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Ningbing Ranges Camaenid Land Snail (Cristilabrum simplex) (Cristilabrum simplex)

Ningbing Ranges Camaenid Land Snail (Cristilabrum simplex) is a small terrestrial land snail in the family Camaenidae, listed for the Kimberley region of Western Australia. It is known from the Ningbing Range area, with a known total range of 1.02 square kilometres and a linear range of 2.7 km in the interim recovery plan. It is Critically Endangered under the Biodiversity Conservation Act 2016 (WA), Fauna Order 2025(2) in operation from 1 August 2026, and not listed under the EPBC Act.

Conservation status

Western Australia, Biodiversity Conservation Act 2016: Critically endangered.

Seasonal planning

No species-specific activity or breeding months are recorded. Use the following as a works-planning prompt, not as a statement of seasonal biology.

Seasonal knowledge: Unknown for this species.

The month values are a general planning prompt only and do not represent known activity or breeding months for Cristilabrum simplex.

  • Plan checks before disturbance: General planning window only. Check the work area before disturbance whenever works are scheduled; no species-specific seasonal window is known.

Identification: Appearance

Ningbing Ranges Camaenid Land Snail (Cristilabrum simplex) is a small terrestrial land snail in the family Camaenidae. Reliable identification needs a specialist.

A species-specific field description is not summarised here. Use the original description and museum specimens for identification.

Identification: Similar species

Related species in the same genus or group can look alike and may occur nearby. Confirm identity with a taxonomist before relying on a record.

Distribution: Known records

Listed for the Kimberley region. Known from the Ningbing Range area, with a known total range of 1.02 square kilometres and a linear range of 2.7 km in the interim recovery plan.

The Atlas of Living Australia holds 26 records at 3 distinct 0.1-degree locations, between latitude -15.3 and -15.2, longitude 128.6 to 128.7. Coordinates are often generalised for listed species, so treat this as an indicative area, not a boundary.

Distribution: Group pattern

The interim recovery plan records that these threatened camaenids are exclusive to limestone in the East Kimberley, and that each is a short-range endemic with a known range of less than 5.6 square kilometres. Twenty-five occur in the Ningbing Range area north of Kununurra.

Distribution: WA listing

DBCA lists the species for the Kimberley region.

Habitat: Habitat

Litter piles, rubble heaps and deep crevices of limestone outcrops, sometimes under limestone boulders or pavements. The plan notes that shade, periods of 100% humidity and a supply of leaf litter from nearby vine thicket, kapok and boab trees are needed.

Litter piles, rubble heaps and deep crevices of limestone outcrops, sometimes under limestone boulders or pavements. The plan notes that shade, periods of 100% humidity and a supply of leaf litter from nearby vine thicket, kapok and boab trees are needed.

Species-specific habitat preferences have not been published in detail; this is based on the group and the listed locality.

Habitat: Site interpretation

Treat matching habitat in or near the listed locality as potentially occupied until a qualified survey shows otherwise.

Foraging habitat: Diet

The interim recovery plan records these snails feeding on decaying leaf and grass fragments, and possibly algae and fungi.

The interim recovery plan records these snails feeding on decaying leaf and grass fragments, and possibly algae and fungi.

Breeding habitat: Breeding

Breeding has not been described for this species. The plan notes the snails are active and exposed for about 80 days each year.

Breeding has not been described for this species. The plan notes the snails are active and exposed for about 80 days each year.

Sheltering habitat: Shelter

Shaded limestone crevices, rock rubble and leaf litter. The plan notes a colony may occupy no more than a small pocket of rocks.

Shaded limestone crevices, rock rubble and leaf litter. The plan notes a colony may occupy no more than a small pocket of rocks.

Threats: Threats

The plan names cattle grazing and trampling and inappropriate fire regimes as the most common threats, with weeds, cane toads, caving and exploration as potential threats.

The plan names cattle grazing and trampling and inappropriate fire regimes as the most common threats, with weeds, cane toads, caving and exploration as potential threats.

Threats: Works risk

Any removal, crushing or blasting of limestone rubble, track grading at outcrops, fire, or stock access to the outcrop could directly remove the habitat or the snails.

Survey methodology: 1. Desktop review and design

Follow the EPA Western Australia technical guidance and engage specialists with the right licences.

Use the EPA Western Australia guidance on short range endemic invertebrates: desktop review of museum and survey records, targeted habitat searches, and collection or photography under the right licence.

Survey methodology: 2. Field survey

Search the habitat named in this profile by hand (litter, logs, rocks, burrows or host plants), and repeat after rain or in the cooler months when many short range invertebrates are active.

Survey methodology: 3. Identification and limits

Identification often needs a specialist taxonomist and voucher specimens. A non-detection is not proof of absence.

Vegetation associations: Rainforest or vine thicket

Source-checked associations and automatically indexed candidates are separated below. An association does not establish site presence, preference or dependence.

The plan notes that shade, periods of 100% humidity and a supply of leaf litter from nearby vine thicket, kapok and boab trees are needed.

Automatically indexed from existing profile text. Not a verified preference, mapped occurrence or habitat requirement. Check the original source and regional qualifiers before use.

Evidence: Unreviewed profile-derived candidate

Confidence: Not independently verified

Region: Scope as described in the quoted profile text; not independently verified. Profile states: WA.

Habitat use: general

Ecosystem associations

Source-checked associations and automatically indexed candidates are separated below. An association does not establish site presence, preference or dependence.

No species-specific ecosystem association has been indexed or source-checked in this evidence library. This is an evidence gap, not evidence of no association.

Soil and substrate associations: Rocky, stony or shallow ground

Source-checked associations and automatically indexed candidates are separated below. An association does not establish site presence, preference or dependence.

Litter piles, rubble heaps and deep crevices of limestone outcrops, sometimes under limestone boulders or pavements.

Automatically indexed from existing profile text. Not a verified preference, mapped occurrence or habitat requirement. Check the original source and regional qualifiers before use.

Evidence: Unreviewed profile-derived candidate

Confidence: Not independently verified

Region: Scope as described in the quoted profile text; not independently verified. Profile states: WA.

Habitat use: general

Soil and substrate associations: Calcareous or limestone ground

The interim recovery plan records that these threatened camaenids are exclusive to limestone in the East Kimberley, and that each is a short-range endemic with a known range of less than 5.6 square kilometres.

Automatically indexed from existing profile text. Not a verified preference, mapped occurrence or habitat requirement. Check the original source and regional qualifiers before use.

Evidence: Unreviewed profile-derived candidate

Confidence: Not independently verified

Region: Scope as described in the quoted profile text; not independently verified. Profile states: WA.

Habitat use: general

Water and wetland associations

Source-checked associations and automatically indexed candidates are separated below. An association does not establish site presence, preference or dependence.

No species-specific water association has been indexed or source-checked in this evidence library. This is an evidence gap, not evidence of no association.

Fauna records and mapped habitat: Not yet analysed

Record locations can be overlaid with mapping, but record frequency alone does not measure habitat preference. No species is excluded from desktop assessments by this analysis.

No quality-controlled record-to-map analysis has been completed for this species. The existing generalised distribution dots and indicative range polygons have not been treated as precise occurrence coordinates.

A defensible run needs dated, independently attributable records, coordinate uncertainty, duplicate and captive-record checks, layer versions and regional scope. Preference and absence require additional survey-effort and detection evidence.

Habitat limitations and contrary evidence: No supported exclusion recorded

Not recorded is not the same as cannot occur. Low suitability, resident habitat, breeding habitat and occasional movement are different conclusions.

This library has not established a vegetation, ecosystem or soil-type exclusion for this species. This does not mean all habitat is suitable; the evidence needed to justify an exclusion has not been assembled.

Habitat limitations and contrary evidence: Before using a negative association

  • Confirm the taxon, geographic region, life stage and habitat function covered by the evidence.
  • Check survey methods, season, repeated effort and detectability before interpreting non-detection.
  • Investigate credible contradictory records and microhabitats absent from broad mapping.
  • Do not convert a missing map class, low record count or failed data request into species absence.

Before disturbance: 1. Pre-start review

Confirm whether the project could affect the species before any works begin.

Check the project footprint against the listed locality, DBCA records and any survey results. Map habitat that matches this profile.

Before disturbance: 2. Approvals

Taking or disturbing listed threatened fauna in WA needs authorisation under the Biodiversity Conservation Act 2016. Seek DBCA advice early.

Before disturbance: 3. Crew briefing

Brief crews on the habitat to avoid, the exclusion areas and who to call if the species or its habitat is found.

During disturbance: 1. Protect habitat

Keep works inside the approved footprint.

Any removal, crushing or blasting of limestone rubble, track grading at outcrops, fire, or stock access to the outcrop could directly remove the habitat or the snails. Fence or flag known habitat and keep vehicles, stockpiles and spoil out of it.

During disturbance: 2. Stop and report

If the species or suspected habitat is found outside the approved area, stop work at that spot and contact the project ecologist and DBCA.

After disturbance: 1. Record outcomes

Record what was done.

Record any sightings, specimens, habitat lost or retained and any incidents, and submit records to DBCA as required by the authorisation.

Rehabilitation: 1. Restore

Restore disturbed areas where possible.

Return surface materials, logs, rocks and litter, restore drainage and revegetate with local species. Use hygiene controls for dieback in the south-west.

Sources