Species Images
A small limpet-like gastropod. 7mm
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 =

Williamia radiata nutata (Hedley, 1908)

Classification:Mollusca (Phylum) > Gastropoda (Class) > Heterobranchia (Subclass) > Siphonariida (Order) > Siphonarioidea (Superfamily) > Siphonariidae (Family) > Williamia (Genus)
Size/Grows to:Height 7mm, Width 5mm
Synonyms:(=Roya Iredale)
(=kermadecensis Iredale)
Distribution:Northland NZ and Kermadec Islands
Geographical Range:KA
References and Publications:
  • Brook, F.J., Marshall, B.A. 1998: The coastal molluscan fauna of the northern Kermadec Islands, southwest Pacific Ocean, Journal of the Royal Society of New Zealand, 28 (p.232)
  • Marshall, B.A. 1981: The genus Williamia in the western Pacific (Mollusca: Siphonariidae), New Zealand Journal of Zoology, 8(4) (p.488)
  • Powell, A.W.B. 1979: New Zealand Mollusca: Marine, Land and Freshwater Shells, Collins, Auckland (p.65)
  • Gardner, N.W. Dec/1977: Roya kermadecensis Iredale, 1912, Poirieria, 9(3) (p.43)
  • Powell, A.W.B. 1976: On the considerable influx of warm water molluscs that have invaded northern New Zealand waters within recent years, Records of the Auckland Institute and Museum, 13 (p.142)
  • Iredale, T. 1912: New generic names and new species of marine Mollusca, Proceedings of the Malacological Society of London, 10(3) (p.218)

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

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