Fonteferrea is a genus of araneoid spiders that contains only one species, Fonteferrea minutissima.[1] It is the sole member of the family Fonteferridae. The only specimen of this family was found in the Algarve in southern Portugal by Jörg Wunderlich in 2023.[2] The generic name references the locality where the holotype was collected, Fonte Ferrea, in the Faro District. They are extremely small spiders, with a body length of 0.75 mm. The species is notable for the hairs present on the tegulum, a characteristic which very few spiders have.