Inland taipan
| Fierce Snake (Inland Taipan) | |
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| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Reptilia |
| Order: | Squamata |
| Suborder: | Serpentes |
| Family: | Elapidae |
| Genus: | Oxyuranus |
| Species: | O. microlepidotus |
| Binomial name | |
| Oxyuranus microlepidotus (McCoy, 1879) |
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| Range of Inland Taipan (in red) | |
The Inland Taipan (Oxyuranus microlepidotus), also known as the Small Scaled Snake and Fierce Snake, is native to Australia and is regarded as the most venomous land snake in the world based on LD50 values in mice.[1] It is a species of taipan belonging to the Elapidae family. Although highly venomous, it is very shy and reclusive, and always prefers to escape from threat (the word "fierce" from its alternative name describes its venom, not its temperament).[2]
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Appearance [edit]
The Inland Taipan is dark tan, ranging from a rich, dark hue to a brownish light-green, depending on season. Its back, sides and tail may be different shades of brown and grey, with many scales having a wide blackish edge. These dark-marked scales occur in diagonal rows so that the marks align to form broken chevrons of variable length that are inclined backward and downward. The lowermost lateral scales often have an anterior yellow edge. The dorsal scales are smooth and without keels. The round-snouted head and neck are usually noticeably darker than the body (glossy black in winter, dark brown in summer), the darker colour allowing the snake to heat itself while only exposing a smaller portion of the body at the burrow entrance. The eye is of average size with a blackish brown iris and without a noticeable coloured rim around the pupil. It has twenty-three rows of mid-body scales, between fifty-five and seventy divided subcaudal scales, and one anal scale. The Inland Taipan averages approximately 1.8 metres (5.9 ft) in length, although larger specimens can reach lengths of 2.5 metres (8.2 ft).[3]
Seasonal adaptation [edit]
Inland taipans adapt to their environment by changing the color of the skin during seasonal changes. They tend to become lighter during summer and darker during the winter. This seasonal color change serves the purpose of thermoregulation, allowing the snake to absorb more light in the colder months.
Geographical distribution [edit]
The inland taipan is native to the arid regions of central to eastern Australia. Its range extends from the southeast part of the Northern Territory into west Queensland. The snake can also be found north of Lake Eyre and to the west of the split of the Murray River, Darling River, and Murrumbidgee River.
Behavior [edit]
Diet [edit]
The Inland Taipan consumes mostly rodents, small mammals and birds. Unlike other venomous snakes that strike with a single accurate bite then retreat while waiting for the prey to die, the Inland Taipan is known to deliver up to seven venomous bites in a single attack.
Reproduction [edit]
Inland Taipan produce clutches of between one and two dozen eggs. The eggs hatch two months later. The eggs are usually laid in abandoned animal burrows and deep crevices. Reproduction rate depends in part on their diet. If there is not enough food then the snake will reproduce less.
Venom [edit]
The inland taipan's venom consists of Taipoxin and protease enzymes. The average quantity of venom delivered by this species is 44 mg and the maximum dose recorded is 110 mg. The median lethal dose (LD50) for mice is 2 μg/kg (ppb) for pure Taipoxin[4] and 30 μg/kg (ppb) for the natural venom mixture.[5] Its venom consists mostly of neurotoxins. Almost all positively identified inland taipan bite victims have been herpetologists handling the snakes for study, and all were treated successfully with antivenom—no recorded incidents have been fatal since the advent of the specific antivenom therapy.[6][7]
Gallery [edit]
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Brown coloured (winter)
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Olive coloured (summer)
References [edit]
- ^ LD50, seanthomas.net (December 1999).
- ^ "Our Animals – Reptiles – Venomous Snakes – Fierce Snake". Australia Zoo. Retrieved 2009-05-21.
- ^ "Fierce Snake (Inland Taipan)". Australian Reptile Park. Retrieved 2009-11-07.
- ^ Fohlman, J.; Eaker, D.; Karlsoon, E. and Thesleff, S. (1976). "Taipoxin, an extremely potent presynaptic neurotoxin from the venom of the australian snake taipan (Oxyuranus s. scutellatus). Isolation, characterization, quaternary structure and pharmacological properties". Eur. J. Biochem. 68 (2): 457–69. doi:10.1111/j.1432-1033.1976.tb10833.x. PMID 976268.
- ^ "Strength of Venom". School of Chemistry, University of Bristol. Retrieved 2008-02-29.
- ^ Barrett, Robyn; Mark Little (Oct–Dec 2003). "Five years of snake envenoming in far north Queensland". Emergency Medicine 15 (5–6): 500–510. doi:10.1046/j.1442-2026.2003.00509.x. PMID 14992068.
- ^ White, Julian (November 1991). "Oxyuranus microlepidotus". Chemical Safety Information from Intergovernmental Organizations. Retrieved 24 July 2009.
External links [edit]
Media related to Oxyuranus microlepidotus at Wikimedia Commons
