Speckled brown snake

The speckled brown snake or spotted brown snake (Pseudonaja guttata) is a species of venomous elapid snake native to northeastern Australia.[1][2]

Speckled brown snake
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Squamata
Suborder: Serpentes
Family: Elapidae
Genus: Pseudonaja
Species:
P. guttata
Binomial name
Pseudonaja guttata
(Parker, 1926)
Synonyms[1][2]

Demansia guttata Parker, 1926


Taxonomy

English zoologist Hampton Wildman Parker described the speckled brown snake as Demansia guttata in 1926 from a specimen collected in Winton, Queensland.[1] The brown snakes were moved to Pseudonaja by Australian naturalist Eric Worrell in the early 1960s on the basis of skull morphology, and reinforced by American herpetologist Samuel Booker McDowell in 1967 on the basis of the muscles of the venom glands. This classification has been followed by subsequent authors.[3] A 2005 analysis using mitochondrial DNA found that the speckled brown snake was an early offshoot of the genus, with the taipans as more distantly related.[4] A 2016 genetic analysis showed that the speckled brown snake was an early offshoot of a lineage giving rise to the taipans, rather than the other brown snakes.[5]

Description

The speckled brown snake grows to 1.4 m (4 ft 7 in) long. It has a small head, straw-yellow to orange upper parts, white throat and lips, and cream, yellow, or white under parts blotched with orange. Its scales have black edges that become visible when the snake bends or moves. Some snakes have wide, darker bands.[6] It has 19–21 rows of dorsal scales at midbody, 190 to 220 ventral scales, 44 to 70 divided subcaudal scales (occasionally some of the anterior ones are undivided), and a divided anal scale.[6] It is found in the eastern Northern Territory, western Queensland, and far northern South Australia.[6] It lays a clutch of six eggs on average.[7]

Distribution

The speckled brown snake occurs in the Channel Country, Mitchell Grass Downs, and Mount Isa Inlier[1] in Northern Territory, Queensland, and South Australia.[1][2]

Trophic relations

Frogs and lizards make up a large proportion of its diet, though it also eats small birds and mammals.[7] Its venom is 1.6 times as toxic as that of the Indian cobra (Naja naja).[6]

The curl snake (Suta suta) has been reported preying on speckled brown snakes at Goyder Lagoon in South Australia.[6]

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References
  1. Australian Biological Resources Study (26 August 2013). "Species Pseudonaja guttata (Parker, 1926)". Australian Faunal Directory. Canberra, Australian Capital Territory: Department of the Environment, Water, Heritage and the Arts, Australian Government. Retrieved 6 October 2017.
  2. Dipsas pakaraima at the Reptarium.cz Reptile Database. Accessed 1 October 2018.
  3. Mengden, Gregory A. (1983). "The taxonomy of Australian elapid snakes: a review" (PDF). Records of the Australian Museum. 35 (5): 195–222. [202]. doi:10.3853/j.0067-1975.35.1983.318.
  4. Skinner, Adam; Donnellan, Stephen C.; Hutchinson, Mark N.; Hutchinson, Rhonda G. (2005). "A phylogenetic analysis of Pseudonaja (Hydrophiinae, Elapidae, Serpentes) based on mitochondrial DNA sequences". Molecular Phylogenetics and Evolution. 37 (2): 558–71. doi:10.1016/j.ympev.2005.06.020. PMID 16098768.
  5. Figueroa, A.; McKelvy, A. D.; Grismer, L. L.; Bell, C. D.; Lailvaux, S. P. (2016). "A species-level phylogeny of extant snakes with description of a new colubrid subfamily and genus". PLoS ONE. 11 (9): e0161070. doi:10.1371/journal.pone.0161070. ISBN 9780643106741. PMC 5014348. PMID 27603205.
  6. Mirtschin, Peter; Rasmussen, Arne; Weinstein, Scott (2017). Australia's Dangerous Snakes: Identification, Biology and Envenoming. Csiro Publishing. pp. 128–29. ISBN 9780643106741.
  7. Shine, Richard (1989). "Constraints, allometry, and adaptation: food habits and reproductive biology of Australian brownsnakes (Pseudonaja: Elapidae)". Herpetologica. 45 (2): 195–207. JSTOR 3892162.
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