It is monotypic, containing the single truffle-like species Claustula fischeri, described in 1926 and found in New Zealand and Tasmania.

In May 2016, it was one of two native New Zealand fungi added to the IUCN Red List of Threatened Species as endangered.

[3] It is monotypic, containing the single truffle-like species Claustula fischeri K.M.Curtis, which was described in 1926 by New Zealand botanist and mycologist Kathleen Curtis.

[2][8] It is found on the ground in wet native forest (Eucalyptus, Nothofagus, Leptopsermum or Kunzea) and often appears in autumn.

[4][9][10] In May 2016, it was one of two native New Zealand fungi added to the IUCN Red List of Threatened Species as endangered.