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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
E =
Endemic
I =
Introduced
Gastropoda - Vetigastropoda - Colloniidae:
Colloniidae
 
Genus: Argalistamap >
Argalista crassicostata (Murdoch, 1905)
Width 3.2mm, Height 2.5mm, Endemic
South Island. Foveaux Strait and Stewart Island, Snares Islands [FAn]
Argalista fluctuata (Hutton, 1883)
Height 2.25mm, Width 3.0mm, Endemic
North, South, Stewart, Chatham and Southern Islands [ACFMAn]
Argalista imperforata (Suter, 1908)
Height 3.05mm, Width 3.5mm, Endemic
North, South and Stewart Island [ACF]
Argalista micans (Powell, 1931)
Height 1.13mm, Width 1.43mm, Endemic
Snares and Auckland Islands [An]
Argalista nana (Finlay, 1930)
Height 0.9mm, Width 2.5mm, Endemic
Three Kings Islands to Northland [A]
Argalista rotella (Powell, 1937)
Height 1.1mm, Width 1.6mm, Endemic
Off Three Kings Islands [A]
Argalista umbilicata (Powell, 1926)
Height 1.9mm, Width 2.75mm, Endemic
Off South Island and southern islands [CFMAn]
Argalista variecostata (Powell, 1937)
Height 1.8mm, Width 2.3mm, Endemic
Off Three Kings Islands [A]
Genus: Cantraineamap >
Cantrainea inexpectata (Marshall, 1979)
Height 11.5mm, Diameter 12mm, Endemic
South Kermadec Ridge, 788-803 metres [K.]
Genus: Leptothyramap >
Leptothyra benthicola (Marshall, 1979)
Height 4.0mm, Diameter 3.85mm, Endemic
Raoul Island, Kermadec Islands, 87-274 metres [K.]
Leptothyra kermadecensis (Marshall, 1979)
Height 2.0mm, Diameter 2.3mm, Endemic
Raoul Island, Kermadec Islands, 9-37 metres [K.]