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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 - Caenogastropoda - Heterobranchia - Family: Orbitestellidae

Orbitestellidae

 

Genus: Microdiscula

 
Microdiscula subcanaliculata (E.A.Smith, 1875)
Sub-Antarctic Islands, deep [AnE.]
 

Genus: Orbitestella

 
Orbitestella hinemoa Mestayer, 1919
Height 0.33mm, Width 1mm
Cook Strait, Fiordland, Otago, Foveaux Strait, Stewart Island, Snares and Chatham Islands [CFMAnE.]
 
Orbitestella parva (Finlay, 1924) (=vera)
Height 0.35mm, Width 0.8mm
Throughout New Zealand and southern Islands [ACFMAnE.]
 
Orbitestella toreuma Powell, 1930
Height 0.7mm, Width 0.74mm
North, South and Chatham Islands [ACFME.]