Pseudechis

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]}

Pseudechis
type species Pseudechis porphyriacus, the red-bellied black snake
Scientific classification
Domain:	Eukaryota
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.^[1]

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]}

Image	Scientific Name	Common Name	Distribution
	Pseudechis australis (Gray, 1842)	king brown snake, mulga snake	northern, western, and Central Australia
	Pseudechis butleri L.A. Smith, 1982	Butler's black snake, Butler's snake, spotted mulga snake	Western Australia
	Pseudechis colletti Boulenger, 1902	Collett's black snake, Collett's cobra, Collett's snake, Down's tiger snake	Australia
	Pseudechis guttatus De Vis, 1905	blue-bellied black snake, spotted black snake	south-eastern Queensland and northern New South Wales.
	Pseudechis pailsei (Hoser, 1998)	eastern dwarf mulga snake, eastern pygmy mulga snake, false king brown snake	Australia
	Pseudechis papuanus W. Peters & Doria, 1878	Papuan black snake	New Guinea
	Pseudechis porphyriacus (Shaw, 1794)	Australian black snake, common black snake, red-bellied black snake, redbelly	Australia
	Pseudechis rossignolii (Hoser, 2000)	Papuan pygmy mulga snake	New Guinea
	Pseudechis weigeli (Wells & Wellington, 1987)	pygmy king brown snake, pygmy mulga snake	Australia

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

References

1. 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. "Horner, Paul (June 2012). "Genus Pseudechis Wagler, 1830". Australian Faunal Directory. Australian Government Department of the Environment and Energy.
3. 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. 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. S2CID 26068662.
6. 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) {{cite journal}}: External link in |quote= (help)
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

• Boulenger GA (1896). Catalogue of the Snakes in the British Museum (Natural History). Volume III., Containing the Colubridæ (Opisthoglyphæ and Proteroglyphæ) ... London: Trustees of the British Museum (Natural History). (Taylor and Francis, printers). xiv + 727 pp. + Plates I-XXV. (Genus Pseudechis, pp. 327–328).
• Wagler J (1830). Natürliches System der AMPHIBIEN, mit vorangehender Classification der SÄUGTHIERE und VÖGEL. Ein Beitrag zur vergleichenden Zoologie. Munich, Stuttgart and Tübingen: J.G. Cotta. vi + 354 pp. + one plate. (Pseudechis, new genus, p. 171). (in German and Latin).