Egernia | |
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Stokes's skink, (Egernia stokesii), a small species of Egernia sensu stricto | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Reptilia |
Order: | Squamata |
Family: | Scincidae |
Subfamily: | Egerniinae |
Genus: | Egernia Gray, 1832 |
Species | |
See text | |
Synonyms | |
Contundo Wells & Wellington, 1984 Contents |
Egernia is a genus of skinks (family Scincidae) that occurs in Australia. These skinks are ecologically diverse omnivores that inhabit a wide range of habitats. However, in the loose delimitation (which incorporates about 30 species) the genus is not monophyletic but an evolutionary grade, as has long been suspected due to its lack of characteristic apomorphies. [1]
Some of the skinks traditionally placed in Egernia appear to be among the most intelligent squamates. They have been shown to be able to distinguish between relatives and unrelated conspecifics, and can recognize relatives individually. Several species form monogamous pair-bonds. For instance, the black rock skink is a species who can perform kin discrimination based on scent and form monogamous pair-bonds and a nuclear family structure. [2] Most of these species belong to Egernia sensu stricto , and similar behaviour is also known in the related Solomon Islands skink (Corucia zebrata). The latter means that the high intelligence and social skills are probably plesiomorphic for the Egernia genus-group as a whole, and that the solitary species appear to have evolved towards being less intelligent and social again. It may still be, however, that the intelligent behaviour is a homoplasy that evolved several times in the Egernia genus-group; the fact that Corucia is a monotypic and rather distinct genus makes it impossible to decide at present. [1] [3]
It is the namesake genus of the Egernia genus-group, which also includes the Solomon Islands skink (Corucia), Cyclodomorphus and the blue-tongued skinks (Tiliqua). In some older works, it is considered closely related to Mabuya , but even among the subfamily Lygosominae this genus does not seem to be particularly closely related and would—were the genus-groups treated at the rarely used rank of infrafamily—certainly constitute an infrafamily of its own. On the other hand, the enigmatic crocodile skinks (Tribolonotus) might be a very basal member of the Egernia genus-group. [3]
The genus Egernia proper, as well as the other lineages, appear to be of Miocene—probably Early Miocene—origin, meaning they radiated at least 15, maybe 20 million years ago (mya). There are fossils of Egernia-like Lygosominae from around the Oligocene-Miocene boundary 23 mya, but these cannot be assigned to the present genus with certainty. Rather, they appear to be basal members of the Egernia genus-group, still very plesiomorphic Lygosominae with a habitus similar to Mabuya . [1]
Mid-sized to large skinks (adult snout-vent length 100–240 mm) with a bulky, usually somewhat flattened body and small eyes. 24–46 rows of midbody scales; dorsal scales smooth, ridged, keeled or spiny (the tail is often notably spiny). The nasal scale has a postnarial groove; the subocular scale row is incomplete. Eyelids similar in colour to the adjacent scales. [1]
Image | Scientific Name | Common Name | Distribution |
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Egernia cunninghami (Gray, 1832) | Cunningham's spiny-tailed skink | southeastern Australia. | |
Egernia cygnitos Doughty, Kealley & Donnellan, 2011 | Western Pilbara spiny-tailed skink | northwestern Australia | |
Egernia depressa (Günther, 1875) | pygmy spiny-tailed skink | Western Australia, the Northern Territory and South Australia. | |
Egernia douglasi Glauert, 1956 | Kimberley crevice-skink | Western Australia. | |
Egernia eos Doughty, Kealley & Donnellan, 2011 | central pygmy spiny-tailed skink | western Australia | |
Egernia epsisolus Doughty, Kealley & Donnellan, 2011 | Eastern Pilbara spiny-tailed skink | northwestern Australia | |
Egernia formosa Fry, 1914 | Goldfield's crevice-skink | northwestern Australia | |
Egernia hosmeri Kinghorn, 1955 | Hosmer's spiny-tailed skink | Queensland and the Northern Territory. | |
Egernia kingii (Gray, 1838) | King's skink | northwestern Australia | |
Egernia mcpheei Wells & Wellington, 1984 | eastern crevice-skink, McPhee's egernia | Australia. | |
Egernia napoleonis (Gray, 1838) | southwestern crevice-skink | western Australia. | |
Egernia pilbarensis Storr, 1978 | Pilbara crevice-skink | western Australia. | |
Egernia richardi (W. Peters, 1869) | bright crevice-skink, dark spiny-tailed skink | South Australia and Western Australia. | |
Egernia roomi (Wells and Wellington, 1985) | New South Wales. | ||
Egernia rugosa De Vis, 1888 | Yakka skink [4] | Queensland in eastern Australia | |
Egernia saxatilis Cogger, 1960 | Black rock skink, black crevice-skink | Eastern and Southern Australia from central New South Wales to Grampians National Park in Victoria | |
Egernia stokesii (Gray, 1845) | gidgee spiny-tailed skink, gidgee skink, Stokes's skink | Australia | |
Egernia striolata (W. Peters, 1870) | tree crevice-skink, "tree skink" | Victoria, the Northern Territory, Queensland, New South Wales and South Australia. | |
Nota bene : A binomial authority in parentheses indicates that the species was originally described in a genus other than Egernia.
Cladistic analysis of NADH dehydrogenase subunit 4, 12S rRNA, c-mos and β-fibrinogen intron 7 DNA sequence data delimits 3 clades, Bellatorias , Liopholis , and Lissolepis in Egernia sensu lato , which are best regarded as separate genera — as had already been often proposed in former times, as early as the 19th century. [1]
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.
Carinascincus is a genus of skinks, commonly called snow skinks or cool-skinks and residing mainly in Tasmania or Victoria, Australia. Then recognised as the genus Niveoscincus, it was found to belong to a clade with the genera Carlia, Lampropholis and others of the Eugongylus group within Lygosominae. Cogger has rejected the use of the junior name Niveoscincus and recognizes the valid senior generic name Carinascincus for the group. For similar skinks see genera Pseudemoia, Lampropholis, and Bassiana. These skinks have adapted to the cooler weather of southern Australia and particularly Tasmania, hence the common names.
Blue-tongued skinks comprise the Australasian genus Tiliqua, which contains some of the largest members of the skink family (Scincidae). They are commonly called blue-tongued lizards or simply blue-tongues or blueys in Australia or panana in Indonesia. As suggested by these common names, a prominent characteristic of the genus is a large blue tongue that can be bared as bluff-warning to potential enemies. The type of predator/threat that is near will determine the intensity of colour present in the tongue. The tongue can also deform itself and produce a thick mucus in order to catch prey. They are relatively shy in comparison with other lizards, and also significantly slower due to their shorter legs.
Eutropis dawsoni, also known commonly as Gans's grass skink and Gans's mabuya, is a species of lizard in the family Scincidae. The species is endemic to the southern Western Ghats, India.
Eutropis multifasciata, commonly known as the East Indian brown mabuya, many-lined sun skink, many-striped skink, common sun skink or (ambiguously) as golden skink, is a species of skink.
Lygosominae is the largest subfamily of skinks in the family Scincidae. The subfamily can be divided into a number of genus groups. If the rarely used taxonomic rank of infrafamily is employed, the genus groups would be designated as such, but such a move would require a formal description according to the ICZN standards.
Chioninia is a genus of skinks, lizards in the subfamily Lygosominae. For long, this genus was included in the "wastebin taxon" Mabuya. The genus Chioninia contains the Cape Verde mabuyas.
The Noronha skink is a species of skink from the island of Fernando de Noronha off northeastern Brazil. It is covered with dark and light spots on the upperparts and is usually about 7 to 10 cm in length. The tail is long and muscular, but breaks off easily. Very common throughout Fernando de Noronha, it is an opportunistic feeder, eating both insects and plant material, including nectar from the Erythrina velutina tree, as well as other material ranging from cookie crumbs to eggs of its own species. Introduced predators such as feral cats prey on it and several parasitic worms infect it.
Liopholis is a genus of skinks, lizards in the family Scincidae. Species of the genus are found in the Australian region. They were previously placed in the genus Egernia.
Concinnia is a genus of skinks in the subfamily Lygosominae.
Lissolepis is a genus of mid-sized skinks with a bulky angular body and small eyes. 20–28 rows of midbody scales; dorsal scales smooth. The nasal scale has a postnarial groove; the subocular scale row is complete. Eyelids similar in colour to the adjacent scales. They were previously placed in the genus Egernia.
Egernia stokesii is a gregarious species of lizard of the Scincidae family. This diurnal species is endemic to Australia, and is also known as the Gidgee skink, spiny-tailed skink, Stokes's skink and Stokes's egernia. The species forms stable, long-term social aggregations, much like the social groups seen in mammalian and avian species. This characteristic is rarely found in the Squamata order, but is widespread within the Australian subfamily of Egerniinae skinks. Populations of E. stokesii are widely distributed, but fragmented, and occur in semi-arid environments. There are three recognised subspecies. The conservation status for the species is listed as least concern, however, one subspecies is listed as endangered.
The tree-crevice skink or tree skink (Egernia striolata) is a species of skink, a lizard in the family Scincidae. The species is endemic to Australia and is found in the states of Victoria, the Northern Territory, Queensland, New South Wales and South Australia. E. striolata tend to live in crevices and cracks in hollow logs or rocks. They greatly prefer heterogeneous and structurally diverse habitats and their behavior changes depending on the habitat they live in.
The major skink is a species of lizard in the family Scincidae. The species is native to part of Australia and part of Australasia.
The black rock skink is a species of large skink native to Eastern and Southern Australia from central New South Wales to Grampians National Park in Victoria. A large, dark colored skink, up to 135 mm from snout to base of the tail, the black rock skink is the first reptile discovered to have a "nuclear family" structure where the parents form a pair and care for their offspring for more than one year. The black rock skink is a viviparous skink meaning females give birth to live offspring instead of laying eggs. They defend their home range and families against conspecifics for up to several years.
Egerniinae is the subfamily of social skinks within the family Scincidae. The genera in this subfamily were previously found to belong the Egernia group in the large subfamily Lygosominae.
Mabuyinae is a subfamily of lizards, commonly known as skinks, within the family Scincidae. The genera in this subfamily were previously found to belong the Mabuya group in the large subfamily Lygosominae.
The bull skink, southern sand-skink or southernheath skink is a species of terrestrial skink, a lizard in the family Scincidae. It is one of eleven species within the Liopholis genus.
Slater's desert skink, also known commonly as the Centralian Floodplains desert-skink, Slater's egernia, and Slater's skink, is a species of lizard in the family Scincidae. The species is endemic to Australia. There are two recognized subspecies.
Trachylepis nancycoutuae, also known commonly as Nancy Coutu's mabuya and Nancy Coutu's skink, is a species of lizard in the family Scincidae. The species is endemic to Madagascar.