Monotypic arachnid genera

Psoroptes is a genus of mites, including the agents that cause psoroptic mange.

Parahya submersa is a species of pseudoscorpion that resides within the monotypic family Parahyidae.

Psalenoba, is a monotypic genus of harvestmen in the family Triaenonychidae. The genus contains a single species, Psalenoba nunciaeformis. They are endemic to New Zealand.

genus of arachnids

Barrus is a monotypic genus of karschiid camel spiders, first described by Eugène Simon in 1880. Its single species, '''Barrus letourneuxi''' is distributed in Egypt.

Troglocubazomus is a monotypic genus of hubbardiid short-tailed whipscorpions, first described by Rolando Teruel in 2003. Its single species, '''Troglocubazomus orghidani''' is distributed in Cuba.

Attercopus is an extinct genus of arachnids, containing one species Attercopus fimbriunguis, known from flattened cuticle fossils from the Panther Mountain Formation in Upstate New York. It is placed in the extinct order Uraraneida, spider-like animals able to produce silk, but which lacked true spinnerets and retained a segmented abdomen bearing a flagellum-like tail resembling that of a whip scorpion. They are thought to be close to the origins of spiders.

Luisarmasius is a monotypic genus of hubbardiid short-tailed whipscorpions, first described by Reddell & Cokendolpher in 1995. Its single species, '''Luisarmasius yunquensis''' is distributed in Puerto Rico.

Nuttalliella is genus of tick. It contains a single living species, Nuttalliella namaqua found in southern Africa, having been reported from Tanzania, Namibia and South Africa, with fossil species of the genus having been reported from the mid-Cretaceous (~100 million years ago) Burmese amber of Myanmar.' It is the only living member of the family Nuttalliellidae''', and the most primitive living lineage of tick. It can be distinguished from ixodid ticks and argasid ticks by a combination of characteristics including the position of the stigmata, lack of setae, strongly corrugated integument,

REDIRECT List of Triaenonychidae species

Trinimontius is a monotypic genus of harvestman (a member of the order Opiliones) belonging to the family Cosmetidae. Its sole accepted species is Trinimontius darlingtoni. The only known species is from Cuba.

Akrav israchanani () is an extinct species of scorpions from the Ayalon Cave in Israel. It is the only species in the genus Akrav and the family Akravidae.

Fumontana is a monotypic genus of harvestman that occurs in the United States (North Carolina and Tennessee) with one described species, F. deprehendor.

Phytonemus is a monotypic genus of mites belonging to the family Tarsonemidae. The only species is Phytonemus pallidus.

Cosmiomma is a genus of ticks first discovered by Paul Schulze in 1919. It is monospecific, being represented by the single species Cosmiomma hippopotamensis. It was first described in 1843 by Henry Denny from specimens collected from a hippopotamus in Southern Africa, and has been called "one of the most unusual, beautiful, and rare tick species known to the world."

Tolus is a genus of harvestman in family Phalangodidae. The sole species Tolus appalachius, which was described based on specimens from two caves in Tennessee (United States).