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Armoured Mist Frog (Mosleyia lorica)

The Armoured Mist Frog is a small, nocturnal torrent frog restricted to fast-flowing rainforest creeks in the Wet Tropics of north-eastern Queensland. It is Critically Endangered and has undergone a severe decline associated with chytrid fungus, so occupied streams, riparian vegetation and moist rainforest refuges require careful protection during clearing and construction.

Conservation status

Commonwealth, EPBC Act 1999: Critically endangered.

Breeding season

Calling has been recorded in January, February, November and December, but the breeding season, egg laying, tadpole development and metamorphosis periods are not documented. Treat suitable stream habitat as potentially occupied throughout the year, and plan clearing or dewatering with particular care around flowing rocky streams.

Reproductive mode: Oviparous, with development through a larval stage.

Clutch size: 50 to 163 eggs.

Incubation: Not recorded.

Size at hatching or birth: 2.3 mm.

Age at maturity: Not recorded.

Nest or egg sites: Likely fast-flowing rocky streams, but not confirmed.

Breeding frequency: One reported clutch per year.

Confirm timing locally before works, using recent calling observations and local rainfall and temperature patterns, because these triggers may alter breeding activity.

  • Calling: Possible calling is recorded in January, February, November and December. No peak is identified, and calling may occur outside these months because the breeding season is unknown.
  • Egg laying: Egg laying months are not recorded. Eggs are likely to be laid in fast-flowing rocky streams, so treat suitable stream habitat as potentially affected throughout the year.
  • Tadpoles: Tadpole months are not recorded. Tadpoles are aquatic, can reach 5 cm, and attach to rocks in flowing water, so in-stream works may affect this stage in any month.
  • Froglets: The timing of metamorphosis and juvenile emergence is not recorded. Use an all-year precautionary window because the species has a larval stage and no seasonal development data are available.
  • Active period: The species is nocturnal, but its activity season is not recorded. Plan nocturnal fauna searches and disturbance controls in every month.
  • Highest clearing risk: No lower-risk months are supported by the available evidence. Eggs, tadpoles, metamorphs and nocturnal adults may be present throughout the year, particularly in or beside fast-flowing rocky streams.

Identification

This is a small grey to grey-brown tree frog associated with highland rainforest streams. It is difficult to identify reliably in the field because it belongs to a group of closely related torrent frogs and its call is not known.

Adults grow to about 35 to 37 mm snout to vent length. The back is grey or grey-brown and the underside is white. The dorsal skin is tubercular, with prominent tubercles on the eyelids and around the tympanum.

The fingers are half webbed and the toes are fully webbed. Both have well-developed discs. The tympanum is small and indistinct, and a vocal sac is absent.

Maximum reported size: 35 mm in one dataset, and up to 37 mm in another supplied source.

Dorsal colour: Grey to grey-brown.

Ventral colour: White.

Skin: Tubercular on the back, especially around the eyelids and tympanum.

Identification: Sex differences

Males have black, spiny nuptial pads on the thumbs and accessory spines on the chest. These structures help males maintain grip during amplexus.

No reliable male and female body size averages are supplied.

Male features: Black spiny thumb pads and accessory chest spines.

Female features: No separate field characters are reported in the supplied documents.

Weight: Not reported.

Identification: Field detection and similar species

The species is nocturnal and is associated with fast-flowing creeks and streams in rainforest. Night searches should concentrate on wet stream margins, rocks, low vegetation and other surfaces beside flowing water, but the supplied documents do not give a standard detection distance or search effort.

The call is unknown. It is expected to be similar to the call of the Waterfall Frog, but this is not confirmed. The Armoured Mist Frog occurs in the Australian torrent frog complex with the Waterfall Frog, Mountain Mist Frog and Common Mist Frog, so photographs and expert confirmation are recommended for any suspected record.

No species-specific tracks, scats, nests, burrows, sloughs or eyeshine are reported. Tadpoles are undescribed, although they are expected to have a large oral disc and streamlined body like Waterfall Frog tadpoles, an inference linked to life in fast-flowing water.

  • Treat any small, web-footed frog found beside a Wet Tropics upland stream as requiring confirmation before clearance proceeds.
  • Photograph the dorsal surface, underside, head, eyelids, tympanum, fingers and toes, and record the exact creek, elevation and location.
  • Do not rely on calls alone, because a confirmed Armoured Mist Frog call is not available in the supplied documents.

Distribution: State and bioregion

The documented range is confined to north-eastern Queensland in the Wet Tropics. The historical extent was about 120 km², with records from four localities between 640 and 1,000 m elevation.

The species is known only from Queensland. Its documented range is in the Wet Tropics of north-eastern Queensland, including rainforest streams in and around the Daintree and Cape Tribulation areas.

The supplied documents do not provide a separate IBRA bioregion name, but the localities are within the Wet Tropics region.

Australian state: Queensland only.

Regional setting: Wet Tropics, north-eastern Queensland.

Historical range extent: 120 km².

Elevation: 640 to 1,000 m.

Distribution: Known localities and population status

Known localities are Alexandra Creek, Hilda Creek in Cape Tribulation National Park, Roaring Meg Cascades and Mossman Bluff Creek in Daintree National Park.

The species was not recorded from 1991 until its rediscovery in 2008, when a small population was confirmed. The supplied conservation account states that all populations except one appear to have succumbed to chytrid fungus.

A population size, density, number of mature individuals and current subpopulation count are not provided. One supplied dataset reports the population trend as stable, but this conflicts with the reported severe decline and should not be used alone to assess a project site.

Known localities: Four named localities.

Documented absence period: 1991 to 2008.

Rediscovery: A small population was confirmed in 2008.

Population size: Not reported.

Population trend: Severe decline is reported in the conservation account; one dataset separately reports stable.

Habitat: Stream and rainforest habitat

The Armoured Mist Frog is tied to highland rainforest streams and fast-flowing creeks. Its known elevation range and stream association should guide habitat assessment on project sites.

The species is associated with fast-flowing creeks and streams in northern Queensland rainforests. Records are from 640 to 1,000 m elevation.

Relevant habitat includes the flowing channel, wet banks, splash zones and adjacent rainforest or moist streamside vegetation. The supplied documents do not identify particular tree species or a minimum riparian width.

Primary habitat: Fast-flowing creeks and streams in rainforest.

Elevation range: 640 to 1,000 m.

Known vegetation type: Northern Queensland rainforest.

  • Map all perennial and strongly flowing creek sections within the proposed disturbance area.
  • Retain streamside rainforest, wet banks, rocks and shaded moist surfaces wherever practicable.
  • Assess upstream and downstream sections because the species is associated with connected flowing water rather than isolated artificial ponds.

Habitat: Habitat structure and site assessment

The webbed feet, stream association and inferred streamlined tadpole form indicate dependence on wet, flowing habitats. The supplied documents do not provide measured requirements for canopy cover, substrate size, water temperature, flow rate or riparian width.

For construction planning, record flow condition, channel form, bank moisture, shading, leaf litter, rocks, splash areas and links to intact rainforest. These features are practical indicators of the habitat described for the species, not published thresholds.

  • Inspect both the creek channel and adjacent moist terrestrial and arboreal habitat during nocturnal surveys.
  • Record any diversion, culvert, dewatering, sediment discharge or change in stream shading that could alter the occupied creek.

Foraging habitat: Known information

The supplied documents do not report the Armoured Mist Frog's diet, prey species, feeding method or foraging range. Field assessment should therefore focus on retaining the moist streamside and rainforest surfaces used by this nocturnal frog.

The species is nocturnal and uses aquatic, arboreal and terrestrial settings. No sourced information is provided on arthropods, vertebrate prey, plant matter, feeding height, feeding stations or home range.

Avoid describing a particular prey base or foraging distance in project documents unless supported by site-specific survey or additional species literature.

Diet: Not reported in the supplied documents.

Foraging time: Nocturnal activity is reported.

Foraging range: Not reported.

Foraging settings: Aquatic, arboreal and terrestrial settings are reported.

Foraging habitat: Practical habitat protection

Retain moist rainforest vegetation, wet banks, rocks and low vegetation around occupied streams. Avoid night lighting directed at stream margins where works could affect nocturnal frog activity.

Keep construction sediment, pollutants and concrete washout out of flowing streams. These controls are general practice for a species dependent on fast-flowing rainforest creeks, because the supplied documents do not provide species-specific water-quality thresholds.

  • Use contained washout areas away from drainage lines.
  • Prevent sediment or turbid water entering occupied or potentially occupied creeks.
  • Limit unnecessary night lighting and vehicle movement beside stream margins.

Breeding habitat: Breeding biology

The Armoured Mist Frog lays eggs and has a larval stage, but the supplied documents do not give a breeding season or describe the egg-laying site. Fast-flowing rainforest streams are the best-supported habitat feature for breeding assessment.

The species is oviparous and develops through a larval stage. A reported clutch contains 50 to 163 eggs, and one clutch per year is recorded in the supplied trait data.

The breeding season, egg attachment site, incubation period, larval duration, age at maturity and lifespan are not reported. Tadpoles are undescribed, although a large oral disc and streamlined body are expected by comparison with the Waterfall Frog.

Breeding mode: Egg laying, with a larval stage.

Breeding season: Not reported.

Clutch size: 50 to 163 eggs.

Average clutch: 106.5 eggs, calculated as the midpoint of the reported range.

Clutches per year: One reported clutch per year.

Incubation period: Not reported.

Age at maturity: Not reported.

Lifespan: Not reported.

Hatchling length: 2.3 mm in the supplied dataset.

Breeding habitat: Breeding habitat features

Breeding habitat should be assessed in fast-flowing rainforest creeks and streams within the known elevation range. The likely stream-adapted tadpole form supports protection of flowing water, wet channel margins and suitable submerged or splash-zone surfaces, but the documents do not identify a confirmed oviposition microhabitat.

Do not assume that a site is unoccupied because eggs or tadpoles are not seen. The larval stages are undescribed and adult activity is nocturnal.

  • Survey flowing creek sections and wet margins at night before clearing or in-stream works.
  • Protect the channel, banks, splash zones and connected rainforest during the period of works.
  • Obtain expert advice before disturbing suspected breeding habitat because the breeding season and egg-laying location are not known.

Sheltering habitat: Likely refuge settings

Specific shelters, refuge dimensions and resting sites have not been documented in the supplied material. The species uses aquatic, arboreal and terrestrial settings in wet rainforest stream habitat.

The species is reported from fast-flowing rainforest creeks and is described as aquatic, arboreal and terrestrial. This supports checking wet creek margins, rocks, low vegetation, streamside plants and moist rainforest surfaces during nocturnal searches.

No confirmed refuge type, hollow, burrow, nest, roost, shelter size or daytime retreat is reported.

Refuge type: Not specifically documented.

Reported habitat modes: Aquatic, arboreal and terrestrial.

Shelter dimensions: Not reported.

  • Inspect wet banks, rocks, leaf litter, low vegetation and streamside foliage without turning or removing cover unnecessarily.
  • Retain moist ground cover and shaded vegetation beside flowing water.
  • Treat any frog found away from the channel but within connected rainforest as potentially relevant habitat.

Sheltering habitat: Handling and site protection

The frog is small and nocturnal. Spotters should use clean, moistened hands or fresh non-powdered gloves and minimise handling time, especially because chytrid infection is a documented conservation issue for this species.

Decontaminate footwear, nets, bags and other equipment between catchments and between frog handling locations under the project's amphibian hygiene procedure.

  • Use separate clean bags for individual frogs unless an approved hygiene protocol permits otherwise.
  • Do not move frogs, water, sediment or wet equipment between streams.
  • Record the exact refuge type and microhabitat for every capture.

Threats: Disease

Chytrid fungus is the best-supported major threat in the supplied documents. Habitat disturbance, altered flows and sediment are practical project risks because the species is restricted to fast-flowing rainforest creeks, although species-specific impact thresholds are not provided.

The species underwent a rapid decline in the early 1990s, and chytrid fungus is identified as a likely factor. The supplied conservation account states that all populations except one appear to have succumbed to chytrid.

The rediscovered population was infected but appeared to have acquired some degree of resistance. This does not remove the risk of spreading infection between sites.

Documented disease threat: Chytrid fungus.

Infection status of rediscovered population: Infected, with some apparent resistance reported.

  • Apply strict amphibian hygiene between catchments and between streams.
  • Do not transfer water, mud, wet equipment or captured frogs between sites.
  • Report sick, dead or unusual frogs through the project's fauna and disease reporting process.

Threats: Clearing, construction and hydrology

Clearing of rainforest or streamside vegetation can remove the wet aquatic, arboreal and terrestrial settings used by the species. Fragmentation is a reasonable project concern because the known range is small and confined to named stream localities, but a measured fragmentation threshold is not supplied.

Changes to flow, dewatering, culverting, bank stability, shading or sediment loads may affect habitat associated with fast-flowing creeks. These are habitat-based risk pathways rather than quantified species-specific effects.

  • Avoid clearing occupied or potentially occupied rainforest stream margins.
  • Maintain natural flow paths and avoid dewatering or diverting flowing creeks during works.
  • Prevent sediment, fuel, concrete washout and other pollutants from entering streams.
  • Use fauna spotter catchers and stop-work procedures for suspected Armoured Mist Frogs.

Threats: Fire, roads and predators

The supplied documents do not report a species-specific response to fire, road mortality or introduced predators. Fire is a general concern for rainforest stream habitat because severe fire can damage rainforest, expose soil and increase ash and sediment movement, but the supplied fire account concerns other rainforest frogs.

Roads and predators should be assessed at the project level, especially where roads cross or run beside known streams, but no species-specific mortality rate or predator list is provided.

  • Keep fire, fuel storage and hot works away from rainforest stream buffers where practicable.
  • Design stream crossings to maintain flow and avoid concentrating sediment into the channel.
  • Record any road-killed frog or predator observation and seek specialist confirmation before attributing it to this species.

Survey methodology: 1. Nocturnal stream searches

The Armoured Mist Frog, Mosleyia lorica, is a nocturnal torrent frog associated with fast-flowing creeks and streams in northern Queensland rainforests. The supplied documents do not provide a species-specific survey guideline or prescribed survey effort, so project surveys should be designed by a qualified herpetologist and targeted at suitable stream habitat.

Survey retained and potentially affected rainforest streams, creek margins and wet adjoining vegetation after dark, when the species is active.

Search the stream channel, banks, wet rocks and low vegetation using low-disturbance lighting, and record the search route with GPS.

Give priority to fast-flowing watercourses between 640 and 1,000 metres elevation where the species has been recorded.

Activity: Nocturnal

Known habitat: Fast-flowing creeks and streams in northern Queensland rainforests

Recorded elevation: 640 to 1,000 metres

Historical extent: 120 km²

  • Undertake searches during suitable wet conditions when stream margins are accessible and frog activity is likely.
  • Do not rely on call playback or call surveys because the species call is reported as unknown.
  • Record the date, start and finish times, weather, recent rainfall, stream condition, searchers, route length and all frogs detected.

Survey methodology: 2. Diurnal habitat inspection

Inspect the proposed disturbance area in daylight to map all flowing and intermittent streams, seepage areas, wet rainforest vegetation, banks, boulders and access routes.

Use the daytime inspection to plan the nocturnal search and identify places where machinery, sediment or altered drainage could affect stream habitat.

  • Walk both sides of each affected watercourse where safe, and inspect upstream and downstream of the work area.
  • Map barriers, culverts, crossings, sediment sources and any connection between the affected stream and retained rainforest.
  • Keep the inspection non-destructive and avoid disturbing stream substrates or bank vegetation.

Survey methodology: 3. Survey design and detection records

The supplied documents do not state a required number of survey nights, search hours, transect length, trapping effort or survey area for this species.

Set effort, timing and repeat visits in the project survey plan using current Queensland threatened-frog guidance and advice from the relevant wildlife authority.

  • Document the basis for the selected effort, including habitat extent, elevation, stream flow, access, weather and the potential consequence of a missed detection.
  • Photograph and record any suspected Armoured Mist Frog without relying on an unverified identification.
  • Treat a failure to detect the species as inconclusive where conditions, access or survey coverage were poor.

Survey methodology: Minimum effort and reporting

  • Obtain written advice from the relevant Queensland wildlife authority or a suitably qualified herpetologist before finalising survey effort because no species-specific effort is provided in the supplied documents.
  • Submit verified records, including negative survey results and GPS locations, to the relevant Queensland wildlife database and any project biodiversity database required by the approval.
  • Report the species under both Mosleyia lorica and its former name, Litoria lorica, where database searches or permits use the older name.
  • Retain field sheets, photographs, tracks, weather data, search effort and habitat maps with the project records.

Before habitat disturbance: Avoid and minimise

Treat any suitable northern Queensland rainforest stream habitat as a potential Armoured Mist Frog work constraint. The species has a small known range, a historical extent of 120 km² and a history of severe decline.

Known localities: Alexandra Creek, Hilda Creek, Roaring Meg Cascades and Mossman Bluff Creek

Known altitude range: 640 to 1,000 metres

  • Avoid clearing or occupying fast-flowing rainforest streams and their banks wherever practicable.
  • Retain continuous rainforest vegetation along streams and maintain connections between upstream and downstream retained habitat.
  • Keep crossings, access tracks, spoil areas, stockpiles and drainage outlets out of stream channels and wet adjoining habitat.
  • Design works to prevent sediment, ash, chemicals, concrete washout and altered flow from entering suitable streams.

Before habitat disturbance: Approvals and work planning

  • Confirm whether the proposed action requires referral or approval under the EPBC Act because the project brief identifies the species as nationally listed as Critically Endangered.
  • Confirm Queensland permits, licences and threatened fauna conditions before survey, clearing, capture or relocation work begins.
  • Prepare a fauna management plan that identifies habitat, survey effort, qualified personnel, stop-work triggers, handling procedures, release sites, incident reporting and rehabilitation.
  • Stage clearing so retained stream habitat and escape routes remain available until the relevant work area has been checked and released.

Before habitat disturbance: Site preparation

Adult size: Up to 37 mm, or 35 mm in the separate species account

  • Complete the approved pre-clearance survey immediately before works in suitable stream and rainforest habitat.
  • Clearly mark no-go areas, stream buffers, access limits, sediment controls and any habitat features identified by the ecologist.
  • Install exclusion fencing where it can keep machinery and people out without blocking frog movement between retained stream habitat and adjoining rainforest.
  • Brief all operators and spotter catchers on the species' appearance, nocturnal activity, habitat and the stop-work process.

During habitat disturbance: Daily controls and machinery coordination

Use a qualified fauna spotter catcher and keep machinery outside mapped stream habitat and exclusion areas. The species is small, nocturnal and associated with flowing rainforest watercourses, so daily controls must focus on preventing direct capture, crushing, contamination and flow disturbance.

  • Inspect exclusion fencing, stream crossings, sediment controls and machinery exclusion zones before work starts each day.
  • Require the spotter catcher to inspect the active work area, access route and nearby stream habitat before machinery enters.
  • Keep machinery movement slow and controlled near retained rainforest, creek banks and wet ground, and stop immediately when the spotter catcher gives the stop signal.
  • Do not allow refuelling, servicing, washdown, concrete handling or chemical storage beside suitable stream habitat.
  • Suspend work if heavy rain, runoff, sediment release or a damaged control could affect a flowing stream.

During habitat disturbance: Fauna handling and habitat features

  • The spotter catcher must be appropriately authorised under Queensland requirements before capturing, handling or relocating any frog.
  • Do not handle a frog unless it is necessary to prevent harm, complete an authorised relocation or provide approved veterinary care.
  • Use clean, powder-free gloves and clean, suitable containers if handling is authorised, and minimise handling time and contact with dry or contaminated surfaces.
  • Do not move stream rocks, cobbles, logs, bank vegetation or other habitat features unless the approved method specifically requires it and an ecologist has checked the area.
  • Treat any frog found in machinery, spoil, a drainage feature or a work area as a stop-work matter until the spotter catcher has assessed it.

During habitat disturbance: If a frog is found

  • Stop work in the immediate area and keep personnel and machinery away from the animal.
  • Have the authorised spotter catcher confirm the identification, photograph the frog where practical and record the exact location, habitat, time and activity underway.
  • If relocation is authorised and necessary, move the frog only to nearby retained habitat that has suitable flowing water and has been approved by the ecologist and wildlife authority.
  • Do not release the frog into an unrelated catchment or outside the approved release area.
  • Send an injured frog to an approved wildlife carer or veterinarian as soon as practicable, following the permit and fauna management plan.
  • Record all encounters, captures, relocations, injuries, deaths and control failures, and notify the project environmental officer and relevant authority where required.

After habitat disturbance: Post-clearance checks

Do not treat completion of clearing as the end of the fauna controls. Check the retained stream habitat, confirm that controls remain effective and document any change to flow, water quality or rainforest cover.

  • Complete a post-clearance inspection of the work area, access routes, stream banks, crossings and retained rainforest before demobilisation.
  • Check for stranded, injured or trapped frogs in machinery, trenches, pits, drains, sediment controls and isolated wet areas.
  • Remove temporary fauna traps or barriers only after the spotter catcher or ecologist confirms that no animal remains within the work area.
  • Repair damaged exclusion fencing, crossings and erosion or sediment controls before the next work stage.

After habitat disturbance: Monitoring and reporting

  • Monitor retained and rehabilitated stream habitat using the approved project method, with repeat nocturnal searches where required by the fauna management plan or approval.
  • Record changes in stream flow, sediment, bank condition, rainforest cover, weeds, barriers and any Armoured Mist Frog observations.
  • Provide the approval authority with required survey, incident, relocation, mortality, rehabilitation and monitoring reports.
  • Submit verified records to the relevant Queensland wildlife database and update the project risk assessment if the species is detected.

After habitat disturbance: Controls and offsets

  • Maintain stream protection, sediment control, access restrictions and weed controls for the period specified in the approval and fauna management plan.
  • Review whether residual impacts remain after avoidance, mitigation and rehabilitation measures are applied.
  • Implement any approved offset or conservation measure for unavoidable impacts to habitat, and record its location, area, management actions and reporting requirements.

Rehabilitation actions: Stream and rainforest restoration

Rehabilitation should recreate connected, clean, shaded rainforest stream habitat rather than only revegetating the cleared footprint. The species is associated with fast-flowing creeks and streams, and its known sites are in northern Queensland rainforest.

Habitat association: Fast-flowing creeks and streams in rainforests in northern Queensland

  • Reinstate natural drainage and stream flow without creating new barriers, stagnant pools or concentrated erosion at crossings and outlets.
  • Replant cleared stream margins with locally appropriate native rainforest species from suitable local provenance, using a design approved by the restoration ecologist.
  • Reconnect retained rainforest on both sides of the watercourse where works have fragmented the habitat.
  • Stabilise banks with natural vegetation and suitable locally sourced materials, while avoiding excessive alteration of the channel or streambed.
  • Remove temporary hardstand, spoil and redundant access infrastructure from the rehabilitation area.

Rehabilitation actions: Habitat condition and threat control

  • Prevent sediment, pollutants and altered runoff from entering the rehabilitated stream during and after construction.
  • Control weeds using methods that do not contaminate water or remove recovering native streamside vegetation unnecessarily.
  • Limit artificial night lighting directed at streams and rainforest margins.
  • Manage fire so that rainforest stream refuges are not unnecessarily exposed to severe fire, and follow the approved regional fire management plan.

Rehabilitation actions: Monitoring and success measures

  • Monitor survival and cover of planted native rainforest vegetation, bank stability, stream flow, water clarity, sediment deposition and connectivity with retained habitat.
  • Use the approved frog survey method to check for Armoured Mist Frogs in suitable rehabilitated stream habitat during appropriate nocturnal conditions.
  • Set success measures in the rehabilitation plan before works begin, including vegetation establishment, stable stream banks, effective sediment control, maintained flow and no new barriers to movement.
  • Continue remedial works where monitoring identifies erosion, weed invasion, failed plantings, altered flow or ongoing sediment entry.

Sources