[3] The holotype specimen is held at the National Museum of New Zealand Te Papa Tongarewa.

[3] P. oppidanus is endemic to New Zealand and has only be found on Te Ahumairangi Hill in the town belt of Wellington.

[3] P. oppidanus lives in damp shaded areas in undisturbed leaf litter, stones and woody detritus.

[2] P. oppidanus has also been classified by the International Union for Conservation of Nature (IUCN) as critically endangered.

It has been argued that the building of illegal mountain bike tracks through its habitat is having a detrimental effect on its survival.