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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