The rusty desert monitor (''Varanus eremius'') is a

species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...

of small

monitor lizard Monitor lizards are lizards in the genus ''Varanus,'' the only extant genus in the family Varanidae. They are native to Africa, Asia, and Oceania, and one species is also found in the Americas as an invasive species. About 80 species are recogn ...

s native to

Australia Australia, officially the Commonwealth of Australia, is a Sovereign state, sovereign country comprising the mainland of the Australia (continent), Australian continent, the island of Tasmania, and numerous List of islands of Australia, sma ...

. It is also known as the pygmy desert monitor. The monitor lizard belongs to the

subgenus In biology, a subgenus (plural: subgenera) is a taxonomic rank directly below genus. In the International Code of Zoological Nomenclature, a subgeneric name can be used independently or included in a species name, in parentheses, placed between t ...

''Odatria'' along with the

pygmy mulga monitor The pygmy mulga monitor (''Varanus gilleni''), also known as Gillen's monitor or just mulga monitor is a species of lizard in the family Varanidae. Taxonomy A description of the species was presented to the Royal Society of Victoria in 1895 by ...

. This monitor lizard is

oviparous Oviparous animals are animals that lay their eggs, with little or no other embryonic development within the mother. This is the reproductive method of most fish, amphibians, most reptiles, and all pterosaurs, dinosaurs (including birds), and ...

as with other monitor lizards.

Taxonomy

A description of the species was presented to the

Royal Society of Victoria The Royal Society of Victoria (RSV) is the oldest scientific society in the state of Victoria in Australia. Foundation In 1854 two organisations formed with similar aims and membership, these being ''The Philosophical Society of Victoria'' (fou ...

in 1895 by Arthur H. S. Lucas and Charles Frost.

Distribution

''Varanus eremius'' is the most widespread of the pygmy goannas. It lives in

desert A desert is a barren area of landscape where little precipitation occurs and, consequently, living conditions are hostile for plant and animal life. The lack of vegetation exposes the unprotected surface of the ground to denudation. About on ...

and semidesert areas of

South Australia South Australia (commonly abbreviated as SA) is a state in the southern central part of Australia. It covers some of the most arid parts of the country. With a total land area of , it is the fourth-largest of Australia's states and territories ...

Western Australia Western Australia (commonly abbreviated as WA) is a state of Australia occupying the western percent of the land area of Australia excluding external territories. It is bounded by the Indian Ocean to the north and west, the Southern Ocean to th ...

, and the

Northern Territory The Northern Territory (commonly abbreviated as NT; formally the Northern Territory of Australia) is an states and territories of Australia, Australian territory in the central and central northern regions of Australia. The Northern Territory ...

. Its

range Range may refer to: Geography * Range (geographic), a chain of hills or mountains; a somewhat linear, complex mountainous or hilly area (cordillera, sierra) ** Mountain range, a group of mountains bordered by lowlands * Range, a term used to i ...

possibly includes

Queensland ) , nickname = Sunshine State , image_map = Queensland in Australia.svg , map_caption = Location of Queensland in Australia , subdivision_type = Country , subdivision_name = Australia , established_title = Before federation , established_ ...

, as well.; Storr & Harold 1980).

Description

The rusty desert monitor reaches a total length of about 50 cm. The colouration of this monitor lizard on the upper side is light to dark reddish-brown with numerous, irregularly distributed, black or deep-brown spots. Sometimes, smaller primrose or cream-colored spots are present. Its tail shows alternating cream-colored and deep-brown longitudinal stripes, which are often broken up into scattered spots at the tail base. A conspicuous black stripe occurs from the

snout A snout is the protruding portion of an animal's face, consisting of its nose, mouth, and jaw. In many animals, the structure is called a muzzle, rostrum, or proboscis. The wet furless surface around the nostrils of the nose of many mammals is c ...

to the eye.

Behaviour

This species spends its life

on the ground "On the Ground" is the debut solo single by Korean-New Zealand singer and Blackpink member Rosé. It was released on 12 March 2021 by YG Entertainment as the lead single from her debut single album, '' R''. It was written by Rosé alongside Amy ...

and seldom climbs

tree In botany, a tree is a perennial plant with an elongated stem, or trunk, usually supporting branches and leaves. In some usages, the definition of a tree may be narrower, including only woody plants with secondary growth, plants that are ...

s. No successful breeding in

captivity Captivity, or being held captive, is a state wherein humans or other animals are confined to a particular space and prevented from leaving or moving freely. An example in humans is imprisonment. Prisoners of war are usually held in captivity by a ...

has yet been reported.

Diet

Stomach contents indicate the diet by volume of the rusty desert monitor consists mainly of other lizards (76%), especially ''

Ctenotus ''Ctenotus'' is a genus of skinks (family Scincidae). The genus belongs to a clade in the ''Sphenomorphus'' group which contains such genera as '' Anomalopus'' and the close relatives '' Eulamprus'' and '' Gnypetoscincus''. Lizards in the genus ...

''. The remainder of animals eaten by this monitor include large

grasshopper Grasshoppers are a group of insects belonging to the suborder Caelifera. They are among what is possibly the most ancient living group of chewing herbivorous insects, dating back to the early Triassic around 250 million years ago. Grasshopp ...

s and occasional

scorpion Scorpions are predatory arachnids of the order Scorpiones. They have eight legs, and are easily recognized by a pair of grasping pincers and a narrow, segmented tail, often carried in a characteristic forward curve over the back and always end ...

s.UTtexas.edu
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Parasites

As a result of a diet of primarily lizard prey, which are hosts for physalopteran

nematodes The nematodes ( or grc-gre, Νηματώδη; la, Nematoda) or roundworms constitute the phylum Nematoda (also called Nemathelminthes), with plant-parasitic nematodes also known as eelworms. They are a diverse animal phylum inhabiting a broa ...

, this species in the wild has a higher prevalence and intensity of larval cysts in the stomach tissue and body cavity than any other species of monitor lizard. However, the development of worms are arrested in a cystic stage in ''V. eremius'', reducing the burden of adult worms on the host's body.

References

Mampam.com
(Retrieved Aug. 10, 2010) {{Taxonbar, from=Q3011587 Varanus Monitor lizards of Australia Reptiles described in 1895