosaur from the Early Cretaceous-aged Romualdo Formation, Brazil. The genus contains a single species, Kariridraco dianae.

Trolicaphyllium is a genus of leaf insect in the order Phasmatodea native to New Caledonia and the small surrounding islands. The species listed in this genus were listed in Chitoniscus until 2021, whose representatives originate from the Fiji Islands. thumb|Wing venation of a male of Trolicaphyllium cf. brachysoma == Description == Trolicaphyllium species are relatively small and broad representatives of leaf insect, with a body length of in females and in males. Their abdomen is either pointed or strongly lobed in both sexes. Their eggs are small and lack pinnae. In these morphological chara

Temnocephalidae is a family of flatworms belonging to the order Rhabdocoela, and was first described in 2021 by Van Steenkiste, Rivlin, Kahn, Wakeman & Leander.

Armatimonadota is a phylum of gram-negative bacteria.