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Kangaroo Island Micro-trapdoor Spider (Moggridgea rainbowi)

This small trapdoor spider occurs only on Kangaroo Island, South Australia. It lives in shallow burrows in creek banks, so creekline habitat is important to consider when planning works.

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 Moggridgea rainbowi.

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

Identification: Appearance

It is described as brownish-black, with squat legs and a body about the size of a $2 coin. Its shallow burrow has a trapdoor.

It is described as brownish-black, with squat legs and a body about the size of a $2 coin. Its shallow burrow has a trapdoor.

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 endemic to Kangaroo Island and has a predominantly coastal distribution. Scattered populations occur in creeklines from the north-west to the north-east of the island.

The species is endemic to Kangaroo Island and has a predominantly coastal distribution. Scattered populations occur in creeklines from the north-west to the north-east of the island.

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 occupies shallow burrows in the banks of small, low-energy creeklines. Burrows are approximately 6 to 7 cm deep.

It occupies shallow burrows in the banks of small, low-energy creeklines. Burrows are approximately 6 to 7 cm deep.

Foraging habitat: Diet

The spider waits in its silk-lined burrow for prey to wander past. Its specific diet is not described.

The spider waits in its silk-lined burrow for prey to wander past. Its specific diet is not described.

Breeding habitat: Breeding

Females care for their young; one account describes young spiders living with their mother in her burrow. When ready, juveniles disperse short distances to make their own burrows.

Females care for their young; one account describes young spiders living with their mother in her burrow. When ready, juveniles disperse short distances to make their own burrows.

Sheltering habitat: Shelter

It shelters in a silk-lined underground burrow with a close-fitting trapdoor. The burrows are shallow and built into creek banks.

It shelters in a silk-lined underground burrow with a close-fitting trapdoor. The burrows are shallow and built into creek banks.

Threats: Threats

Severe fires can burn the trapdoors and kill spiders in their shallow burrows. Habitat loss, invasive weeds and erosion that carries sediment into creeks are also identified as concerns.

Severe fires can burn the trapdoors and kill spiders in their shallow burrows. Habitat loss, invasive weeds and erosion that carries sediment into creeks are also identified as concerns.

Threats: Works risk

Clearing or ground disturbance around creek banks could damage shallow burrows or remove habitat. Erosion and sediment entering creeks may also bury creekline habitat.

Survey methodology: 1. Species-specific methods

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

Surveys have searched fire-affected habitat for spiders and their burrows, and researchers have mapped the species' distribution. Post-fire surveys reported finding five survivors in the fire ground.

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

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