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Arid Bronze Azure Butterfly (Ogyris petrina)

Arid Bronze Azure Butterfly (Ogyris petrina) is a bronze azure butterfly (Lycaenidae) whose larvae live inside the nests of one sugar ant, listed for the Goldfields and Wheatbelt regions of Western Australia. It is known from Barbalin Nature Reserve near Mukinbudin and a second site about 100 km away. It is Critically Endangered under the Biodiversity Conservation Act 2016 (WA), Fauna Order 2025(2) in operation from 1 August 2026, and Critically Endangered under the EPBC Act.

Conservation status

Western Australia, Biodiversity Conservation Act 2016: Critically endangered.

Commonwealth, EPBC Act 1999: Critically endangered.

Seasonal planning

The highlighted months are a general guide from the group biology.

Seasonal evidence: General, not site-specific.

Check local advice; timing varies between years.

  • Main activity or breeding period: Plan surveys and avoid disturbance in these months where possible.

Identification: Appearance

Arid Bronze Azure Butterfly is a bronze azure butterfly (Lycaenidae) whose larvae live inside the nests of one sugar ant. 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 Goldfields and Wheatbelt regions. Known from Barbalin Nature Reserve near Mukinbudin and a second site about 100 km away.

The Atlas of Living Australia holds 132 records at 7 distinct 0.1-degree locations, between latitude -30.9 and -30.8, longitude 118.1 to 121.5. Coordinates are often generalised for listed species, so treat this as an indicative area, not a boundary.

Distribution: Group pattern

DBCA records only two extant subpopulations, at Barbalin Nature Reserve near Mukinbudin and a second site about 100 km away. The butterfly depends on large colonies of a sugar ant, Camponotus sp. nr. terebrans.

Distribution: WA listing

DBCA lists the species for the Goldfields and Wheatbelt regions.

Habitat: Habitat

DBCA describes the known sites as mature mixed gimlet and salmon gum woodland on red-brown loam with an open understorey. Host ant colonies are at the base of mature smooth-barked eucalypts.

DBCA describes the known sites as mature mixed gimlet and salmon gum woodland on red-brown loam with an open understorey. Host ant colonies are at the base of mature smooth-barked eucalypts.

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

Larvae develop entirely inside the host ant nest. Adults need a mix of flowering plants for nectar.

Larvae develop entirely inside the host ant nest. Adults need a mix of flowering plants for nectar.

Breeding habitat: Breeding

Larvae live inside host ant nests. DBCA gives the main adult flight period as mid-September to late October.

Larvae live inside host ant nests. DBCA gives the main adult flight period as mid-September to late October.

Sheltering habitat: Shelter

Host ant nests at the base of smooth-barked eucalypts.

Host ant nests at the base of smooth-barked eucalypts.

Threats: Threats

DBCA lists the species for its low abundance and severely fragmented distribution. Loss of large host ant colonies removes the butterfly.

DBCA lists the species for its low abundance and severely fragmented distribution. Loss of large host ant colonies removes the butterfly.

Threats: Works risk

Clearing of mature smooth-barked eucalypts and soil disturbance at their base, where the host ant nests. DBCA recommends a host ant survey before any butterfly survey.

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: Woodland

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

DBCA describes the known sites as mature mixed gimlet and salmon gum woodland on red-brown loam with an open understorey.

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: Loamy soils

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

DBCA describes the known sites as mature mixed gimlet and salmon gum woodland on red-brown loam with an open understorey.

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. Actions likely to have a significant impact also need EPBC Act referral.

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.

Clearing of mature smooth-barked eucalypts and soil disturbance at their base, where the host ant nests. DBCA recommends a host ant survey before any butterfly survey. 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