7, see text Unicorn ("one horn", in Latin) is a genus of goblin spiders (family Oonopidae) from South America, containing seven species that occur predominantly in high elevation, semi-desert regions of Bolivia, Chile, and Argentina.

Unicorn possesses several traits that suggest it is a relatively "primitive" member of the Oonopidae, and is classified with other similar, soft-bodied goblin spiders in the subfamily Sulsulinae.

The cephalothorax, yellow in color, ranges from 1 to 1.2 mm long (around 40–49% of body length depending on species) and often possesses a central grey patch with four lines radiating towards the eyes.

[1] Like most spiders, the pedipalps of mature males end in a bulb terminating in a thin, curved projection called an embolus, through which sperm is released during mating.

[3] Sperm plugs of various types, including gelatinous or waxy substances, have been observed in at least 41 spider families, and are generally thought to ensure paternity.

[5] Due to certain features of the eyes and jaws that resemble those found in other families, and which are differently modified in many other oonopids, Platnick and Brescovit suggested Unicorn was among the most primitive or basal members of the Oonopidae,[1] which was corroborated by a 2014 study that examined DNA similarities among the Oonopidae, finding that Unicorn and other sulsulines diverged before almost all other oonopids.