Lexi Webster
Australia is known for its diverse range of spiders, with an estimated 10,000 species, of which only 2,700 have been described. The country is home to various spider families, including the well-known Sydney funnel-web spider, considered the most venomous spider in Australia and among the most feared globally. Other infamous species include the redback spider, known for its attraction to urban areas, and the peacock spider, with its colourful and distinctive fans. While most spiders in Australia are not dangerously toxic, some highly venomous species can inflict painful bites and even cause human fatalities.
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What You'll Learn
- Australia is home to approximately 10,000 spider species
- Many Australian spiders are venomous, including the Sydney funnel-web spider
- Spiders are found in a wide range of environments, from deserts to rainforests
- Spiders are distinct from other insects as they have eight legs and bodies divided into two parts
- The CSIRO is actively working on spider-related projects, including research on jumping spiders
Australia is home to approximately 10,000 spider species
The Salticidae family, commonly known as jumping spiders, includes 339 described species and a further 1,000 species that may be present. They are found in all terrestrial and arboreal habitats throughout Australia and are highly endemic, especially in central and western parts of the continent. The salticid faunas of the tropical and coastal habitats of eastern and northern Australia show a strong New Guinean and Oriental influence. Salticids are skillful jumpers that use their excellent vision to hunt in daylight.
The golden orb weaver, a small jumping spider with a metallic bronze body and iridescent markings, is nicknamed the "golden silk orb-weaver" due to its distinctive golden silk, which is one of the strongest natural fibres known. The Jovial Jumping Spider is another example of a jumping spider with exceptional jumping ability. They can leap several times their body length, allowing them to capture prey with impressive agility.
Several of Australia's spider species are highly venomous, including the Redback spider, the Funnel-web spider, the Mouse spider, and the White Tail spider. The Sydney Funnel-Web Spider, native to New South Wales, is considered the most venomous spider in Australia and among the most feared in the world. Its bite is powerful enough to pierce toenails, and its venom is so toxic that it can be fatal if not treated quickly. Fortunately, an anti-venom exists, and no deaths have occurred since 1981.
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Many Australian spiders are venomous, including the Sydney funnel-web spider
Australia is home to a wide variety of spiders, with estimates putting the total number of species at about 10,000. Many of these spiders are venomous, including the highly venomous Sydney funnel-web spider (Atrax robustus). This spider is native to eastern Australia and is typically found within a 100 km (62 mi) radius of Sydney. It is a member of the Australian funnel-web spider family, which includes 35 species, 38 of which are described.
The Sydney funnel-web spider is a medium to large spider, with a body length ranging from 1 to 5 cm. It is glossy and darkly coloured, ranging from blue-black to shades of brown or dark plum. It typically builds silk-lined burrows in moist, cool, sheltered habitats, such as under rocks, logs, or in rough-barked trees. They are often attracted to water and can be found in swimming pools, where they can survive immersion for up to 24 hours.
The Sydney funnel-web spider is highly venomous, and its bite can cause serious illness or death in humans if left untreated. The venom is particularly toxic to humans and other primates, affecting the nervous system. Male spiders are more likely to bite and are responsible for all recorded envenomation deaths. This is due to the presence of a unique component in their venom called Robustoxin (δ-Atracotoxin-Ar1). The lethal dose of venom in humans is not known, but it is known to be very toxic, with children being particularly vulnerable.
Since the introduction of an antivenom in 1981, there have been no recorded fatalities from Sydney funnel-web spider bites. However, it is important to treat all bites as potentially life-threatening. First aid treatment for a suspected bite includes immediately applying a pressure immobilization bandage and seeking medical attention.
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Spiders are found in a wide range of environments, from deserts to rainforests
Spiders are found in a wide range of environments in Australia, from arid deserts to tropical rainforests. The country is known for its diverse array of spiders, with an estimated total of about 10,000 species. Australia's unique geographical and ecological characteristics provide a haven for these arachnids, offering a variety of habitats to call home.
One of the most well-known Australian spiders is the Sydney funnel-web spider, often considered the world's most dangerous due to its highly venomous bite. This spider is typically found within a 100 km diameter circle around Sydney, including areas like Newcastle, Nowra, and Lithgow. Its relatives in the family Hexathelidae are also native to Australia and pose a significant threat with their venomous bites.
The Redback spider, distinguished by its brilliant red stripe, is another highly venomous species found throughout Australia. They thrive in the dark corners of human settlements, often hiding in unexpected places like wheely bin handles and under toilet seats. While their bites are not always fatal, they can cause severe pain, inflammation, and other side effects such as sweating and muscle spasms.
In addition to these venomous varieties, Australia is also home to numerous non-venomous spiders that play crucial ecological roles. The Australian peacock spiders, for example, are known for their vibrant colours and unique courtship displays. These spiders are endemic to Australia and can be found in diverse environments, including the arid interior and the tropical north. Their elaborate rituals involve male peacock spiders extending coloured fans and waving their legs to attract female partners.
Spiders in Australia are also found in urban environments, with some species specifically adapting to city life. White Porch Spiders, for instance, are commonly found living on the outside of houses in parts of Eastern Australia. The presence of spiders in such a wide range of environments highlights their adaptability and the importance of understanding their ecological significance.
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Spiders are distinct from other insects as they have eight legs and bodies divided into two parts
Spiders are arachnids, a class of arthropods that includes scorpions, mites, ticks, and whip scorpions, among others. They are distinct from other insects as they have eight legs and a body divided into two parts, or tagmata. These two tagmata are the prosoma and opisthosoma, also known as the cephalothorax and abdomen.
The prosoma, or cephalothorax, is a fusion of the head and thorax, and is covered by a single, unsegmented carapace. The opisthosoma, or abdomen, is typically segmented and contains organs atypical of an abdomen, such as a heart and respiratory organs. The abdomen is usually divided into a preabdomen and postabdomen. The body plan of spiders, with its two tagmata, is a defining characteristic that sets them apart from other insects, which typically have three body parts.
Spiders have eight jointed legs, each with seven segments: coxa, trochanter, femur, patella, tibia, metatarsus, and tarsus. The tarsus bears claws, which vary in number and size depending on the type of spider. For example, spiders that spin webs typically have three claws, with the middle one being small, while hunting spiders usually have only two. The frontmost pair of legs in some spider species have converted to a sensory function. Additionally, spiders lack antennae or wings, instead using specialised and sensitive setae on their legs to pick up scents, sounds, vibrations, and air currents.
Spiders possess several adaptations that distinguish them from other arachnids as well. They are capable of producing various types of silk, which many species use to build webs for capturing prey. Most spiders also have venom, which they inject through their fangs into prey or defensively when they feel threatened. Male spiders have specialised pedipalps for transferring sperm to females during mating, and many species exhibit a high degree of sexual dimorphism.
In Australia, there are an estimated 10,000 species of spiders, including the highly venomous Sydney funnel-web spider and redback spider. Spiders are commonly encountered in the country, especially in bushland and rural areas outside of cities.
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The CSIRO is actively working on spider-related projects, including research on jumping spiders
Spiders are a common sight in Australia, with an estimated total of 10,000 species, of which only around 3,600 have been described. The CSIRO, Australia's national science agency, is at the forefront of spider research, actively working on projects to enhance our understanding of these arachnids, particularly the jumping spiders (Salticidae).
The CSIRO's projects on jumping spiders involve both contemporary and fossil specimens. The jumping spider family includes approximately 1,200 to 1,500 species in Australia alone, with only 500 possessing scientific names. A recent discovery of a 15-million-year-old jumping spider fossil from the Miocene epoch provided insights into the evolutionary history of this lineage, revealing that it has remained unchanged for millions of years. The fossil's well-preserved state allowed researchers to study its brain structure and the connection between its eyes and brain, contributing to our understanding of spider evolution.
The CSIRO is also engaged in a long-term project on the biogeography of Australian jumping spiders. This project aims to explore the evolution, morphology, ecology, and habitat use of these unique arachnids. By utilizing molecular sequence data and the recently published evolutionary tree of the jumping spider family, the CSIRO can gain insights into the adaptive changes that occurred in response to major shifts in Australian environments.
Additionally, the CSIRO is working on describing the genera and species of jumping spiders, particularly in the widespread genera and the unknown fauna of inland Australia. This project is crucial as jumping spiders exhibit complex behaviors, and understanding them may lead to new insights into evolution. The CSIRO's research on jumping spiders also extends to the study of peacock spiders, a subgroup within the jumping spider family known for their extravagant courtship displays and vibrant colours.
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Frequently asked questions
It is estimated that there are around 10,000 spider species in Australia, with only about 2,700 of them described.
No, only about half of the spiders in Australia are venomous, and most of their venoms are not considered dangerously toxic. However, some spiders, like the Sydney funnel-web spider and the redback spider, are highly venomous and have been linked to human fatalities in the past.
Spiders in Australia are commonly found in homes and buildings, often residing in corners, behind furniture, and in basements. They are also found in bushland and urban areas like gardens and parks.
It is very common to encounter spiders in Australia, especially in certain areas. However, in urban environments, you are less likely to come across them, and most of the spiders you may encounter are tiny and harmless.
