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Mallee Worm-Lizard Version Has Been Prepared for Web Publication #20 This Action Statement was first published in 1992 and remains current. This Mallee Worm-lizard version has been prepared for web publication. It Aprasia aurita retains the original text of the action statement, although contact information, the distribution map and the illustration may have been updated. © The State of Victoria, Department of Sustainability and Environment, 2003 Published by the Department of Sustainability and Environment, Victoria. Mallee worm-lizard (Aprasia aurita) Distribution in Victoria (DSE 2002) 8 Nicholson Street, (Illustration by John Las Gourgues) East Melbourne, Aprasia by having an external ear opening, Victoria 3002 Australia Description and Distribution The Mallee Worm-Lizard (Aprasia aurita) although this is small and partially covered This publication may be of belongs to the reptile family Pygopodidae, by a notched scale. assistance to you but the the legless lizards or snake-lizards. There is almost no biological information State of Victoria and its Pygopodids are long, slender and snake- available on this species, and little on the employees do not guarantee like, with no eyelids, a fleshy tongue, genus as a whole. Wilson & Knowles (1988) that the publication is smooth to keeled, overlapping scales, describe some species of Aprasia as without flaw of any kind or generally a visible ear opening, a fragile crepuscular or nocturnal, and subterranean, is wholly appropriate for favouring moist substrates under rocks and your particular purposes tail, no forelimbs, and vestigial hindlimbs debris, around embedded rotting stumps and therefore disclaims all reduced to a scaly flap. The genus Aprasia liability for any error, loss differs from other pygopodids because it and in ant nests. Their diet is believed to or other consequence which has a short blunt tail, a tiny hindlimb flap, include small arthropods, including the eggs, may arise from you relying and no visible external ear opening. Four larvae and pupae of ants. The diet of the on any information in this species of Aprasia occur in Victoria. sympatric (co-occurring) Pink-nosed Worm publication. The Mallee Worm-Lizard is a small, very Lizard Aprasia inaurita includes the eggs slender species, with a snout-vent length of and pupae of small ants, Aphaenogaster spp. ISSN 1448-9902 about 110 mm, and a total length of about (Coventry, pers. comm.). The slender, 180 mm. It is brown on the upper surface elongate body of Aprasia is believed to fading to grey on the sides. The under facilitate access into galleries of ant nests. surface is off-white. The centre of each The Mallee Worm-Lizard is believed to be dorsal and lateral scale has a dark mark, diurnal, but is a burrowing species that the marks forming a series of faint to rarely comes to the surface. The species is prominent longitudinal lines. There is a found in mallee heaths and hummock dark streak extending from the eye to the grasslands on a sandy substrate, and has tip of the snout. The Mallee Worm-Lizard is been recorded in sand beneath mallee roots distinguishable from all other species of and decomposing leaf litter. It has not yet been found in ant nests or Triodia hummocks, In its final recommendations, the Scientific Advisory although it is likely to be associated with small ants, and Committee (1991) determined that the Mallee Worm-Lizard is: perhaps uses their tunnels. • in a demonstrable state of decline which is likely to The Mallee Worm-Lizard is apparently confined to a small result in extinction; area in northwestern Victoria, between Woomelang and • very rare in terms of abundance and distribution. Ouyen, centring on the Wathe State Wildlife Reserve (SWR). The Wathe SWR, which is approximately 6000 ha, is Major Conservation Objective near the town of Lascelles on the Sunraysia Highway in The major conservation objective for the Mallee Worm-Lizard northwestern Victoria. is to initiate management action to ensure maintenance of a viable population of at least 200 individuals. Conservation Status Current Status Management Issues DCE (1990) Endangered Ecological Issues Specific to the Taxon The Mallee Worm-Lizard has been listed as a threatened Further research on the Mallee Worm-Lizard is an urgent taxon on Schedule 2 of the Flora and Fauna Guarantee Act priority. Because so little is known of the biology of this 1988. species, it is important that studies of its habitat requirements, diet and population dynamics are undertaken so that Reasons for Conservation Status management aimed at its conservation can begin. There are a The Mallee Worm-Lizard was described from a small series number of general issues which may have an impact on the of specimens collected early this century in the Ouyen and conservation of this species, but at the moment these are Woomelang area of northwestern Victoria. Most of the land largely speculative. in these areas has now been cleared for agriculture, leaving There is a simultaneous need to clarify the distribution and only a few small remnants of habitat. abundance of this species in northwestern Victoria. This will be Until biological surveys of the Mallee began in 1985, no undertaken by Flora & Fauna Division and Mildura Region specimens of the Mallee Worm-Lizard had been collected within the review period of this Action Statement. since the original collections were made, and it was feared Clearing mallee vegetation, especially at and around the sites that the species might have become extinct. During 1985, a of the original collections (Ouyen and Woomelang), has small population was discovered in the Wathe SWR. probably reduced the range and abundance of this species. Despite a widespread general survey of other suitable areas Fire, particularly changed fire regimes, may also have an throughout the mallee, the occurrence in Wathe constitutes impact on the Mallee Worm-Lizard. the entire known world population of this species. The species is known from only four localities in an area of Wider Conservation Issues about 4OO ha in the reserve, and may be declining Wathe SWR was originally created to conserve the Malleefowl (Robertson et al. 1989). Only 15 individuals have been (Leipoa ocellata), which is present in reasonable numbers in the observed since 1985. reserve. Another significant species in Wathe is the Striated Until recently, the vegetation of the Wathe reserve had not Grasswren (Amytornis striatus). Both species are listed as been burnt for at least 40 years and is, therefore, considered vulnerable by the Victorian Government (DCE 1990). The extremely vulnerable to wildfire. A wildfire during late implementation of this Action Statement would benefit the 1991 burnt approximately 800 ha of the reserve, adjacent to, management of these species as well as of the Mallee Worm- but not including, the area where the Mallee Worm-Lizard Lizard, and also of Wathe SWR and adjacent areas of the Big occurs. The fire history of the vegetation may be a key Desert. factor in explaining why the Mallee Worm-Lizard has such a restricted distribution, despite extensive areas of similar Social and Economic Issues mallee occurring in the adjacent, but much more frequently There is likely to be little social or economic impact given the burnt, Big Desert. Dietary specification may also play an apparent restriction of this species to the Wathe SWR, an area important role in determining its distribution. of Crown Land already managed by DCE for its nature The Mallee Worm-Lizard must be considered to be in a conservation values. precarious position, due to its apparently specialised Pressures to clear remnant blocks of mallee vegetation on habitat, extremely restricted distribution, probably low and adjoining freehold land are not great and should be perhaps declining numbers, and the almost total lack of discouraged with assistance provided through the Land knowledge of the biology and ecology of the species. Protection Incentive Scheme and Tree Victoria. As a last resort, There has been an apparent decline in distribution, and clearing remaining native vegetation should be opposed therefore presumably in numbers, with the species no through the Native Vegetation Clearance Controls should longer being found at the sites of the original collections. landholders not be persuaded voluntarily to protect remnant Being confined to the one locality and in apparently low vegetation. The economic and agricultural value of such land is numbers would suggest that the species is vulnerable to low. catastrophes such as fire and disease. 2 Management Action Victoria. Additional morphological information collected as an adjunct to the main project could provide an insight into the relationships of the Victorian Aprasia species. Previous Management Action Freehold land in the vicinity of Wathe should be targeted for There have been no previous management actions apart programs such as Land for Wildlife and Tree Victoria, from field surveys by DCE staff carried out during the especially where grants are available to assist landholders in Mallee surveys for the Land Conservation Council. protecting and developing habitat. Intended Management Action Legislative Powers Operating Research Legislation • Accurately determine distribution within Wathe Wildlife Act 1975 ¾ covers State Nature Reserves, and controls SWR and nearby areas of mallee vegetation. research, management and possession of protected wildlife. • Estimate the size of the Wathe population and Flora and Fauna Guarantee Act 1988 ¾ provides legal powers determine its demography. for the protection of
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