Taxa described in 1903

The Callitrichidae (also called Arctopitheci or Hapalidae) are a family of New World monkeys, including marmosets, tamarins, and lion tamarins. At times, this group of animals has been regarded as a subfamily, called the Callitrichinae, of the family Cebidae.

Callicebus is a genus of monkeys known as titi monkeys.

genus of insects

Piercolias is a Neotropical genus of butterflies in the family Pieridae. The name Piercolias was introduced by Augustus Radcliffe Grote as a replacement for Trifurcula Staudinger, 1894, which is invalid under the Principle of Homonymy.

Titanidiops is a genus of armored trapdoor spiders.

Drototelus is a genus of longhorn beetle that is endemic to New Zealand. It was first named in 1903 by T. Broun who proposed it for the species Drototelus politus. There are currently three species within the genus: D. politus, D. elegans, and D. rarus. Only 18 specimens currently exist in collections, with minimal observations in the wild.

Brontispa is a genus of beetles belonging to the family Chrysomelidae. This genus includes significant palm pest species and is recorded from South-East Asia, Australia and the Pacific islands.

Pseudevernia is a genus of foliose lichens in the family Parmeliaceae. The type species of the genus, Pseudevernia furfuracea (commonly known as tree moss), has substantial commercial value in the perfume industry.

Charidia is a genus of skippers in the family Hesperiidae.

Leucostrophus is a genus of moths in the family Sphingidae. They are large, diurnal moths native to Africa.

Theonellidae is a family of sponges belonging to the order Tetractinellida, which was first described by Robert von Lendenfeld in 1903.

Haemactis is a genus of skippers in the family Hesperiidae.

Cycloglypha is a genus of skippers in the family Hesperiidae.

The Diplectanidae are a family of monopisthocotylean monogeneans. They are all parasitic on the gills of fish (marine or freshwater). Diplectanids are small animals, generally around 1 mm in length. As parasites, they can be extremely numerous, up to several thousand on an individual fish.

Abacoleptus is a genus of beetles in the family Carabidae, containing the following species: The genus was first described by Charles Adolphe Albert Fauvel in 1903.

The Salenioida are an order of sea urchins.

Melanoblossia is a genus of African melanoblossiid camel spiders, first described by William Frederick Purcell in 1903.

Urocricetus is a genus of hamsters found on the Tibetan Plateau in southern Asia. These species have relatively long tails for a hamster, with brownish upperparts and a pure white underside.

Dichosporidium is a genus of lichen-forming fungi in the family Roccellaceae.

Acanthocotylidae is a family of parasitic flatworms in the class monogenea, a group of mostly external fish parasites.

Paraproto is a genus of marine amphipods in the family, Caprellidae, and was first described in 1903 by Paul Mayer. The type species is Paraproto condylata.

Maoriella is a genus of centipedes in the family Geophilidae. It was described by Austrian myriapodologist Carl Attems in 1903. Species in this genus are found in New Zealand, Australia, and Tahiti.

Pleurosigmataceae is a diatom family of the order Naviculales.

Leskeella is a genus of mosses in the family Leskeaceae.

Chaetodiadema is a genus of sea urchins of the Family Diadematidae. Their armour is covered with spines.

REDIRECT Pig-tailed langur

Tetraonchidae is a family of flatworms belonging to the order Dactylogyridea.

Thamnolecania is a genus of lichenized fungi in the family Ramalinaceae.