L. Koch, 1866
L. Koch, 1873
White-tailed spiders are medium-sized spiders native to southern and eastern Australia, and so named because of the whitish tips at the end of their abdomens. Common species are Lampona cylindrata and Lampona murina. Both these species have been introduced to New Zealand.
White-tailed spiders are vagrant hunters who seek out prey rather than spinning a web to capture it. Their preferred prey is other spiders and they are equipped with venom for hunting.
They are reported to bite humans and effects may include local pain, a red mark, local swelling and itchiness; rarely nausea, vomiting, malaise or headache may occur. Ulcers and necrosis have been attributed to the bites, but a scientific study by Isbister and Gray (2003) showed these were caused by something else mostly infections. The study of 130 white-tailed spider bites found no necrotic ulcers or confirmed infections.
Ludwig Carl Christian Koch described Lampona cylindrata in 1866 and Lampona murina in 1873. The genus name comes from the Latin lampo which means shine. The species name cylindrata refers to the cylindric body shape, while murinus means "mouse-gray" in Latin.
The two common species of white-tailed spiders are Lampona cylindrata and Lampona murina. They are similar in appearance; L. cylindrata is slightly larger with females being up to 18 mm long while males are up to 12 mm in body length. The legs span approximately 28 mm in diameter. The two species are not easily distinguished from one another without microscopic examination. They are slender spiders having dark reddish to grey, cigar-shaped body and dark orange-brown banded legs. The grey abdomen has two pairs of faint white spots and—usually but not always—a distinct white spot at the tip just above the spinnerets.
The similarities have led people to think there is only one species of white-tailed spider. It is possible that not all white-tailed species have been identified. The descriptor, white tail, is applied to a variety of species of spiders for which a distal white mark on their abdomen is a distinctive feature; other markings disappear with moultings but the white tail remains to adulthood.
L. cylindrata lay pinkish eggs which are enclosed in a flattened silk capsule and are guarded by the female until they hatch.
Both species are native to Australia. Lampona cylindrata is present across south-east Queensland, New South Wales, Victoria, South Australia, Tasmania and Western Australia while Lampona murina is found in eastern Australia from north-east Queensland to Victoria. The spiders have been introduced in New Zealand with Lampona murina residing in the North Island for over a hundred years while Lampona cylindrata has become widespread throughout the South Island since 1980.
Habitat and behaviour
They live in gardens and inside houses, beneath bark and rocks, in leaf litter and are often found in the folds of clothes, towels and shoes. They do not build webs. According to the Queensland Museum they cannot climb glass. Most active at night, they hunt for other spiders. Their favoured prey is either the black house spider or the closely related brown house spider (Badumna longinquus), both of which are, like the whitetail, native to Australia but have been inadvertently introduced to New Zealand.
Bites to humans
A common perception is that white tail spider bites can be associated with long term skin infections, and in rarer cases progression to necrosis. This is an attribution of infections presenting to medical care with a complaint of "spider bite." Venom has no bacteria and infections do not arise from spider bites. The well described brown recluse bite is direct damage to skin and tissue. It has a limited area and does not spread. All formal studies find no evidence for associations necrosis from white tail spider bites.
White tail spider bites may cause a small red or discolored bump that burns or itches. Something like an insect bite.
A debate continues about the involvement of White-tailed Spider bite in cases of severe ulcerative skin lesions seen in patients diagnosed as probable spider bite victims. Typically, in such cases no direct evidence of spider bite is available. Sensational media reporting of supposed cases of severe "necrotising arachnidism" has given the White-tailed Spider a bad reputation - See more at: http://australianmuseum.net.au/White-tailed-Spider#sthash.5lPlRXUa.dpuf
How does such a myth develop? The issue of necrosis in some bite cases in published studies begins with a paper presented at the International Society on Toxinology World Congress held in Brisbane in 1982. Both white-tailed and the wolf spider were considered as candidates for possibly causing suspected spider bite necrosis in the Australian context. In Brazil the recluse spider was identified as linked to necrosis.
Following this initial report, numerous other cases implicated white-tailed spiders in causing necrotic ulcers. All of these cases lacked a positively identified spider—or even a spider bite in some cases. Additionally, white tailed spiders are generally not found in webs, instead wandering freely about domestic environments. they can be found by anyone who goes looking. with no other identifiable sources for the bite, that lead to community and anecdotal views of an association. Additionally there had not been a case of arachnogenic necrosis reported in the two hundred years of European colonisation before these cases. Of the 130 cases of white tail spider bites studied by Isbister and Gray, more than 60% of the reports the person had been bitten by spiders that had got into clothing, towels or beds.
Clinical toxicologist Geoffrey Isbister studied 130 cases of arachnologist-identified white-tailed spider bites, and found no necrosis or confirmed infections, concluding that such outcomes are very unlikely for a white-tailed spider bite. The major effects from a bite in this study were local pain, a red mark, local swelling and itchiness; rarely systemic effects of nausea, vomiting, malaise or headache occurred. All these symptoms are generally mild and resolve over time.
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