Marble-faced delma

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Marble-faced delma
Marble-faced Delma (Delma australis) (9388485579).jpg
Scientific classification Red Pencil Icon.png
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Squamata
Family: Pygopodidae
Genus: Delma
Species:
D. australis
Binomial name
Delma australis
Kluge, 1974
Delma australis distribution.svg

The Delma australis is often known as the southern legless lizard, or the marble-faced delma. [2] This terrestrial lizard falls into the category of slender Pygopodidae, a legless lizard. [2] There are 21 known species in the Pygopdidae family in Australia. [3] Marble-faced delmas are endemic to Australia.[ citation needed ]Delma australis was first described by Kluge in 1974. [3]

Contents

Description

Marble-faced delma Marble-faced Delma (Delma australis) (9391248832).jpg
Marble-faced delma

D. australis is a brown to reddish brown colour with a greyish undersurface and greyish lips. [2] Their common name, marble-faced delma, comes from their grey-marble appearance. Distinctive features include ventral black bars on the top and sides of head with a short and rounded snout, and a tail twice the length of their body. [2] Geographical variation have been observed in marble-faced delma populations, the intensity of head patterning and head form can vary between populations in different areas. [3] There has been suggestions that there are a number of sub-species of D. australis, variation was discovered in Western Australia but further sampling is needed to determine if these differences were taxonomically significant. [3]

Ecology

Marble-faced delmas are classified as diurnal, however, have been observed in active states at night or around dawn and dusk. [2] They are often found in leaf litter, under rocks or in spinifex. [2] Classified as terrestrial, but can successfully climb hummock grass and branches of small shrubs. [2]

Distribution

Marble-faced delmas are widely distributed across southern Australia. [3] They are found to inhabit semi-arid to arid areas in southern Western Australia, most of South Australia, southern Northern Territory, north-west Victoria, and south-west New South Wales. [2] They are terrestrial, or land dwelling, species that are commonly found in spinifex grass. [2]

Distribution in New South Wales

Marble-faced delma populations are known to be in the Broken Hill Complex Interim Biogeographic Regionalisation of Australia Region, in some of the sub-regions of the Cobar Peneplain Interim Biogeographic Regionalisation of Australia Region, and in sub-regions of the Murray Darling Depression Interim Biogeographic Regionalisation of Australia Region. [4] [5] [6] In these areas the species in known to be within different vegetation formation and classes, including the Stony Desert Mulga Shrublands which is an Acacia sub-formation, Dune Mallee Woodlands which is a shrubby sub-formation, and Sand Plain Mallee Woodlands. [4] [5] [6] These areas are arid to semi-arid warm zones. [4]

Reproduction

Marble-faced delmas reproduce sexually and are oviparous (egg layers), with a clutch size of 2. [7] The eggs hatch after approximately 70 days. [2] They are precocial, meaning they are hatched in an advanced state where they are able to feed themselves and independently move.[ citation needed ]

Diet

Considered insectivores, they actively hunt for their food which primarily consists of insects and spiders. [8]

Conservation

Spinifex grass variation a common habitat for Marble-faced delma Diplodactylus conspicillatus Habitat.jpg
Spinifex grass variation a common habitat for Marble-faced delma

The conservation status of marble-faced delmas in New South Wales is endangered, their conservation status is not listed in the Commonwealth. [2] Degradation of their habitat and losses in their population can be attributed to land use for agricultural purposes. [9] Over-grazing by livestock and feral species within their habitat affects the density and structure of spinifex. [9] Weed invasion and degradation of soil structure within the Mallee-spinifex habitat has also led to habitat loss for the Marble-faced delma populations. [9]

Threats

Threats of the marble-faced delma include: habitat clearance; an increase in fire frequencies reducing the amount of ground cover; predation; loss of leaf litter; heavy grazing and habitat trampling by stock, feral goats, rabbits and pigs. [2]

Predation

Predation is not a major threat, although it is likely foxes are a predator of the marble-faced delma. [2]

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References

  1. Cowan, M.; Ellis, R.; How, R. (2017). "Delma australis". IUCN Red List of Threatened Species . 2017: e.T102830336A102830353. doi: 10.2305/IUCN.UK.2017-3.RLTS.T102830336A102830353.en . Retrieved 18 November 2021.
  2. 1 2 3 4 5 6 7 8 9 10 11 12 13 "Marble-faced Delma - profile | NSW Environment, Energy and Science". www.environment.nsw.gov.au. Retrieved 2022-07-23.
  3. 1 2 3 4 5 Maryan, Brad; Brennan, Ian G.; Adams, Mark; Aplin, Ken P. (2015-04-10). "Molecular and morphological assessment of Delma australis Kluge (Squamata: Pygopodidae), with a description of a new species from the biodiversity 'hotspot' of southwestern Western Australia". Zootaxa. 3946 (3): 301–330. doi:10.11646/zootaxa.3946.3.1. PMID   25947694.
  4. 1 2 3 "Marble-faced Delma - Broken Hill Complex: Distribution and vegetation associations | NSW Environment, Energy and Science". www.environment.nsw.gov.au. Retrieved 2022-07-23.
  5. 1 2 "Marble-faced Delma - Cobar Peneplain: Distribution and vegetation associations | NSW Environment, Energy and Science". www.environment.nsw.gov.au. Retrieved 2022-07-23.
  6. 1 2 "Marble-faced Delma - Murray Darling Depression: Distribution and vegetation associations | NSW Environment, Energy and Science". www.environment.nsw.gov.au. Retrieved 2022-07-23.
  7. "Marble-faced Delma | Grasslands". grasslands.ecolinc.vic.edu.au. Retrieved 2022-07-23.
  8. Verdon, Simon J.; Watson, Simon J.; Nimmo, Dale G.; Clarke, Michael F. (2020-05-22). "Are all fauna associated with the same structural features of the foundation species Triodia scariosa?". Austral Ecology. 45 (6): 773–787. doi:10.1111/aec.12894. S2CID   219513298.
  9. 1 2 3 NSW Scientific Committee. "Marble-faced delma (Delma australis) - endangered species listing". NSW Environment and Heritage. Retrieved 2022-07-23.