Basileostylus bollonsi , common name the New Zealand flax snail or pupuharakeke, is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Bothriembryontidae.

[2] This species is endemic to the Three Kings Islands group off the northern tip of New Zealand's North Island.

A number of subspecies were recognised; Placostylus bollonsi arbutus and P. b. bollonsi are classified by the New Zealand Department of Conservation as being Nationally Endangered, while Placostylus bollonsi caperatus is classified as Nationally Critical.

[3] Buckley et al. (2011)[4] found based on molecular phylogeny research and shell morphology research, that there are no subspecies of Placostylus bollonsi.

[4] This Bothriembryontidae-related article is a stub.