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Taxonomy
Family:
HYDROCENIDAE
Full Classification:
Mollusca (Phylum)
> Gastropoda (Class)
> Neritimorpha (Subclass)
> Cycloneritida (Order)
> Hydrocenoidea (Superfamily)
> Hydrocenidae (Family)
> Georissa (Genus)
> purchasi (Species)
Genus Synonyms:
=Chondrella Pease, 1871
=Georissa (Chondrella) Pease, 1871
=Georissa (Georissa) W.T. Blanford, 1864
=Georissa (Georissopsis) Pilsbry & Hirase, 1908
=Omphalorissa Wenz, 1938
=Petrorissa Habe, 1958
Synonymised Names:
=Hydrocena purchasi L. Pfeiffer, 1861
=Omphalorissa purchasi (L. Pfeiffer, 1862)
Images: Georissa purchasi (L. Pfeiffer, 1862)
Waiwhetu, Haywards Easter Hills Scenic Reserve, Lower Hutt, Wellington, NZ. 1.9mm. Reproduced courtesy of iNaturalist.nz ©openlabnz (D.J.Roscoe)
Top view - Waiwhetu, Haywards Easter Hills Scenic Reserve, Lower Hutt, Wellington, NZ. 1.9mm. Reproduced courtesy of iNaturalist.nz ©openlabnz (D.J.Roscoe)
Base view - Waiwhetu, Haywards Easter Hills Scenic Reserve, Lower Hutt, Wellington, NZ. 1.9mm. Reproduced courtesy of iNaturalist.nz ©openlabnz (D.J.Roscoe)
Taxonomy
Family:
HYDROCENIDAE
Full Classification:
Mollusca (Phylum)
> Gastropoda (Class)
> Neritimorpha (Subclass)
> Cycloneritida (Order)
> Hydrocenoidea (Superfamily)
> Hydrocenidae (Family)
> Georissa (Genus)
> purchasi (Species)
Genus Synonyms:
=Chondrella Pease, 1871
=Georissa (Chondrella) Pease, 1871
=Georissa (Georissa) W.T. Blanford, 1864
=Georissa (Georissopsis) Pilsbry & Hirase, 1908
=Omphalorissa Wenz, 1938
=Petrorissa Habe, 1958
Synonymised Names:
=Hydrocena purchasi L. Pfeiffer, 1861
=Omphalorissa purchasi (L. Pfeiffer, 1862)
Details: Georissa purchasi (L. Pfeiffer, 1862)
Size/Grows to:
Height 2.0mm, Width 1.0mm
Distribution:
North and South Islands, and Three Kings Islands
Geographical Range:
L.N.S.
Notes:
Land
Distribution Map
 
References and Publications
  • Goulstone, J.F., Mayhill, P.C., Parrish, G.R. 1993 An Illustrated Guide to the Land Mollusca of the Te Paki ecological region, Northland, New Zealand, New Zealand Journal of Zoology, 34 (p.6)
  • Powell, A.W.B. 1979 New Zealand Mollusca: Marine, Land and Freshwater Shells, Collins, Auckland (p.80)

Key to Geographical Ranges
NZ Map showing 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 approximation of the range of each species within New Zealand.
K=
Kermadec Islands
A=
Aupourian - Kaipara Harbour, north around North Cape, encompassing the Three Kings Islands and south to East Cape
C=
Cookian - Lower North Island and the northern part of the South Island
F=
Forsterian - Otago, Fiordland and Stewart Island
M=
Moriorian - Chatham Islands, Pitt Island
An=
Antipodean - Subantarctic Islands of New Zealand
Fw =
Freshwater
L =
Land
N =
North Island
S =
South Island
R =
Recent
Sf =
Subfossil
Fo =
Fossil
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