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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.
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
E =
Endemic
I =
Introduced
Gastropoda - Pulmonata - Hygrophila - Family: Planorbidae

Planorbidae

 

Genus: Gyraulus

 
Gyraulus corinna Gray, 1850
Length 3.3mm, Width 2.6mm, Height 0.8mm, Four slowly increasing whorls
North and South Island [FW.N.S.E.]
 
Gyraulus kahuica Finlay & Laws, 1931
Length 6mm, Width 5mm, Height 1.75mm, Much larger than G.corinna, 3.9-6.0 mm in diameter, yet with only 3-3.5 whorls, which are more accellerated
North and South Island [FW.N.S.E.]
 

Genus: Planorbarius

 
Planorbarius corneus (Linnaeus, 1758)
Introduced
North Island [FW.N.I.]
 

Genus: Segmentina

 
Segmentina complanata (Linnaeus, 1758)
Height 1mm, Width 4mm, Introduced
North Island, New Plymouth [FW.N.I.]
 

Planorbidae: Ancylinae

 

Genus: Ferrissia (Kincaidilla)

 
Ferrissia (Kincaidilla) dohrnianus (Clessin, 1882) (=lucasi Suter)
Length 4mm, Width 2.5mm, Height 1.5mm
North Island, attached to stems and underside of leaves of aquatic plants in quiet waters [FW.N.S.E.]
 
Length 3mm, Width 2mm, Height 0.75mm
South Island [FW.S.E.]