Synonymy: Napina; Pseudosolisia.
Genus: 5 species.
Region: southern Texas, Chihuahua Desert of Northeast Mexico.
Habitat: dry scrub areas.
TaxonomyNeolloydia was formerly placed in the genus Mammillaria. Since then, Neolloydia has been a dumping ground for species from such diverse genera as Mammillaria, Coryphantha, Escobaria, Echinomastus, Cumarinia, and Thelocactus. In 1977 Glass and Foster showed that there are very few botanical differences between Turbinicarpus and Gymnocactus that the definition of the genus Neolloydia began to take shape.