Document ID: chunk:federal_register_of_legislation:F2025L00287:reg:3:p124
Version: federal_register_of_legislation:F2025L00287
Segment Type: reg
Provision Reference: reg 3 (pt 124/276)
Character Range: 495919–499189

Helicarionida (Mollusca, Pulmonata). PhD Thesis, University of Sydney.
Hyman IT, Caiza J & Köhler F (2023) Systematic revision of the microcystid land snails endemic to Norfolk Island (Gastropoda: Stylommatophora) based on comparative morpho-anatomy and mitochondrial phylogenetics. Invertebrate Systematics 37(5–6), 334–443.
Smith BJ (1992) Non-marine Mollusca, in WWK Houston (ed) Zoological Catalogue of Australia Volume 8. Australian Government Publishing Service, Canberra.
TSSC (Threatened Species Scientific Committee) (2009b) Commonwealth Listing Advice on Mathewsoconcha grayi ms. Department of the Environment, Water, Heritage and the Arts, Canberra.
Tweed J (2023) Phillip Island Survey March 2023. Unpublished data.
Varman RVJP (1991) Conchological Survey 1983-90: Manuscript of Land Mollusca Fossiliferous and Present Day. Unpublished manuscript.

Advena phillipii—Phillip Island glass-snail

Conservation significance
Endemic to the Norfolk Island Group.
EPBC Act Listing Status: Critically Endangered (listed as Mathewsoconcha phillipii).
Approved Conservation Advice: 19/12/2008 (DEWHA 2008c).

Description
Very similar to Advena grayi but has a slightly larger shell, the spire is shorter and there is a white narrow peripheral band. Typical specimen is 16 mm in diameter and 12 mm in height (Hyman 2005).

Distribution
This species is known from non-fossil material only from two official specimens collected from Phillip Island in 1908 (TSSC 2009c). Fossils of this species were collected from the Cemetery Bay area of Norfolk Island (Varman 1991). It is likely extinct on Norfolk Island and restricted to Phillip Island where, because of the previous destruction of the vegetation by rabbits, it is unlikely to be anything other than very rare.

Ecology
Live-bearing.

Habitat
Saxicoline, under rocks (Smith 1992).

Threats
Major threats include habitat loss, fragmentation and degradation by land clearing and stock grazing, as well as the introduction of feral animals (notably rats) and invasive weeds. Drying conditions and lower soil moisture balances due to climate change remain a threat to endemic snails in the Norfolk Island Group.

Impact on other species
None known.

Risk assessment
Not undertaken as species is presumed extinct.

Management actions
Restore native forest habitat, control introduced weeds and predators (chickens, rodents), survey to determine the presence of any existing populations and if found to be extant, consider captive breeding.

Recovery target
Not applicable as species is presumed extinct.

Relevant literature
DEWHA (Department of the Environment, Water, Heritage and the Arts) (2008c) Approved Conservation Advice for Mathewsoconcha phillipii (Phillip Island Helicarinoid Snail). Department of the Environment, Water, Heritage and the Arts, Canberra.
Hyman I (2005) Taxonomy, systematic, and evolutionary trends in Helicarionida (Mollusca, Pulmonata). PhD Thesis, University of Sydney.
Hyman IT, Caiza J & Köhler F (2023) Systematic revision of the microcystid land snails endemic to Norfolk Island (Gastropoda: Stylommatophora) based on comparative morpho-anatomy and mitochondrial phylogenetics. Invertebrate Systematics 37(5–6), 334–443.
Iredale T (1945) The land mollusca of Norfolk Island. Australian