Taxa described in 1919

Alcaligenes is a genus of Gram-negative, aerobic, rod-shaped bacteria in the order of Burkholderiales, family Alcaligenaceae.

Ophiostoma is a genus of fungi within the family Ophiostomataceae. It was circumscribed in 1919 by mycologists Hans Sydow and Paul Sydow.

Psorothamnus is a genus of plants in the legume family. These are shrubs and small trees. Many are known by the general common name indigo bush. Some are referred to as daleas, as this genus was once included in genus Dalea. These are generally thorny, thickly branched, strongly scented bushes. Most species bear lupinlike raceme inflorescences of bright purple legume flowers and gland-rich pods. Psorothamnus species are native to the southwestern United States and northern Mexico.

Quedara is a genus of grass skipper butterflies in the family Hesperiidae. The genus was established by Charles Swinhoe in 1919.

Sphyriidae is a family of marine copepods in the order Siphonostomatoida.

Xenonectriella is a genus of lichenicolous fungi in the family Nectriaceae. The genus was circumscribed by lichenologist Josef Karl Weese in 1919, with Xenonectriella lutescens assigned as the type species.

Appendiculella is a genus of fungi in the family Meliolaceae. About 70 species are accepted in 2020.

Lichenopeltella is a genus of fungi in the family Microthyriaceae. It comprises about 50 species. The genus was established in 1919 by the mycologist Franz Xaver Rudolf von Höhnel, and its classification within fungal families has been revised several times as scientists better understand its relationships. Nearly all species in the genus are specialized parasites that live on lichens rather than forming lichens themselves, often targeting specific host species. These fungi are found worldwide and are recognized by their tiny, shield-like fruiting bodies that develop on the surface of their li

Keissleriella is a genus of fungi, that was originally placed in the Massarinaceae family, before being placed in the Lentitheciaceae family.

Aediodina is a genus of moths of the family Crambidae. It contains only one species, Aediodina quaternalis, which is found on Ambon Island and Taiwan.

Catancyla is a genus of moths of the family Crambidae. It contains only one species, Catancyla brunnea, which is found in Australia, where it has been recorded from Western Australia.

Sonatsa is a genus of marine, mud-dwelling polychaete worms containing the sole species Sonatsa meridionalis. S. meridionalis was described in 1919 by Ralph Vary Chamberlin from a single specimen collected by the research ship USS Albatross during a 1904–05 survey of the southeast Pacific Ocean. The type specimen was collected between Peru and the Galapagos Islands, from muddy sediment at a depth of around 4 km. The name Sonatsa derives from the Goshute words soma, meaning "many", and natsani, meaning "hook", while the specific name meridionalis is Latin for "southern".

Pleurothecium is a genus of terrestrial and freshwater fungi in the family Pleurotheciaceae. It is typified by Pleurothecium recurvatum as the type species , which has the synonym of Carpoligna pleurothecii , Mycologia 9: 253. 1999.