Aprasia inaurita

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Aprasia inaurita
Aprasia inaurita.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Squamata
Family: Pygopodidae
Genus: Aprasia
Species:
A. inaurita
Binomial name
Aprasia inaurita
Kluge, 1974
Aprasia inaurita distribution.svg

The Mallee worm-lizard (Aprasia inaurita), also known as the pink-nosed worm-lizard and the red-tailed worm-lizard, is a slender pygopid (legless lizard) species that is endemic to Australia, with recorded distribution across the four southern mainland states, although its distribution is restricted in Western Australia and New South Wales. [2]

Contents

Description

The Mallee worm-lizard (Aprasia inaurita) is identifiable by its pale olive brown or greyish-brown colouring from above, a whitish underside, with a reddish-brown hue around the Mallee worm-lizard’s head and neck and a distinctly bright reddish-orange tail. [2] The Mallee worm-lizard also lacks an external ear opening and has very small black eyes, with the lack of an external ear opening being what distinguishes Aprasia inaurita from Aprasia aurita, the eared worm-lizard, which is also confusingly known as the Mallee worm-lizard in the state of Victoria. [2]

The Mallee worm-lizard has a snout-vent length of 135mm, with studies upon body length of the species finding that females were larger than males, with the average female body size around 115.6mm and the average male body length around 101.6mm. [2] [3] The same study also found that males were more common than females but this may have been attributed to the time of the year the study was conducted. [3]

Aprasia inaurita is differentiated from other Aprasia by:

Habitat

The Mallee worm-lizard inhabits semi-arid areas of red sandy soils and woodlands of the Mallee region and surrounds. [2] Thought to be dependent on spinifex ( Triodia scariosa ), the Mallee worm-lizard is often found sheltering in sand, beneath mallee stumps, through leaf litter, or as a fossorial species inhabiting ant tunnels. [2] [5] [6] The Mallee worm-lizard is also said to require mature habitats with a well-developed surface debris layer. [7] To burrow through loose soil and to crawl through narrow earth cracks and insect tunnels, Aprasia species use lateral undulations for locomotion. [5]

Ecology

The Aprasia species are myrmecophagous, with the Mallee worm-lizard specifically targeting the Aphaenogaster sp. eggs and larvae. [8] Webb & Jones (1994) state that the Aprasia species are opportunistic “binge feeders” which feed infrequently, but when they do come across an ant brood for instance, they will feed in excess. [3] Studies on how Aprasia species can locate ant colonies, and specifically ant broods, have not yet been researched and are open for inquest, with chemoreceptors of ant pheromonal trails being a possible explanation which is a similar adaptation of some snake species. [3]

Pygopodids are predated upon by diurnal raptors, elapid snakes, goannas, feral cats and foxes, of which, they represent a minor dietary component for these predators. [5] Aprasia inaurita was observed by Rankin (1976) to raise its tail from the substrate and wave it when prodded, suggesting that the tail may be for defense purposes, and being brightly colored and blunt, it may be used as a decoy for predators. [8] Pygopodids have also been found to be predated upon by the trematode Paradistoma crucifer, the cestode Acanthotaenia striata and by the nematodes Abbreviata sp. [5]

Taxonomy and Distribution

The Mallee worm-lizard belongs to the Pygopodidae family of squamates (scaled reptiles), commonly referred to as ‘legless lizards’ for their snake-like appearance with absent forelimbs and very small vestigial hind-limb flaps which, for the Mallee worm-lizard, occur as small scaley flaps located by the cloacal vent. [2] [9] The Pygopodidae family are recognised as a being closely related to two families of gecko, the Carphodactylidae and Diplodactylidae, and are represented by 47 species, of which, 35 species are placed into two subfamilies, the Lialisinae and the Pygopodinae, with 7 genera: Lialis (two species), Delma (22 species),  Paradelma (monotypic), Pygopus (five species), Ophidiocephalus (monotypic), Aprasia (15 species), Pletholax (two species). [10] [11]

The Aprasia species are noted as one of the most divergent genera from the Pygopodidae family. [3] The Mallee worm-lizard (Aprasia inaurita) is a part of the Aprasia genus which is predominately found in Southern Australia, with the Mallee worm-lizard itself being distributed across a narrow band which stretches from the southeast of Western Australia, across southern South Australia, the northwest corner of Victoria and southwestern New South Wales. [7] The IBRA (Interim Biogeographic Regionalisation for Australia) regions that the Mallee worm-lizard occurs in NSW are the Murray Darling Depression and Riverina regions, with 8% occurrence across New South Wales’ reserves. [2] More specifically, the Mallee worm-lizard has been discovered through the Mallee region between Balranald and Gol Gol with centralised recordings of the Mallee worm-lizard in the Mallee Cliffs National Park area. [2] [5] Recordings of the Mallee worm-lizard have also been found in the central mallee region around Pulletop and Gubbata Nature Reserves and around the Scotia Mallee area. [2]

Due to the severely fragmented distribution of this species, local populations of the Mallee worm-lizard are vulnerable to extinction from stochastic events. [7]

Reproduction

Pygopodids are noted as being oviparous (egg laying) and will have a usual clutch size of two with an incubation period of 66 to 77 days, which is common for the Mallee worm-lizard which will mate in Spring and lay in October. [5]

A study on the sex of Aprasia inaurita determined that adult males of the species contained the presence of 'spurs' on their hindlimb flaps which were found to not be present in the adult females or juveniles of the species. [8] The males of all Aprasia species also had toothed premaxilla, as opposed to juveniles and females with none, or being vestigial in females. [3] This dimorphism has been inferred to either assist males in bouts with other males, to hold down females during copulation, or to assist males in taking down larger prey. [3]

Pygopodids have lived up to 7 years in captivity; however, little else is known of the life history of Pygopodids, in particular, the Mallee worm-lizard. [5]

Threats

A major threat to the Mallee worm-lizard is habitat destruction through clearing, as well as agriculture and land management practices, which thereby remove debris and ground cover that the Mallee worm-lizard depends upon. [2] With mallee vegetation once covering 383,000 km2, 35% of this has since been removed through land clearing. [12] Agricultural practices can also increase soil compaction through machinery and livestock, from which, livestock can feed upon and also trample on important food resources. [2] The Mallee worm-lizard is also under threat by introduced pest species, i.e., the introduced European rabbit (Oryctolagus cuniculus), the red fox ( Vulpes vulpes ) and the house cat ( Felis catus ). [2]

Altered fire regimes may also pose a threat to the Mallee worm-lizard through the reduced availability of spinifex habitat which would thereby increase the chances of predators to find and prey upon the Mallee worm-lizard. [2] Although the immediate effects of fire on the Mallee worm-lizard found no observed effect on this species after a fire event, it is however affected by impacts upon its habitat. [13]

Status

The Mallee worm-lizard is described as being of least concern by the IUCN (International Union for Conservation of Nature) red list, however, in 2004 the Mallee worm-lizard (Aprasia inaurita) is listed as an endangered species within the Australian state of New South Wales. [7] The New South Wales scientific committee confirming that if the circumstances and factors that threaten the survival of the Mallee worm-lizard do not cease than the Mallee worm-lizard is likely to become extinct in nature within New South Wales. [7]

Due to this status within New South Wales, the Mallee worm-lizard has been assigned to the landscape management stream according to the New South Wales Saving our Species (SoS) program which focuses on the threats of habitat destruction and the impacts of landscape clearing, with the aim of securing the Mallee worm-lizards in the wild in New South Wales and extending, or maintaining, its New South Wales’ geographical range. [14]

Related Research Articles

<span class="mw-page-title-main">Pygopodidae</span> Family of lizards

Pygopodidae, commonly known as snake-lizards, or flap-footed lizards, are a family of legless lizards with reduced or absent limbs, and are a type of gecko. At least 35 species are placed in two subfamilies and eight genera. They have unusually long, slender bodies, giving them a strong resemblance to snakes. Like snakes and most geckos, they have no eyelids, but unlike snakes, they have external ear holes and flat, unforked tongues. They are native to Australia and New Guinea.

<i>Aprasia</i> Genus of lizards

Aprasia is a genus of lizards in the family Pygopodidae. The genus is endemic to Australia. The species in the genus Aprasia are worm-like, burrowing lizards. At least four of the species are oviparous.

<span class="mw-page-title-main">Legless lizard</span> Common name for a lizard without obvious legs

Legless lizard may refer to any of several groups of lizards that have independently lost limbs or reduced them to the point of being of no use in locomotion. It is the common name for the family Pygopodidae. These lizards are often distinguishable from snakes on the basis of one or more of the following characteristics: possessing eyelids, possessing external ear openings, lack of broad belly scales, notched rather than forked tongue, having two more-or-less-equal lungs, and/or having a very long tail.

<i>Aprasia aurita</i> Species of lizard

Aprasia aurita, also called the mallee worm-lizard or eared worm-lizard, is a species of lizard in the Pygopodidae family endemic to Australia; and listed on Schedule 1 under the Commonwealth's Endangered Species Protection Act. It is also listed as "threatened" on Schedule 2 under the Victorian Flora and Fauna Guarantee Act. A. aurita was formerly found in the Woomelang and Ouyen areas of north-western Victoria. Due to human land use, it is now mostly found in 400 ha of Wathe State Wildlife Reserve, north-western Victoria. It has also been found in Cobbler Creek Recreation Park in South Australia and Mambray Creek Reserve. It inhabits tall shrubland and open heath, primarily mallee and other vegetation that has not been burnt for at least 40 years, Shelters under rotting logs, leaf litter and mallee root.

<span class="mw-page-title-main">Flinders Ranges worm-lizard</span> Species of lizard

The Flinders Ranges worm-lizard is a species of lizard in the Pygopodidae family endemic to the state of South Australia. The name derives from the Flinders Ranges.

<span class="mw-page-title-main">Collared delma</span> Species of lizard

The collared delma or adorned delma is the smallest species of lizard in the Pygopodidae family endemic to Australia. Pygopopdids are legless lizards, so are commonly mistaken for snakes. They are distributed mainly across south-east Queensland and northern New South Wales, in both forests and some suburban areas. They are active during the day, seen foraging and hunting for small insects.

<span class="mw-page-title-main">Brigalow scaly-foot</span> Species of lizard

Paradelma orientalis, commonly known as the Brigalow scaly-foot or Queensland snake-lizard, is a species of legless lizard in the family Pygopodidae. It is endemic to Australia and is the only species in the monotypic genus Paradelma.

<span class="mw-page-title-main">Burton's legless lizard</span> Species of lizard

Burton's legless lizard is a species of lizard in the family Pygopodidae. The species lacks forelegs and has only rudimentary hind legs. Pygopodid lizards are also referred to as "legless lizards", "flap-footed lizards" and "snake-lizards". This species is native to Australia and Papua New Guinea.

<span class="mw-page-title-main">Pink-tailed worm-lizard</span> Species of lizard

The pink-tailed worm-lizard or granite worm-lizard is a rare legless lizard found in Australia. The animal looks like a combination of small snake and worm. Its total length is up to 14 cm. It has a pink tail and is white underneath. The head and neck are brown, and the rest of the top of the body is pale grey. Scales on the back each have a dark bar, giving the appearance of dots down the back. It is found on two hills near Tarcutta, Bathurst, New South Wales, Bendigo in Victoria, and along the sides of the Molonglo River and Murrumbidgee River and on Mount Taylor in the Australian Capital Territory. The lizards eat invertebrates that live under rocks. They can be found under rocks sized from 0.15 to 0.6 m. Their main diet is ant eggs, particularly from Iridomyrmex species and Rhytidoponera metallica.

<span class="mw-page-title-main">Mallee military dragon</span> Species of lizard

The Mallee military dragon, also commonly known as the Mallee dragon and the Mallee sand-dragon, is a species of lizard in the family Agamidae. The species is native to the arid parts of southern Australia.

The eastern hooded scaly-foot or eastern scaly-foot is a species of flap-footed lizard found in the complex heaths of the lower west coast and the spinifex grasslands of mainland Australia. They are popular pets and are often mistaken for snakes due to their limbless appearance.

<span class="mw-page-title-main">Marble-faced delma</span> Species of legless lizard endemic to Australia

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

<i>Delma butleri</i> Species of lizard

Delma butleri, also known commonly as Butler's legless lizard, Butler's scalyfoot, the spinifex snake-lizard, and the unbanded delma, is a species of lizard in the family Pygopodidae. The species is endemic to Australia.

<span class="mw-page-title-main">Excitable delma</span> Species of lizard

The excitable delma is a species of lizard in the Pygopodidae family endemic to Australia. The lizard gets its name from its active and jumpy defense mechanism. It will erratically jump multiple times in succession, each jump pivoting its body in a different direction. D. tincta is a slender, long legless lizard that through evolution lost its limbs. It is found throughout Australia in a variety of habitats, and spends most of its time hiding. Due to its nocturnal nature, it is rare to spot in the wild. This legless lizard is small to moderate in size, with a tail that is three to four times its body length. The typical size of the excitable delma is 250 – 300 mm. This lizard is an insectivore and feeds on insects it finds when travelling through grass, logs, surface soil, and loose rocks. Like all pygopodids, the excitable delma is oviparous and only lays two eggs per clutch.

<span class="mw-page-title-main">Shark Bay worm-lizard</span> Species of lizard

The Shark Bay worm-lizard, also known commonly as Harold's legless skink, is a species of lizard in the family Pygopodidae. The species is endemic to the Shark Bay region in Western Australia, Australia. It is a limbless lizard found burrowing in loose soil in arid areas.

<span class="mw-page-title-main">Zuytdorp worm-lizard</span> Species of lizard

The Zuytdorp worm-lizard, also known commonly as Smith's legless lizard, is a species of lizard in the family Pygopodidae. The species is endemic to Australia.

The striated worm-lizard is a species of legless lizard in the family Pygopodidae. It is endemic to southern Australia. Commonly known as Striated worm-lizard but has also been referred to as the Striped or Lined worm-lizard due to its pattern of long, thin parallel streaks. Some populations such as those in WA and Kangaroo Island may have absent stripes or the lines present as lines of dots.

The yellow-tailed plain slider is a species of skink located primarily in the desert areas of South Australia, Western Australia, Northern Territory and New South Wales in Australia. This uncommon lizard can be identified by its bright yellow tail, and is usually found buried under loose soil, tree stumps and leaf litter.

<i>Ctenophorus spinodomus</i> Species of lizard

Ctenophorus spinodomus commonly known as Eastern Mallee Dragon, is a species of agamid lizard endemic to the arid and semi-arid regions of southeastern Australia. Belonging to the genus Ctenophorus, which comprises a diverse group of 35 species this small lizard is characterised by striking colours and unique behaviours. Commonly known as dragon lizards, spinodomus is derived from the Greek words "spinos" (thorn) and "domos" (house), referring to its preference for burrowing habitats among spiny vegetation. They are curious creatures and can be found darting between the safety of Triodia grass clumps or basking on the red sand.

<span class="mw-page-title-main">Olive legless lizard</span> Australian lizard species

The olive legless lizard is a species of legless gecko from the Pygopodidae family. This species is commonly found throughout the Australian Capital Territory, New South Wales, Queensland and southeastern South Australia, mostly inhabiting areas consisting of dry to temperate southern grasslands and grassy woodlands.

References

  1. Cogger, H.; Shea, G. (2017). "Aprasia inaurita". IUCN Red List of Threatened Species . 2017: e.T102827758A102827860. doi: 10.2305/IUCN.UK.2017-3.RLTS.T102827758A102827860.en . Retrieved 18 November 2021.
  2. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Office of Environment and Heritage (OEH). 2017. Mallee Worm-lizard profile. https://www.environment.nsw.gov.au/threatenedspeciesapp/profile.aspx?id=10060
  3. 1 2 3 4 5 6 7 Webb, J. K. Shine, R. 1994. Feeding habits and reproductive biology of Australian Pygopodid lizards of the genus Aprasia. American Society of Ichthyologists and Herpetologists (ASIH), 1994(2), 390-398.
  4. 1 2 3 4 5 Kluge, A. G. 1974. A taxonomic revision of the lizard family Pygopodidae. University of Michigan Museum of Zoology. Report No. 147.
  5. 1 2 3 4 5 6 7 Shea, G. M. 1983. Family Pygopodidae; In Glasby, C. G. Ross, G. J. B. Beesley, P. L. (Eds.). Fauna of Australia – Volume 2a Amphibia and Reptilia. AGPS Canberra.
  6. Cogger, H. G. (2014). Reptiles and amphibians of Australia. CSIRO Publishing.
  7. 1 2 3 4 5 Adam, P. 2004. Mallee worm-lizard (Aprasia inaurita) – endangered species listing. NSW Department of Plannning and Environment. https://www.environment.nsw.gov.au/topics/animals-and-plants/threatened-species/nsw-threatened-species-scientific-committee/determinations/final-determinations/2004-2007/mallee-worm-lizard-aprasia-inaurita-endangered-species-listing
  8. 1 2 3 Jones, S. R. 1999. Conservation biology of the Pink-tailed legless lizard – Aprasia parapulchella. University of Canberra Applied Ecology Research Group.
  9. Cogger, H. G. (2000). Reptiles and amphibians of Australia. Reed Books: Chatswood.
  10. Gamble, T. Greenbaum, E. Jackman, T. R. Russell, A. P. Bauer, A. M. 2012. Repeated origin and loss of adhesive toepads in geckos. PLOS ONE. 7 (6): e39429. Bibcode:2012PLoSO...739429G. doi : 10.1371/journal.pone.0039429 PMC 3384654. PMID 22761794.
  11. Jennings, B. W. 2021. Evolutionary relationships among the snakelike pygopodid lizards: a review of phylogenetic studies of an enigmatic Australian adaptive radiation. PeerJ. doi : 10.7717/peerj.11502
  12. Driscoll, D. Henderson, M. 2008. Managing remnant mallee vegetation for biodiversity using fire and fox control. Australia and Pacific Science Foundation. http://www.apscience.org.au/apsf_05_3/
  13. Driscoll, D. Henderson, M. 2008. How many common reptile species are fire specialists? A replicated natural experiment highlights the predictive weakness of a fire succession model. Biological Conservation, 141(2), 460-471.
  14. Office of Environment and Heritage (OEH). n.d. Mallee Worm-lizard (Aprasia inaurita) – Saving our Species strategy. Department of Planning Industry and Environment. https://www.environment.nsw.gov.au/savingourspeciesapp/project.aspx?ProfileID=10060