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Powelliphanta "Augustus".jpg
A live Powelliphanta augusta from the upper Waimangaroa River.
Scientific classification

Pilsbry, 1893

See text

  • Paryphantinae Godwin-Austen, 1893
  • Occirheneidae Iredale, 1939

Rhytididae is a taxonomic family of medium-sized predatory air-breathing land snails, carnivorous terrestrial pulmonate gastropod molluscs in the superfamily Rhytidoidea.

This family has no subfamilies.


In this family, the number of haploid chromosomes lies between 26 and 35 (according to the values in this table).[1]


This family of land snails has a range which extends from South Africa to New Guinea, some of the higher South Pacific islands, New Zealand[2] and Australia.

The New Zealand genera include Delos, Delouagapia, Paryphanta, Powelliphanta, Rhytida, Wainuia and Schizoglossa. These, however, probably do not form a monophyletic group, as indicated by their differences in their size, shape and radular morphology.[3]


Genera within the family Rhytididae include:

Life cycle[edit]

Eggs of New Zealand's species are generally deposited in leaf mould. Eggs are usually laid from late October to early December, with exception in some species as Powelliphanta spedeni in March.[4]


  1. ^ Barker G. M. (2001). Gastropods on Land: Phylogeny, Diversity and Adaptive Morphology. in Barker G. M. (ed.): The biology of terrestrial molluscs. CABI Publishing, Oxon, UK, 2001, ISBN 0-85199-318-4. 1-146, cited pages: 139 and 142.
  2. ^ Powell A. W. B. (1979). New Zealand Mollusca. William Collins Publishers Ltd, Auckland, ISBN 0-00-216906-1
  3. ^ Murray Efford, Robyn Howitt and Dianne Gleeson (September 2002). "Phylogenetic relationships of Wainuia (Mollusca : Pulmonata)—biogeography and conservation implications" (PDF). Journal of the Royal Society of New Zealand. 32 (3): 445–456. doi:10.1080/03014223.2002.9517703. Archived from the original (PDF) on 2008-09-06.
  4. ^ O'Connor A. C. (June 1945). "Notes on the Eggs of New Zealand Paryphantidae, With Description of a New Subgenus". Transactions of the Royal Society of New Zealand 75(1945-46): 54-57.

Further reading[edit]

  • Trewick, SA; et al. (2008). "Taxonomic and conservation status of a newly discovered giant landsnail from Mount Augustus, New Zealand". Conservation Genetics. 9 (6): 1563–1575. doi:10.1007/s10592-007-9495-8.
  • Walker, KJ; et al. (2008). "A new species of Powelliphanta (Mollusca: Pulmonata: Rhytididae) land snail from the Stockton Plateau, New Zealand". Journal of the Royal Society of New Zealand. 38 (3): 163–186. doi:10.1080/03014220809510553.
  • Powell A. W. B. (1930) "The Paryphantidae of New Zealand: their hypothetical ancestry, with descriptions of new species and a new genus". Records of the Auckland Institute and Museum 1: 17–56.
  • Powell A. W. B. (1938) "The Paryphantidae of New Zealand No. IV". Records of the Auckland Institute and Museum ii(3): 133–150.
  • Powell A. W. B. (1946) "The Paryphantidae of New Zealand. V. Further new species of Paryphanta, Wainuia, and Rhytida". Records of the Auckland Institute and Museum 3: 99–134.
  • Smith B. J. 1998. Family Rhytididae. In: Beesley P. L., Ross G. J. B. & Wells A. ed. Mollusca: the southern synthesis. Fauna of Australia. Vol. 5. Melbourne, CSIRO Publishing. Pp. 1091–1093.
  • Spencer H. G., Brook F. J. & Kenned M. (March 2006) "Phylogeography of Kauri Snails and their allies from Northland, New Zealand (Mollusca: Gastropoda: Rhytididae: Paryphantinae)". Molecular Phylogenetics and Evolution 38(3): 835-842. doi:10.1016/j.ympev.2005.10.015
  • Te Punga M. T. (1953) "The Paryphantidae and a Cook Strait land bridge". New Zealand Journal of Science and Technology 35: 51–63.

External links[edit]