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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.
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 =
Gastropoda - Vetigastropoda - (Vetigastropoda) - Family: Colloniidae



Genus: Argalista

Argalista crassicostata (Murdoch, 1905)
Width 3.2mm, Height 2.5mm
South Island. Foveaux Strait and Stewart Island, Snares Islands [FAnE.]
Argalista fluctuata (Hutton, 1883)
Height 2.25mm, Width 3.0mm
North, South, Stewart, Chatham and Southern Islands [ACFMAnE.]
Argalista imperforata (Suter, 1908)
Height 3.05mm, Width 3.5mm
North, South and Stewart Island [ACFE.]
Argalista micans (Powell, 1931)
Height 1.13mm, Width 1.43mm
Snares and Auckland Islands [AnE.]
Argalista nana (Finlay, 1930)
Height 0.9mm, Width 2.5mm
Three Kings Islands to Northland [AE.]
Argalista rotella (Powell, 1937)
Height 1.1mm, Width 1.6mm
Off Three Kings Islands [AE.]
Argalista umbilicata (Powell, 1926)
Height 1.9mm, Width 2.75mm
Off South Island and southern islands [CFMAnE.]
Argalista variecostata (Powell, 1937)
Height 1.8mm, Width 2.3mm
Off Three Kings Islands [AE.]

Genus: Cantrainea

Cantrainea inexpectata (Marshall, 1979)
Height 11.5mm, Diameter 12mm
South Kermadec Ridge, 788-803 metres [K.E.]

Genus: Leptothyra

Leptothyra benthicola (Marshall, 1979)
Height 4.0mm, Diameter 3.85mm
Raoul Island, Kermadec Islands, 87-274 metres [K.E.]
Leptothyra kermadecensis (Marshall, 1979)
Height 2.0mm, Diameter 2.3mm
Raoul Island, Kermadec Islands, 9-37 metres [K.E.]