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About the Data

Checklist/Taxonomy. I use WoRMS as a reference for the current accepted taxonomy for species, and am adding direct links to WoRMS taxa pages for each species.

I am using older taxonomy for the larger Land Snails (Powelliphanta/Placostylus etc). Recent DNA has indicated that many of the sub-species are not valid and have been synonomysed in some checklists. I have chosen to keep the "sub-species" separated here, to indicate the various known populations, forms or colonies. The relationship between the various "sub-species", colonies and forms is continually under revision, so will be updated as more is known about these groups.

Sizes. An indication of normal maximum size is listed for most species. This may not necessarily be the largest recorded size (RLNZS), but is used to indicate the average maximum size. The largest recorded size is constantly changing for many species as larger specimens are being found, and many large specimens are never measured, so the maximum size is not always accurate.

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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
E =
Endemic
I =
Introduced
R =
Recent
Sf =
Subfossil
Fo =
Fossil