Pseudechis

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Pseudechis
Red belly.jpg
type species Pseudechis porphyriacus , the red-bellied black snake
Scientific classification Red Pencil Icon.png
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Squamata
Suborder: Serpentes
Family: Elapidae
Subfamily: Hydrophiinae
Genus: Pseudechis
Wagler, 1830
Type species
Coluber porphyriacus Shaw, 1794
Species

At least nine, see text

Phylogenetic tree of species within Pseudechis. The NT dwarf form is an undescribed species. After Maddock et al. 2017. Pseudechis Bayesian species tree.png
Phylogenetic tree of species within Pseudechis. The NT dwarf form is an undescribed species. After Maddock et al. 2017.

Pseudechis is a genus of venomous snakes in the family Elapidae. It contains the group of elapid species commonly referred to as the black snakes. Species of Pseudechis are found in every Australian state with the exception of Tasmania, and some species are found in Papua New Guinea. They inhabit a variety of habitat types, from arid areas to swampland. All species are dangerous (Pseudechis signifying "like a viper", Greek echis ) and can inflict a potentially lethal bite. Most snakes in this genus reach about 2 m (6.6 ft) in total length (including tail), and vary in colour. Some species are brown, whereas others are black. The most recognisable and widespread species in the genus are the red-bellied black snake (P. porphyriacus) and the mulga snake (king brown) (P. australis). These snakes feed on lizards, frogs, birds, small mammals, and even other snakes. All species of Pseudechis lay eggs with the exception of the red-bellied black snake P. porphyriacus which is viviparous. The genus Pailsus is a synonym of Pseudechis, and more work is needed to understand species limits among the smaller species of the group. [2] [3] [4] [5] [6] [7]

Contents

Taxonomy

The genus was established in 1860 by Johann Wagler, separating a species previously described by George Shaw in the new combination Pseudechis porphyriacus as a monotypic genus. The systematic revision of the elapid family by George Albert Boulenger in 1896 allied the descriptions of eight species, and by 1933 the number totalled taxa assigned to the genus. A revision of Pseudechis by Roy D. Mackay in 1955 placed many of these descriptions in synonymy, [8] reducing the number of recognised species to five. The examination of a large series of specimens of the king brown Pseudechis australis was undertaken by Laurie Smith, recognising clinal variability within the population and separating a form with significant distinctions in morphology as a sixth species of the genus, Pseudechis butleri . [9] [2]

The taxonomy of snakes of the genus Pseudechis is unsettled, with at least one species undescribed; several recent phylogenetic studies have provided evidence of the presence of species beyond the six recognised in most books. [1] [2] [3] [5] [6] [10] [11]

ImageScientific NameCommon NameDistribution
Pseudechis australis ugmedia.jpg Pseudechis australis (Gray, 1842)king brown snake, mulga snakenorthern, western, and Central Australia
Pseudechis butleri L.A. Smith, 1982 Butler's black snake, Butler's snake, spotted mulga snakeWestern Australia
Serpent de collett ou pseudoechis colletti.jpg Pseudechis colletti Boulenger, 1902 Collett's black snake, Collett's cobra, Collett's snake, Down's tiger snakeAustralia
Pseudechis guttatus De Vis, 1905blue-bellied black snake, spotted black snakesouth-eastern Queensland and northern New South Wales.
Pseudechis pailsei (Hoser, 1998)eastern dwarf mulga snake, eastern pygmy mulga snake, false king brown snakeAustralia
Pseudechis papuanus W. Peters & Doria, 1878Papuan black snakeNew Guinea
Pseudechis porphyriacus (35307320466).jpg Pseudechis porphyriacus (Shaw, 1794)Australian black snake, common black snake, red-bellied black snake, redbellyAustralia
Pseudechis rossignolii (Hoser, 2000)Papuan pygmy mulga snakeNew Guinea
Pseudechis weigeli (Wells & Wellington, 1987)pygmy king brown snake, pygmy mulga snakeAustralia

Nota bene : A binomial authority in parentheses indicates that the species was originally described in a genus other than Pseudechis.

Related Research Articles

Elapidae Family of venomous snakes

Elapidae is a family of venomous snakes characterized by their permanently erect fangs at the front of the mouth. Many members of this family are also recognized by their threat display of rearing upwards while spreading the neck-flap. Elapids are endemic to tropical and subtropical regions around the world, with terrestrial forms in Asia, Australia, Africa, and the Americas alongside marine forms in the Pacific and Indian Oceans. Members of the family have a wide range of sizes, from the 18 cm (7.1 in) white-lipped snake to the 5.85 m king cobra. Most species have neurotoxins in their venom which is channeled by their hollow fangs, while some may contain other toxic components in various proportions. The family includes 55 genera with some 360 species and over 170 subspecies.

<i>Acanthophis</i> Genus of elapid snakes commonly called death adders

Acanthophis is a genus of elapid snakes. Commonly called death adders, they are native to Australia, New Guinea and nearby islands, and are among the most venomous snakes in the world. The name of the genus derives from the Ancient Greek akanthos/ἄκανθος ('spine') and ophis/ὄφις ('snake'), referring to the spine on the death adder's tail.

Eastern brown snake Highly venomous snake native to Australia

The eastern brown snake, often referred to as the common brown snake, is a species of highly venomous snake in the family Elapidae. The species is native to eastern and central Australia and southern New Guinea. It was first described by André Marie Constant Duméril, Gabriel Bibron, and Auguste Duméril in 1854. The adult eastern brown snake is up to 2 m (7 ft) long with a slender build. Its variable upper parts can be several shades of brown, ranging from pale brown to almost black, while its underside is pale cream-yellow, often with orange or grey splotches. The eastern brown snake is found in most habitats except dense forests. It has become more common in farmland and on the outskirts of urban areas, benefiting from agriculture due to the increased numbers of its main prey, the introduced house mouse. The species is oviparous. The snake is considered to be a least-concern species according to the International Union for Conservation of Nature (IUCN), though its status in New Guinea is unclear.

Red-bellied black snake Venomous snake native to eastern Australia

The red-bellied black snake is a species of venomous snake in the family Elapidae, indigenous to Australia. Originally described by George Shaw in 1794 as a species new to science, it is one of eastern Australia's most commonly encountered snakes. Averaging around 1.25 m in length, it has glossy black upperparts, bright red or orange flanks, and a pink or dull red belly. It is not aggressive and generally retreats from human encounters, but can attack if provoked. Although its venom can cause significant illness, no deaths have been recorded from its bite, which is less venomous than other Australian elapid snakes. The venom contains neurotoxins, myotoxins, and coagulants and has haemolytic properties. Victims can also lose their sense of smell.

<i>Pseudonaja</i> Genus of snakes

Pseudonaja is a genus of highly venomous elapid snakes native to Australia. Species of this genus are known commonly as brown snakes and are considered to be some of the most dangerous snakes in the world; even young snakes are capable of delivering a fatal envenomation to a human.

<i>Naja</i> Genus of snakes

Naja is a genus of venomous elapid snakes known as cobras. Members of the genus Naja are the most widespread and the most widely recognized as "true" cobras. Various species occur in regions throughout Africa, Southwest Asia, South Asia, and Southeast Asia. Several other elapid species are also called "cobras", such as the king cobra and the rinkhals, but neither are true cobras. They are not true cobras in that they do not belong to the genus Naja, but instead each belong to monotypic genera Hemachatus and Ophiophagus.

Natricinae Subfamily of snakes

The Natricinae are a subfamily of colubroid snakes, sometimes referred to as a family (Natricidae). The subfamily comprises 37 genera. Members include many very common snake species, such as the European grass snakes, and the North American water snakes and garter snakes. Some Old World members of the subfamily are known as keelbacks, because their dorsal scales exhibit strong keeling.

Boulengerina Genus of snakes

Boulengerina is a genus or subgenus of elapid venomous snakes known commonly as water cobras, so named because of their semiaquatic nature. The genus has two recognised species, which are native to central and southern Africa.

Many-banded snake Species of snake

The many-banded snake, also known as the burrowing cobra is a species of venomous elapid snake. The species is found in the Republic of Congo, the Democratic Republic of Congo and Cameroon in Africa.

King brown snake Highly venomous Australian snake

The king brown snake is a species of highly venomous snake of the family Elapidae, native to northern, western, and Central Australia. Despite its common name, it is a member of the genus Pseudechis and only distantly related to true brown snakes. Its alternative common name is the mulga snake, although it lives in many habitats apart from mulga. First described by English zoologist John Edward Gray in 1842, it is a robust snake up to 3.3 m (11 ft) long. It is variable in appearance, with individuals from northern Australia having tan upper parts, while those from southern Australia are dark brown to blackish. Sometimes, it is seen in a reddish-green texture. The dorsal scales are two-toned, sometimes giving the snake a patterned appearance. Its underside is cream or white, often with orange splotches. The species is oviparous. The snake is considered to be a least-concern species according to the International Union for Conservation of Nature, though may have declined with the spread of the cane toad.

Colletts snake Highly venomous snake native to northeastern Australia

Collett's snake, also commonly known as Collett's black snake, Collett's cobra, or Down's tiger snake, is a species of venomous snake in the family Elapidae. The species is native to Australia. Although Collett's snake is not as venomous as other Australian snakes, it is capable of delivering a fatal bite, ranking nineteenth in the world's most venomous snakes.

Raymond Terrence Hoser is an Australian snake-catcher and author. Since 1976, he has written books and articles about official corruption in Australia. He has also written works on Australian frogs and reptiles. Hoser's work on herpetology is controversial, including his advocacy of the surgical alteration of captive snakes to remove their venom glands and his self-published herpetological taxonomy, which has been described as "taxonomic vandalism".

The spotted mulga snake is a species of venomous snake in the family Elapidae. The species is endemic to Western Australia. It is a member of the genus Pseudechis, dangerously venomous snakes that can intimidate an opponent by raising the head and presenting a hood. This cobra-like threat display is supported by the ability to produce a very large amount of venom.

Coastal taipan Highly venomous snake native to eastern and northern Australia

The coastal taipan, or common taipan, is a species of highly venomous snake in the family Elapidae. Described by Wilhelm Peters in 1867, the species is native to the coastal regions of northern and eastern Australia and the island of New Guinea. The second longest venomous snake in Australia, the coastal taipan averages around 2 m (6.6 ft) long, with the longest specimens reaching 2.9 m (9.5 ft) in length. It has light olive or reddish-brown upperparts, with paler underparts. The snake is considered to be a least-concern species according to the International Union for Conservation of Nature (IUCN).

The Papuan black snake is a venomous snake of the family Elapidae native to New Guinea. Reaching around 2 m (7 ft) in length, it is a predominantly black snake coloured grey underneath.

Smooth-scaled death adder Species of snake

The smooth-scaled death adder is a species of venomous snake in the family Elapidae. The species is endemic to Southeast Asia and Oceania.

The eastern dwarf mulga snake, also known commonly as the eastern pygmy mulga snake and the false king brown snake, is a species of venomous snake in the family Elapidae. The species, which is native to Australia, was genetically confirmed as a distinct species in 2017.

The pygmy mulga snake, also commonly known as the pygmy king brown snake, is a species of venomous snake in the black snake genus Pseudechis in the family Elapidae. The species is native to Australia.

The Papuan pygmy mulga snake is a venomous snake of the family Elapidae native to New Guinea, genetically confirmed as a distinct species in 2017. It was originally described by Raymond Hoser in 2000 as Pailsus rossignolii, naming it for Victorian snake handler Fred Rossignoli.

Speckled brown snake Highly venomous snake native to northeastern Australia

The speckled brown snake or spotted brown snake is a species of venomous elapid snake native to northeastern Australia.

References

  1. 1 2 Maddock, Simon T.; Childerstone, Aaron; Fry, Bryan Grieg; Williams, David J.; Barlow, Axel; Wüster, Wolfgang (2017-02-01). "Multi-locus phylogeny and species delimitation of Australo-Papuan blacksnakes (Pseudechis Wagler, 1830: Elapidae: Serpentes)" (PDF). Molecular Phylogenetics and Evolution. 107: 48–55. doi:10.1016/j.ympev.2016.09.005. PMID   27637992.
  2. 1 2 3 "Horner, Paul (June 2012). "Genus Pseudechis Wagler, 1830". Australian Faunal Directory. Australian Government Department of the Environment and Energy.
  3. 1 2 Swan, Gerry (1995). A Photographic Guide to Snakes and other Reptiles of Australia. Sydney: New Holland. ISBN   1-85368-585-2.
  4. Pseudechis australis at the Reptarium.cz Reptile Database
  5. 1 2 Kuch, U.; Keogh, J.S.; Weigel, J.; Smith, L.A.; Mebs, D. (2005). "Phylogeography of Australia's king brown snake (Pseudechis australis) reveals Pliocene divergence and Pleistocene dispersal of a top predator". Naturwissenschaften. 92 (3): 121–127. Bibcode:2005NW.....92..121K. doi:10.1007/s00114-004-0602-0. PMID   15688185.
  6. 1 2 Wüster W, Dumbrell AJ, Hay C, Pook CE, Williams DJ, Fry BG (2005). "Snakes across the Strait: Trans-Torresian phylogeographic relationships in three genera of Australasian snakes (Serpentes: Elapidae: Acanthophis, Oxyuranus and Pseudechis)" (PDF). Molecular Phylogenetics and Evolution. 34 (1): 1–14. doi:10.1016/j.ympev.2004.08.018. PMID   15579378. Archived from the original (PDF) on 2007-02-03. superseding; Wüster, W., et al. Phylogeny and classification of Australo-Papuan black snakes and mulga snakes: comments on genus Pailsus Hoser (1998)
  7. Wüster W, Golay P, Warrell DA (August 1999). "Synopsis of recent developments in venomous snake systematics, No. 3" (PDF). Toxicon. 37 (8): 1123–9. doi:10.1016/S0041-0101(98)00248-7. PMID   10400296. Archived from the original (PDF) on 2007-07-21.
  8. Mackay, R.D. (1955). "A revision of the genus Pseudechis". Proceedings of the Royal Zoological Society of New South Wales. 74 (1953–54): 15–23.
  9. Mengden, G.A.; Shine, R.; Moritz, C. (1986). "Phylogenetic Relationships within the Australasian Venomous Snakes of the Genus Pseudechis". Herpetologica. 42 (2): 215–229. ISSN   0018-0831. JSTOR   3892390.
  10. "Reptiles / Squamata / Elapidae / Pseudechis ". Australian Reptile Online Database. Retrieved 16 May 2017.
  11. Pseudechis at the Reptarium.cz Reptile Database

Further reading