Nature conservation

Threatened species

Dural Land Snail - profile

Indicative distribution


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Key:
known
predicted
The areas shown in pink and/purple are the sub-regions where the species or community is known or predicted to occur. They may not occur thoughout the sub-region but may be restricted to certain areas. ( click here to see geographic restrictions). The information presented in this map is only indicative and may contain errors and omissions.
Scientific name: Pommerhelix duralensis
Conservation status in NSW: Endangered
Commonwealth status: Endangered
Gazetted date: 09 Apr 2015
Profile last updated: 06 Jul 2019

Description

Pommerhelix duralensis (the Dural Land Snail), also commonly known as the Dural Woodland Snail, is a medium sized snail with a dark brown to black semi-translucent, subglobose (almost spherical shaped) shell. Adults grow approximately 10–23 mm in height and 14–23 mm in width. The Dural Land Snail superficially resembles the related species Meridolum corneovirens (Cumberland Plain Land Snail), with which the Dural land snail is parapatric (the species' ranges are immediately adjacent to each other but do not significantly overlap).
Unless identified otherwise, referenced material and statements in this description are drawn from the Commonwealth Listing Advice and references therein, and that should be used for further information and referencing purposes.

Distribution

The species is a shale-influenced-habitat specialist, which occurs in low densities along the western and northwest fringes of the Cumberland IBRA subregion on shale-sandstone transitional landscapes.

There is currently a degree of uncertainty about the distribution and identity of the snails in this and related species. Pommerhelix duralensis in the strict sense is found in an area of north-western Sydney between Rouse Hill - Cattai and Wiseman's Ferry, west from Berowra Creek. North of the Hawkesbury and Wiseman's Ferry there is an entity with morphologically similar shells but which have not had the DNA sequenced. The Blue Mountains records have been assigned to Pommerhelix 'Elizabeth', a genetically distinct species which has been sampled at Elizabeth Lookout in Glenbrook, and which extends along the eastern escarpment of the Blue Mountains. In the northern side of Sydney, between Parramatta and Port Jackson and east of Berowra Creek is identified as Meridolum middenense.

The species is definitely found within the Local Government Areas of The Hills Shire, Hawkesbury Shire and Hornsby Shire. Records from the Blue Mountains City, Penrith City and Parramatta City may represent this species. Occurrence in Wollondilly Shire is considered unlikely in light of current knowledge.

Habitat and ecology

  • The species has a strong affinity for communities in the interface region between shale-derived and sandstone-derived soils, with forested habitats that have good native cover and woody debris.
  • It favours sheltering under rocks or inside curled-up bark. It does not burrow nor climb. The species has also been observed resting in exposed areas, such as on exposed rock or leaf litter, however it will also shelter beneath leaves, rocks and light woody debris.
  • Migration and dispersal is limited, with overnight straight-line distances of under 1 metre identified in the literature and studies. The species is active from approximately one hour after dusk until dawn and no confirmed diurnal activity is reported. It exhibits no roost-site behaviour.
  • The species is known to aestivate, and secretes an epiphragm to protect against dessication.
  • The main food sources are hyphae and fruiting bodies of native fungi. It is possible other detritus may be consumed.
  • Reproduction rates are very low, with few eggs (about 32) per season. Mortality is 90% in the first year, and 99.8% within four-five years.

Regional distribution and habitat

Click on a region below to view detailed distribution, habitat and vegetation information.


Threats

Recovery strategies

Activities to assist this species

IBRA Bioregion IBRA Subregion Known or predicted Geographic restrictions region
Sydney BasinCumberland Known None
Sydney BasinPittwater Known None
Sydney BasinWollemi Known None
Sydney BasinYengo Known None