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Dulacca Woodland Snail (Adclarkia dulacca)

The Dulacca Woodland Snail is a land snail endemic to south-east Queensland, occurring in small, isolated populations. Habitat relevant to works includes remnant and regrowth woodland, particularly Brigalow, where rocks, leaf litter and woody debris provide suitable shelter and microhabitat.

Conservation status

Commonwealth, EPBC Act 1999: Endangered.

Queensland, Nature Conservation Act 1992: Endangered.

Seasonal planning

Recommended surveys are from October to March after heavy rainfall, while project surveys aligned with the snail’s optimal timing were conducted from March to June.

Seasonal evidence: From published sources for this species.

Timing varies between sites and years.

  • Survey timing: Recommended surveys are from October to March after heavy rainfall, while project surveys aligned with the snail’s optimal timing were conducted from March to June.

Identification: Appearance

Not documented in the published sources used for this profile.

Not documented in the published sources used for this profile.

Identification: Confirming identity

Confirm the identity of any suspected record with a specialist and a photograph or voucher, as required by the relevant permit.

Distribution: Known range

The species is known from a restricted area of Queensland around Miles and Dulacca, extending south to Meandarra; records also place populations between Miles and Yuleba and from Wandoan to Meandarra. It occurs in small, isolated and fragmented populations.

The species is known from a restricted area of Queensland around Miles and Dulacca, extending south to Meandarra; records also place populations between Miles and Yuleba and from Wandoan to Meandarra. It occurs in small, isolated and fragmented populations.

Distribution: National mapping

The Commonwealth species distribution model (SNES) maps where the species or its habitat is known, likely or may occur. Use it with local records and site inspection.

Habitat: Habitat

It inhabits vine thicket, Brigalow woodland, ironbark and Lancewood woodland on ridges, and Gum-topped Box woodland. It can also occur in woodland regrowth or cleared paddocks where suitable rocks, logs, woody debris or other microhabitat remain.

It inhabits vine thicket, Brigalow woodland, ironbark and Lancewood woodland on ridges, and Gum-topped Box woodland. It can also occur in woodland regrowth or cleared paddocks where suitable rocks, logs, woody debris or other microhabitat remain.

Foraging habitat: Diet

It likely feeds on fungi, lichen, algae and other detritus or biofilm growing on organic litter.

It likely feeds on fungi, lichen, algae and other detritus or biofilm growing on organic litter.

Breeding habitat: Breeding

Canopy cover from trees or shrubs, together with rocks or woody debris, helps maintain humid microhabitat conditions for breeding and reduces the risk of desiccation.

Canopy cover from trees or shrubs, together with rocks or woody debris, helps maintain humid microhabitat conditions for breeding and reduces the risk of desiccation.

Sheltering habitat: Shelter

The snail shelters under rocks, logs and other woody debris, and may also shelter under loose bark at the base of trees. Leaf litter and humid locations provide additional cover.

The snail shelters under rocks, logs and other woody debris, and may also shelter under loose bark at the base of trees. Leaf litter and humid locations provide additional cover.

Threats: Threats

Threats include habitat clearing and fragmentation, buffel grass invasion, high-intensity fire, predation by rats and mice, and trampling by cattle.

Threats include habitat clearing and fragmentation, buffel grass invasion, high-intensity fire, predation by rats and mice, and trampling by cattle.

Threats: Works risk

Works that clear or fragment woodland habitat can remove suitable habitat and the rocks, logs, leaf litter and woody debris the snail uses. High-intensity fire and trampling can also harm the species.

Survey methodology: 1. Commonwealth guidance

Use methods consistent with the Commonwealth survey guidelines and engage a specialist with the right permits.

For EPBC Act referrals, survey effort and methods should be consistent with the on-ground surveys and data for referred actions under the EPBC Act, read with the Significant impact guidelines 1.1.

Survey methodology: 2. Limits

A non-detection is not proof of absence. Match survey timing to the species and season, and record effort.

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.

It inhabits vine thicket, Brigalow woodland, ironbark and Lancewood woodland on ridges, and Gum-topped Box woodland.

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: QLD.

Habitat use: general

Vegetation associations: Woodland

It inhabits vine thicket, Brigalow woodland, ironbark and Lancewood woodland on ridges, and Gum-topped Box woodland.

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: QLD.

Habitat use: general

Vegetation associations: Acacia, mulga or brigalow

It inhabits vine thicket, Brigalow woodland, ironbark and Lancewood woodland on ridges, and Gum-topped Box woodland.

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: QLD.

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

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

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

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. Desktop and approvals

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

Check national mapping, state records and recent surveys for the site. An action likely to have a significant impact on this nationally listed species needs EPBC Act referral, and state permits apply where it is state listed.

Before disturbance: 2. Plan to avoid

Design the footprint, timing and access to avoid known or likely habitat, and brief crews on what to look for and who to call.

During disturbance: 1. Controls

Keep works inside the approved footprint and conditions.

Fence or mark habitat to be retained and keep machinery, stockpiles and spoil out of it.

During disturbance: 2. Stop and report

If the species is found unexpectedly, stop work at that spot and contact the project ecologist and the relevant agency.

After disturbance: 1. Records

Record outcomes.

Record sightings, habitat lost or retained and any injury or death, and report them under the approval conditions.

Rehabilitation: 1. Restore

Restore disturbed habitat where possible.

Reinstate disturbed ground with local species, return logs, rocks and litter, and control weeds and erosion until the site is stable.

Sources