Tiny snails, found nowhere else

Most of New Zealand’s native land snails measure one to a few millimetres across, and nearly all of them are endemic. This archive brings together what we know about them: classification, shell and anatomy, distribution and conservation status.

Compiled by Frank Climo and Karin Mahlfeld

The ribbed, coiled shell of Cavellia anguicula seen from above, pale buff with brown streaks
Cavellia anguicula, 4.4 mm across. Hayward’s Reserve, Lower Hutt. Photo: Dave Roscoe, Department of Conservation.

A few mm

Most native land snails are one to several millimetres across.

Endemic

Nearly every native species lives in New Zealand and nowhere else.

NZTCS

Each factsheet gives the threat status under the New Zealand Threat Classification System.

Free PDFs

Every factsheet can be downloaded, printed and taken into the field.

What each factsheet covers

Every factsheet follows the same structure, so species can be compared side by side. Each one is revised when new information becomes available.

Classification

Family, current name and authority, so you know exactly which species you are reading about.

Synonyms

Earlier names the species has been published under, which matters when reading older literature.

Shell and anatomy

Size, shape, sculpture and colour pattern, with scanning electron micrographs and drawings of the reproductive anatomy (if available).

Distribution

Based mainly on our research records and museum holdings.

Habitat

Forest litter, logs, ferns, limestone or cave entrances: where to look, and at what altitude.

Conservation status

Threat ranking according to the New Zealand Threat Classification System, updated as new information arrives.

Three views of a Cavellia anguicula shell from Paengaroa: from above, from below showing the wide umbilicus, and from the side
Paengaroa specimen, 5.0 mm across, in three views. Photo: Dave Roscoe, Department of Conservation.

Cavellia anguicula (Reeve, 1852)

A small, finely ribbed snail forest leaf litter dweller, and one of the more common species. Its translucent buff shell, streaked with brown, is wider than it is tall, with a broad open umbilicus. Riblets alternate in height.

FamilyCharopidae
Threat statusNot Threatened (NZTCS)
BiostatusIndigenous, endemic
ShellAbout 4.4 mm across at 5 whorls
RangeNorth Island south of Auckland and Coromandel; northern South Island, scattered south to Dunedin
HabitatForest leaf litter, often with decaying wood, from sea level to at least 1000 m

Inside a factsheet

A shell under 5 mm carries detail that only shows under the microscope. Factsheets pair the description of shell and reproductive anatomy with images, micrographs and drawings.

Six scanning electron micrographs of Cavellia anguicula shells: two whole shells, then close views of the embryonic and adult shell sculpture
Shell sculpture. Scanning electron micrographs of specimens from Kaikoura (NMNZ M.69752) and Opotiki (NMNZ M.4061). Scale lines 1, 0.1 and 0.1 mm.
Pen drawing of the lectotype shell of Helix anguicula from below, above and the side
The type specimen. Lectotype of Helix anguicula Reeve, 1852, Natural History Museum, London. Drawing from Climo (1993), fig. 6. Scale line 1 mm.
Line drawing of the reproductive organs of Cavellia anguicula, with details labelled A to E
Reproductive anatomy. The reproductive system of Cavellia anguicula (A), with details at a larger scale (B to E).

The people behind the archive

FMC

Frank Climo

Researcher

Has described and revised New Zealand land snails since the late 1960s, from the carnivorous Rhytididae to the tiny Charopidaeand Punctidae. The genus Climocella is named in his honour.

KM

Karin Mahlfeld

Researcher

Collaborates with the Department of Conservation on New Zealand’s threatened land snails and led the 2012 assessment of their conservation status.

Published in 2025

Sixteen new species of Sinployea

A revision of the genus, with threat rankings for every species. Most are naturally uncommon or data deficient, and Sinployea australis is now presumed extinct.

Mahlfeld, Climo and Roscoe. Zoological Journal of the Linnean Society 204(1).

Get involved

Ask for access to unpublished work

Some of the archive’s records are not yet published. Researchers can ask for an account to see them, and each account is approved by the archive team.

Found a native snail?

Photograph it beside a ruler or a coin for scale, note where you found it, and post it to iNaturalist NZ, where others can help identify it. Please leave the snail where it was.

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