Earless skink

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Earless skinks
Lowland Earless Skink (Hemiergis peronii) (9389647025).jpg
Hemiergis peronii — Peron's earless skink or lowlands earless skink
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Squamata
Family: Scincidae
Subfamily: Sphenomorphinae
Genus: Hemiergis
Wagler, 1830
Type species
Tridactylus decresiensis
Cuvier, 1829
Species

7 species (see text)

The earless skinks form the genus Hemiergis in the skink family Scincidae. All earless skinks are native to Australia. [1] They are also called mulch skinks.

Contents

Description

Hemiergis skinks are small, slender fossorial lizards with reduced limbs and varying numbers of digits. [2] Depending on the species and population, individuals can have 2, 3, 4 or 5 fingers/toes.

Ventral surfaces are typically yellow to reddish orange. [3] Snout-vent lengths range from 42 mm to 89 mm [cite Wilson and Swan]. Dorsal surfaces are typically brown and may have dark brown or black paravertebral or dorsolateral stripes.

Variation in digit number between species and populations of Hemiergis has been used to better understand the influence of the Sonic hedgehog (Shh) gene on embryonic development. For example, one study found a clear correlation between adult digit number and duration of the SHH protein expression early in limb development, with reduced expression of the SHH protein correlated with fewer digits. [4] [5] .

Hemiergis means 'half worker', in reference to the short limbs that are characteristic of the genus. [6]

Hemiergis is closely related to the other Australian skink genera Anomalopus and Eremiascincus. [7] [8] .

Distribution

Hemiergis is an Australian genus, found across the southern end of the continent, with populations in the states of New South Wales, Victoria, South Australia, and Western Australia. [3]

Reproduction

Hemiergis are ovoviviparous, meaning the mother produces eggs which develop inside her and she gives birth to live young. [9] This is common in southern Australian (cold climate) reptiles. Clutch sizes range from 1 to 6. [10]

Ecology and habitat

Hemiergis individuals are typically found dwelling in loose damp soil under logs, rocks and leaf litter. [3]

Their diet consists of small invertebrates.

Species

There are seven species: [11] [12]

Two additional species, H. graciloides and H. maccoyi , have been included in this genus but both are now classified in other genera.

Related Research Articles

<span class="mw-page-title-main">Skink</span> Family of reptiles

Skinks are lizards belonging to the family Scincidae, a family in the infraorder Scincomorpha. With more than 1,500 described species across 100 different taxonomic genera, the family Scincidae is one of the most diverse families of lizards. Skinks are characterized by their smaller legs in comparison to typical lizards and are found in different habitats except arctic and subarctic regions.

Nannoscincus is a genus of small skinks, lizards in the family Scincidae. The genus is endemic to New Caledonia.

<i>Ophiomorus</i> Genus of lizards

Ophiomorus is a genus of Old World skinks. The limbs are either reduced or absent, depending on the species. They are sometimes known as limbless skinks or snake skinks. Members of the genus live under rocks or in burrows.

Pseudoacontias is genus of skinks, lizards in the family Scincidae.

<i>Typhlacontias</i> Genus of lizards

Typhlacontias is a genus of legless, burrowing skinks in the family Scincidae, a genus endemic to Sub-Saharan Africa. Its sister group is the clade consisting of the genera Feylinia and Melanoseps.

Kasner's dwarf burrowing skink, also known commonly as Kasner's burrowing skink, is a species of lizard in the family Scincidae. The species endemic to South Africa.

<span class="mw-page-title-main">Diploglossidae</span> Group of lizards

Diploglossidae is a family of anguimorph lizards native to the Americas, with most genera being endemic to Hispaniola. Most members of this family are known as galliwasps. They were formerly considered a subfamily of Anguidae, but genetic evidence has shown them to be less closely related to other members of Anguidae than Anniellidae is.

<i>Eulamprus quoyii</i> Species of lizard

Eulamprus quoyii, more commonly known as the eastern water skink, eastern water-skink, or golden water skink, is a viviparous species of diurnal skink. Eulamprus quoyii belongs to the family Scincidae and is considered a common garden animal in Australia. The skink is endemic to Australia and found only along the east coast of the country. It makes its home in creekside habitats along the east coast of Australia and in urban garden areas with high amounts of moisture. The species can be identified by the twin, long yellow stripes that run along its body from the top of the eye, as well as by several more specific character derived states. The pale yellow dorsolateral stripes are most likely where its common name, the golden water skink, is derived. Like other ectotherms, the skink can often be seen basking in the sun on rocky outcroppings in order to regulate its body temperature. Its diet mainly consists of both aquatic and terrestrial insects, tadpoles and small amounts of plant matter. The skink both hunts for food and scavenges when necessary and is considered an opportunistic feeder. It is prey to larger lizards, snakes, cats and birds and so will often be seen moving quickly into hiding when other organisms are present.

<i>Saiphos</i> Species of reptile

Saiphos equalis, commonly known as the yellow-bellied three-toed skink or simply three-toed skink, is a species of burrowing skink found in eastern Australia. It is the only species classified under the genus Saiphos.

<span class="mw-page-title-main">Two-toed earless skink</span> Species of lizard

The two-toed earless skink is a common species of skink found in coastal south-western, Western Australia. It is characterized by its long tail, an absence of ear-holes, shiny skin, yellow underside, and short weak limbs, each of which with only two toes. It can grow to be over 10 cm in length, however the average size is approximately 7.5 cm. It also exhibits a snake-like movement, and due to the small size and non-functionality of limbs in locomotion, it is often referred to as a legless lizard.

<i>Cryptoblepharus australis</i> Species of lizard

Cryptoblepharus australis, commonly called the inland snake-eyed skink, is a species of skink in the genus Cryptoblepharus.

<span class="mw-page-title-main">Centralian blue-tongued skink</span> Species of lizard

The Centralian blue-tongued skink or Centralian blue-tongue is a species of skink, occurring predominantly in the far north-west corner of New South Wales, Australia. It is one of six species belonging to the genus Tiliqua; the blue-tongued skinks and the shinglebacks. This species of reptile classifies as a lizard.

Emoia schmidti, also known commonly as Schmidt's emo skink or Schmidt's skink, is a species of lizard in the family Scincidae. The species is endemic to the Solomon Islands.

<i>Ctenotus leonhardii</i> Species of lizard

Ctenotus leonhardii, known by the common names Leonhardi's ctenotus, Leonhardi's skink or common desert ctenotus, is a species of skink found in a range of arid and semi-arid regions throughout mainland Australia. The species was named after German anthropologist Moritz von Leonhardi in 1919 and belongs to the genus Ctenotus, one of the largest genera of lizards in Australia.

Ctenotus youngsoni, also known commonly as the Shark Bay south-west ctenotus and Youngson's ctenotus, is a species of skink, a lizard in the family Scincidae. The species is endemic to Australia. The specific name, youngsoni, is in honour of Australian zoologist William Kenneth Youngson. C. youngsoni is found in the Australian state of Western Australia. The preferred natural habitat of C. youngsoni is shrubland. C. youngsoni has well-developed limbs, with five toes on each of its four feet. C. youngsoni is oviparous.

<i>Eremiascincus brongersmai</i> Species of lizard

Eremiascincus brongersmai, also known commonly as Brongersma's tree skink and the brown-sided bar-lipped skink, is a species of lizard in the family Scincidae. The species is endemic to the state of Western Australia.

<i>Hemiergis millewae</i> Species of reptile

The Hemiergis millewae, commonly known as the Millewa skink or Triodia earless skink, is a species of hemiergis lizards that is endemic to Australia. It is a specialist species, highly dependent on Spinifex for food and shelter, and has only been observed in semi-arid Mallee woodlands of southern and eastern Australia. It is considered endangered throughout parts of its range.

The Victoria three-toed earless skink is a species of skink found in New South Wales and Victoria in Australia.

<i>Lerista timida</i> Australian species of skink

Lerista timida, the dwarf three-toed slider or wood mulch-slider, is a species of skink found in Australia. Other common names for the species include timid slider and dwarf burrowing skink. The skink is a member of the Lerista genus which are confined to continental Australia and are mostly a burrowing species of skink. The genus consists of consists elongated, smooth-scaled, Fossorial lizards that are specialized for life in the upper soils and dry leaf litter through which they slide using Lateral undulation as a form of locomotive action, giving rise to their nickname as sliders. They normally emerge of a night-time to hunt for small Invertebrates such as ants, termites and insects. If disturbed, they dive immediately into any loose substrate to avoid predation, this behavior leaves behind a distinctive disrupted wavy track that often found on sandy flats or dunes, roads and tracks.

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.

References

  1. "Search results for Common name or synonym: Hemiergis". Reptarium.cz Reptile Database. Retrieved 28 March 2016.
  2. Cogger, Harold (2014). Reptiles and Amphibians of Australia (7th ed.). Collingwood, Victoria: CSIRO Publishing. ISBN   9781486309696.
  3. 1 2 3 Swan, Gerry; Wilson, Steve (2021). A Complete Guide to Reptiles of Australia (6th ed.). Wahroonga, Australia: Reed New Holland Publishers. ISBN   9781925546712.
  4. Shapiro, Michael D.; Hanken, James; Rosenthal, Nadia (2003-06-15). "Developmental basis of evolutionary digit loss in the Australian lizard Hemiergis". Journal of Experimental Zoology Part B: Molecular and Developmental Evolution. 297B (1): 48–56. doi:10.1002/jez.b.19. ISSN   1552-5007.
  5. Swank, Samantha; Sanger, Thomas J.; Stuart, Yoel E. (2021). "(Non)Parallel developmental mechanisms in vertebrate appendage reduction and loss". Ecology and Evolution. 11 (22): 15484–15497. doi:10.1002/ece3.8226. ISSN   2045-7758. PMC   8601893 . PMID   34824770.
  6. "Hemiergis". Australian Reptile Online Database. Retrieved 2024-10-06.
  7. Skinner, Adam; Hutchinson, Mark N.; Lee, Michael S. Y. (2013-12-01). "Phylogeny and divergence times of Australian Sphenomorphus group skinks (Scincidae, Squamata)". Molecular Phylogenetics and Evolution. 69 (3): 906–918. doi:10.1016/j.ympev.2013.06.014. ISSN   1055-7903.
  8. Reeder, Tod W; Reichert, Jennifer D (2011-03-14). "Phylogenetic Relationships within the Australian Limb-Reduced Lizard Genus Hemiergis (Scincidae: Squamata) as Inferred from the Bayesian Analysis of Mitochondrial rRNA Gene Sequences". Copeia. 2011 (1): 113–120. doi:10.1643/CH-09-096. ISSN   0045-8511.
  9. "Hemiergis gracilipes". Reptile Database. Retrieved 2024-10-06.
  10. Shine, Richard; Greer, Allen E. (1991). "Why Are Clutch Sizes More Variable in Some Species Than in Others?". Evolution. 45 (7): 1696–1706. doi:10.1111/j.1558-5646.1991.tb02675.x.
  11. Hemiergis at the Reptarium.cz Reptile Database. Accessed 28 March 2016 {{{year}}}.
  12. Stewart Macdonald. "Earless skinks Hemiergis - Wagler, 1830". Australian Reptile Online Database. Retrieved 28 March 2016.