Taxa described in 1920

Schiedeella is a genus of flowering plants from the orchid family, Orchidaceae. It is native to the Western Hemisphere: Mexico, the West Indies and Central America, with one species (S. arizonica) in the southwestern United States (Arizona, New Mexico and Texas).

Mesadenus is a genus of flowering plants from the orchid family, Orchidaceae. It contains five currently recognized species, native to Mexico, Central America, the West Indies, and Florida. Mesadenus chiangii (M.C.Johnst.) Garay - Coahuila Mesadenus lucayanus (Britton) Schltr. - widespread across Mexico, Florida, Guatemala, West Indies Mesadenus perezii – western Mexico (Aguascalientes and Jalisco) Mesadenus polyanthus (Rchb.f.) Schltr. - Mexico, Belize Mesadenus tenuissimus (L.O.Williams) Garay - Morelos

Pierphulia is a Neotropical genus of butterflies in the family Pieridae.

Cheilophyllum is a genus of flowering plants belonging to the family Plantaginaceae. It includes eight species, seven native to Cuba and one extinct in Jamaica.

Lignosus is a genus of polypore fungi in the family Polyporaceae. The genus was circumscribed in 1920 by mycologists Curtis Gates Lloyd and Camille Torrend, with L. sacer as the type species.

Raillietina is a genus of tapeworms that includes helminth parasites of vertebrates, mostly of birds. The genus was named in 1920 in honour of a French veterinarian and helminthologist, Louis-Joseph Alcide Railliet. Of the 37 species recorded under the genus, Raillietina demerariensis, R. asiatica, and R. formsana are the only species reported from humans, while the rest are found in birds. R. echinobothrida, R. tetragona, and R. cesticillus are the most important species in terms of prevalence and pathogenicity among wild and domestic birds.

Gymnomeniidae is a family of molluscs belonging to the order Pholidoskepia.

Kathroperla is a genus of green stoneflies in the family Chloroperlidae. There are at least four described species in Kathroperla.

Anchicubaris is a genus of woodlice belonging to the family Armadillidae. This genus was described in 1920 by Walter Edward Collinge. The type specimen for this species is an Anchicubaris fongosiensis from Mt. Fongosi, South Africa. There are currently three species in this genus.

Histomonas meleagridis is a species of parasitic protozoan that infects a wide range of birds including chickens, turkeys, peafowl, quail and pheasants, causing infectious enterohepatitis, or histomoniasis (blackhead diseases). H. meleagridis can infect many birds, but it is most deadly in turkeys. It inhabits the lumen of cecum and parenchyma of liver, where it causes extensive necrosis. It is transmitted by another cecal parasite, the nematode Heterakis gallinarum.

Quadrigyrus is a genus in Acanthocephala (thorny-headed worms, also known as spiny-headed worms).

Australobius is a genus of centipedes in the family Lithobiidae. It was described by American biologist Ralph Vary Chamberlin in 1920.

The Cephaloascaceae are a family of yeasts in the order Saccharomycetales. A monotypic taxon, it contains the single genus Cephaloascus. Species in the family are distributed in Canada, Japan, and the United Kingdom, where they grow on coniferous wood or other fungi, or are associated with insects.

genus of myriapods

Camptothlipsis is a genus of insects belonging to the family Braconidae.

Pachymerellus is a genus of two species of centipedes, in the family Geophilidae. It was described by American biologist Ralph Vary Chamberlin in 1920. The smaller Mexican species, Pachymerellus dentifer, measures only 16 mm in length and has only 43 pairs of legs, whereas the larger species, P. zygethus, measures 33 mm in length and can have from 47 to 65 leg pairs.

Pterocyrtus is a genus of beetles in the family Carabidae, which was first described in 1920 by Thomas Gibson Sloane. It contains the following species:

Zelanophilus is a genus of three species of centipedes, in the family Zelanophilidae. This genus was described by American biologist Ralph Vary Chamberlin in 1920. Centipedes in this genus are found in Australia and New Zealand.

Tasmanophilus is a genus of centipedes in the family Zelanophilidae. This genus was described by American biologist Ralph Vary Chamberlin in 1920. Centipedes in this genus are found in Australia and New Zealand. This genus contains only two species.