Species Images
Holotype of Potamopyrgus cresswelli Climo, 1974, collected 18 Jan 1970, Paterson Inlet, small seepage in coastal forest at head of streamlet entering W end of Golden Bay, NZ. (M.032562). 2.3mm. © Museum of New Zealand Te Papa Tongarewa CC BY-NC-ND
Key to Geographical Ranges
The symbols K.A.C.F.M.An. are used to indicate the geographical range of the species. They have been adopted to give an approxomation of the range of each species within New Zealand.
Kermadec Islands
Aupourian - Kaipara Harbour, north around North Cape, encompassing the Three Kings Islands and south to East Cape
Cookian - Lower North Island and the northern part of the South Island
Forsterian - Otago, Fiordland and Stewart Island
Moriorian - Chatham Islands, Pitt Island
Antipodean - Subantarctic Islands of New Zealand
FW =
L =
N =
North Island
S =
South Island
E =
I =

Rakiurapyrgus cresswelli (Climo, 1974)

Classification:Mollusca (Phylum) > Gastropoda (Class) > Caenogastropoda (Subclass) > Littorinimorpha (Order) > Truncatelloidea (Superfamily) > Tateidae (Family) > Rakiurapyrgus (Genus)
Size/Grows to:Height 2.5mm
Distribution:Stewart Island
Freshwater, South Island, Endemic. In springs and seepage
References and Publications:
  • Haase, M. 2008: The radiation of hydrobiid gastropods in New Zealand: a revision including the description of new species based on morphology and mtDNA sequence information, Systematics and Biodiversity, 6(1) (p.151)
  • Powell, A.W.B. 1979: New Zealand Mollusca: Marine, Land and Freshwater Shells, Collins, Auckland (p.122)
  • Climo, F.M. 1977: Notes on the New Zealand hydrobiid fauna (Mollusca: Gastropoda: Hydrobiidae), Journal of the Royal Society of New Zealand, 7(1) (p.73)

Note: Localities are approximate, and represent only some of the known localities for the species.