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Smooth Crayfish (Euastacus girurmulayn)

Euastacus girurmulayn is a small freshwater crayfish endemic to northeastern New South Wales. It is associated with cool, shaded highland streams and permanently wet gullies, habitats to consider when works may affect headwater catchments.

Conservation status

Commonwealth, EPBC Act 1999: Endangered.

Seasonal planning

No species-specific activity or breeding months were found in the published sources used. Use the following as a works-planning prompt, not as seasonal biology.

Seasonal knowledge: Not documented in the sources used.

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

  • Plan checks before disturbance: General planning window only. Check the work area before disturbance whenever works are scheduled.

Identification: Appearance

This is a small, smooth-shelled, poorly spinose crayfish, typically brown when viewed from above. Its maximum occipital carapace length is about 34 mm.

This is a small, smooth-shelled, poorly spinose crayfish, typically brown when viewed from above. Its maximum occipital carapace length is about 34 mm.

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 has a restricted range in the Nightcap Range of northeastern New South Wales. Records include Tuntable Creek and tributaries or gullies associated with Terania, Gibbergunyah, Rocky and Cooper’s creeks.

The species has a restricted range in the Nightcap Range of northeastern New South Wales. Records include Tuntable Creek and tributaries or gullies associated with Terania, Gibbergunyah, Rocky and Cooper’s creeks.

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 is associated with cool, well-shaded highland streams and wet gullies, including permanently wet areas with stream lilies and Piccabeen or Bangalow palms. Reported elevations range from about 110 to 720 m above sea level.

It is associated with cool, well-shaded highland streams and wet gullies, including permanently wet areas with stream lilies and Piccabeen or Bangalow palms. Reported elevations range from about 110 to 720 m above sea level.

Foraging habitat: Diet

Not documented in the published sources used for this profile.

Not documented in the published sources used for this profile.

Breeding habitat: Breeding

Not documented in the published sources used for this profile.

Not documented in the published sources used for this profile.

Sheltering habitat: Shelter

Not documented in the published sources used for this profile.

Not documented in the published sources used for this profile.

Threats: Threats

Drought, land clearing, water extraction, illegal fishing and inadequate habitat protection are identified as threats. Bushfire and rising water temperatures are also identified as concerns for its habitat.

Drought, land clearing, water extraction, illegal fishing and inadequate habitat protection are identified as threats. Bushfire and rising water temperatures are also identified as concerns for its habitat.

Threats: Works risk

Land clearing and water extraction are identified risks, while drought, bushfire and rising water temperatures can affect its habitat. Works that remove shade or alter water conditions in cool, permanently wet headwater streams could therefore degrade habitat used by the species.

Survey methodology: 1. Species-specific methods

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

The species has been found during routine crayfish surveys. Genetic analyses have been undertaken on samples from potentially new distribution areas.

Survey methodology: 2. Commonwealth guidance

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: 3. Limits

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

Vegetation associations

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

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

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.

Records include Tuntable Creek and tributaries or gullies associated with Terania, Gibbergunyah, Rocky and Cooper’s creeks.

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: NSW.

Habitat use: general

Water and wetland associations: Water-associated habitat mentioned in profile

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

It is associated with cool, well-shaded highland streams and wet gullies, including permanently wet areas with stream lilies and Piccabeen or Bangalow palms.

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: NSW.

Habitat use: general

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