1921 in paleontology explained

Plants

Newly named angiosperms

Arthropods

Newly named insects

Dinosaurs

Newly named dinosaurs

Data courtesy of George Olshevsky's dinosaur genera list.^[4]

Synapsids

Non-mammalian

Name	Status	Authors	Age	Unit	Location	Notes	Images
Anteosaurus	Valid	Watson	Middle Permian	Tapinocephalus Assemblage Zone		A member of Dinocephalia.	<	-- -->
Emyduranus	Junior synonym	Broom	Late Permian	Cistecephalus Assemblage Zone		A junior synonym of Pristerodon.
Leptotrachelus	Junior synonym	Broom	Middle Permian	Tapinocephalus Assemblage Zone		Junior synonym of Gorgonops^[6]
Palemydops	Valid	Broom	Late Permian	Cistecephalus Assemblage Zone		A dicynodont.

References

1. Manchester . S.R. . 1992 . Flowers, fruits and pollen of Florissantia, an extinct malvalean genus from the Eocene and Oligocene of western North America . American Journal of Botany . 79 . 9 . 996–1008 . 10.2307/2444909 . 2444909 .
2. Cockerell . T. D. A. . 1921 . Some Eocene insects from Colorado and Wyoming. . Proceedings of the United States National Museum . 59 . 29-39.
3. Carpenter . F. M. . 1930 . The fossil ants of North America. . Bulletin of the Museum of Comparative Zoology . 70 . 1-66 .
4. Web site: Olshevsky . George . Dinogeorge's Dinosaur Genera List . 2008-08-07 . 2011-07-15 . https://web.archive.org/web/20110715102453/http://www.polychora.com/dinolist.html . dead .
5. Andrews, C.W. 1921. On some remains of a theropodous dinosaur from the lower Lias of Barrow-on-Soar. Arm. Mag. Nat. Hist. (ser. 9) 8:pp. 570-576.
6. Carroll, R. L. Vertebrate Paleontology and Evolution. W. H Freeman Company, 1988.