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Contrary to popular reports, not every spider in a UK household is a False Widow. Indeed, out of the vast amount of arachnids I have been asked to identify only a very small proportion have been confirmed to belong to the genus Steatoda and even fewer as the Noble False Widow, S.nobilis. Unfortunately a lot of these spiders are being killed due to these cases of mistaken identity (not that you need to be killing S.nobilisDriver Fines Stop D c Licenses Unpaid The For Suspending Should 's nIzTqHz either). So here I am going to present a guide on identifying a few UK spiders in the hope of cutting down these instances, I will show you what to look for in a spider to either hopefully identify it as a False Widow or eliminate it from suspicion.

First, however, a few brief disclaimers.

If What Citizen Ask Fairfield You 't Juuling Know Don Is Kids It Your 1: There are over 650 species of spider in the UK (of which a dozen are reported to have bitten humans). Obviously we cannot represent even a significant fraction of this number here. What we will be featuring in this article will be ‘the usual suspects’; the spiders that most frequently come up in pictures I am asked to identify. This should allow you to visually identify 80% of the S.nobilis look-alikes you come across in the UK. The list is not exhaustive, however, and you may still come across the occasional oddity.

2: Arachnid markings can vary wildly, depending on the age and sex of the specimen and even upon location. Bear in mind that spiders periodically shed their skin as they grow and as time passes markings may become duller, losing the vivid colours they might have when freshly moulted – this may also cause some confusion. To accommodate this, I will be presenting alternative methods based upon physical characteristics, not just markings.

3. Spiders are broadly defined by genus (Araneus, Amaurobius, Tegenaria, Steatoda etc.) Within these, there can be a number of different species, (or sp.) So if you see XXX .sp that means it can be any species from within that genus. Sometimes there are just a few and sometimes many more – Theridion has over 600! This can also make identification difficult, but I shall endeavour to present enough information to make an educated and informed identification.
4: If you poke your fingers into webs and crevices then you run the risk of being bitten. Spiders are remarkably tolerant and shy creatures that normally run at the slightest disturbance, but they will sometimes bite if given no other recourse. However, no spider will bite you for just looking at it so fear not about viewing them, or taking photos.

I will be using scientific terminology throughout to describe various elements of a spider’s anatomy, as illustrated in the diagram below.

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So without further ado let me present a few of these usual suspects. None of these are False Widows and are not in the family Steatoda.

sp. featuring Know If Ask Juuling It Don 't Is Fairfield Your You Kids Citizen What Zygiella .x-notata, The Missing Sector Orb Weaver

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Photo taken and kindly supplied by Jenni Louise Cox

Most commonly it is the Missing Sector Orb Weaver, Zygiella x-notata, that is misidentified and ends up paying the ultimate price. In truth, these are easy to distinguish from False Widows before you even see the spider! No false widow will ever spin an orb web – the big, pretty, two-dimensional webs commonly seen. A Steatoda web is messy and in a corner, usually with the spider hiding out of sight in a tubular retreat, waiting for prey to get caught in the web. Missing Sector Orb Weaver spiders spin vertical 2-dimensional circular webs that often miss a section (hence the name) giving them a somewhat unfinished look.

Zygiella frequently gets mistaken for Steatoda as it shares the large bulbous abdomen and longer front legs of that genus and has pale markings that can superficially seem similar to Steatoda nobilis. However, the rest of the abdomen colouration is frequently lighter than Steatoda and the glossy, almost silvery abdomen lacks the pale anterior band characteristic of the Noble False Widow, having vertical dark stripes instead. The forelegs are also shorter than Steatoda’s; close but no cigar. This species makes up the majority of the spiders I am tasked to identify. It’s utterly harmless and it is a real shame to see so many of this attractive spider killed through ignorance.

2. Amaurobius sp. featuring Amaurobius similis, The Lace Web spider

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Amaurobius pictures usually tend to be either A.similis  or A.fenestralis. They are normally misidentified as False Widows as they share a pale, marking on their abdomen and inhabit similar environs to Steatoda. However, upon closer inspection there are several differences – don’t worry, you won’t have to get too close!

The abdomen, whilst similar in markings, is a totally different shape to Steatoda, being more oval (even in a plump female) than the False Widow’s. It is also more matte or maybe satin than the False Widow’s shiny gloss finish. The legs are slightly thicker and it doesn’t have the four dimples on top of the abdomen that characterize Steatoda. An inspection of the patterning on the abdomen will reveal it to be different to S.nobilis, more yellowy-cream than the silver-white of the Noble False Widow. Nonetheless, Amaurobius is the second most frequently misidentified spider and I have seen all too many that have been killed based upon False (Widow) assumption.

3. Araneus sp. featuring Araneus diadematus, The Common Garden Spider

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The classic Garden Spider pose: Photo taken and kindly supplied by Jenni Louise Cox

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A female specimen awaiting prey. Photo taken and kindly supplied by Jenni Louise Cox

You’d think it unlikely that Araneus could be mistaken for It Your Kids Don Juuling Is Citizen You Fairfield What 't Ask Know If Steatoda,but nonetheless this is the third most frequent suspect for misidentification as a False Widow. Again, simply by looking at the spider’s habitat you should be able to discount it from being Don Is Juuling Your Ask Kids Citizen Know You It If Fairfield 't What Steatoda. Typically found in large, beautiful orb webs (as opposed to Steatoda’s messy web), particularly in September and October, Araneus have somewhat hairy or  ‘spiky’ striped legs that are more or less the same length – completely unlike Juuling Ask Your What Know Fairfield Don If Kids 't Is Citizen You It Steatoda. The abdomen shape is also often completely different, having a more triangular shape tapered towards the bottom where the spinnerets are housed, particularly in the case of Araneus diadematus, our common Garden Spider. They also have a fantastic amount of variation in patterning and colouring. The abdomen can be anything from a light brown to black with the distinctive ‘cross’ shape varying from white to silver and sometimes gold. Truly, they are a beautiful native species that can be seen all over the country. Unfortunately they are still often mistaken for False Widows as they have a habit of wandering about between spinning webs – they will usually spin a different one every night! Again, they really do not look anything like Steadoda upon closer inspection and I am surprised so many pop up in ID requests. It is probably due to their general abundance, particularly at this time of year. Incidentally I have been bitten by one of these spiders at the tender age of about 12 when I picked one up and held it too tightly in my fist. Aside from the initial pain of the bite – no more than a pinprick – there were no effects.

4. Tegenaria sp. featuring Tegenaria domestica, the Common House spider

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Tegenaria domestica, the one you see scurrying across the kitchen floor, is also inclined to get stuck in baths. Tegenaria domestica; © 2004 by M. Betley (creative commons)

Tegenaria is the one that most people will see running about late at night. Favouring the warmth, they move into our houses this time of year and are one of our most active species. They probably only occur in ID requests due to this frequency of being seen. Usually if you see one out and about it is a male looking for a mate, so pity him and leave him alone. A male spider’s life is hard enough as it is, he doesn’t need you making it any harder (or flatter!) One of the main things that should discount Tegenaria from suspicion of being a False Widow straight away should be they are usually just too big! One of our biggest species, they can easily reach three or four inches (or feet if the general arachnophobe’s estimate is used!) Add to this the general ‘legginess’ and proportionally small abdomen and you should have no issues with thinking this is a Steatoda family member. Even a big female’s abdomen would be small in comparison to her legs and their markings are quite different, almost dappled tan and dark brown stripes. Prone to bolting if disturbed, a glass and piece of card is your best bet, as with all spiders.

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5. Segestria sp. featuring Segestria senoculata, the Snake Backed Spider

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Photo taken and kindly supplied by Jenni Louise Cox

Don Citizen You Is Know Ask Your If What Fairfield It 't Kids Juuling Segestriadoesn’t crop up all that often, most likely because it is a somewhat reclusive spider. The genus is known largely as the Tube Web spider, from its tendency  to hide in tubular retreats in walls. It is one of the larger species in the UK and rather impressive-looking, with large mouth parts (or chelicerae) which in the case of S.florentina are an iridescent green! On the whole Segestria doesn’t really resemble Steatoda; the abdomen is somewhat elongated and the patterning is different.  In the case of S.senoculata the pattern resembles that of an Adder, which gives it its common name. In most Segestria, however, the patterning is a noticeably darker.

That said, it is not entirely outside the realms of possibility that someone could mistake this for a Steatoda of some description, especially if they encountered a gravid female, and it is for this reason that I have included the genus here. Segestria has been known to deliver a painful but otherwise harmless bite to humans, and should in no way be regarded as dangerous.

6: Nuctenea sp. featuring Nuctenea umbratica, the Walnut Orb Weaver Spider. 

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Photo taken and kindly supplied by Jenni Louise Cox

Similar to Araneus – indeed, until reclassified it was to be found in that genus – The Walnut Orb Spider has a vaguely triangular dark brown body and is found on large circular webs. It lacks the cross of A.diadematus but otherwise resembles a duller example of that specimen. One noticeable difference is that it is flatter in profile, allowing it to secrete itself in crevices whilst it waits for unsuspecting prey to blunder into its web. Indeed, umbratica means ‘living in the shadows’ in Latin. Some examples do have slightly lighter patterning and it is another species that could be mistaken for Steatoda. However, apart from sharing the four depressions on the abdomen they share little resemblance.

7: Theridion sp. featuring Theridion sisyphium, the ‘Mother Care’ spider

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Theridion Sp. likely T.sisyphium. Photo taken and kindly supplied by Jenni Louise Cox

No, despite its common name, T.sisyphium was not named after a large chain of stores selling baby products; rather  for its characteristic of tending to its young after they are born and feeding the hatchlings -not a common behaviour for true spiders. Sadly I have never seen one amongst the many arachnids I have been asked to ID, but I am including it as it does bear some resemblance to S.nobilis. T.sisyphium is, in my humble opinion, another example of a quite beautiful UK species.

With striking markings, this small species belongs to the aforementioned Theridion genus, which contains over 600 known species. this in turn is part of the family Theridiidae (over 2,200 species) which also contains the Lactrodectus and Steatoda genera – the Widow and False Widow spiders of recent interest. As you might expect, it does share many characteristics with these genera, round abdomen and lengthened forelegs amongst them. It is, however, much more heavily patterned than Steatoda nobilis, with a wonderful marbling and mottled colouration varying from tans and creams to white. Should you be lucky enough to see one, please don’t kill it, enjoy it and know that I am somewhat jealous!


So after all these innocent bystanders, let’s get to the real thing – the False Widow. I will feature the three main Steatoda species commonly found in the UK, culminating with S.nobilis itself.

S.bipunctata – The Rabbit Hutch spider

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Photo taken and kindly supplied by Jenni Louise Cox

More than any other False Widow spider, S.bipunctata resembles the infamous Black Widow. She is dark brown, bulbous in abdomen, and generally uniform in colour, although light variants with a very small pale dorsal line exist. As with all Steatoda there are four giveaway dimples on top of a very smooth and round abdomen. The legs are longer at the front and these are rather small measuring no more than 3cm or so. Despite their resemblance to Black Widows, S.bipunctata are harmless by comparison.

S.grossa. – The False Widow Spider or cupboard spider

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Mature Male Steatoda grossa: Photo: Creative Commons License :Algirdas, 2005, Lithuania. Note that this is a male specimen, evidenced by the slighter build and enlarged pedipalps.

S.grossa looks a little like S.nobilis and has a similar bite, akin to a nasty bee sting that some may react adversely to. It has fewer markings than its close relation S.nobilis, normally looking like a series of arrows on the abdomen, and the distinctive anterior abdominal band. Want a bit of trivia? A painted S.grossaBiometric Considers To Moves Passports Barbados xpX0Sqx was used in Sam Rami’s Spiderman film as the spider that bit Peter Parker (note: neither the author nor the editor wish to imply that spider bites may bestow superpowers. Unfortunately.)

S.nobilis – The Noble False Widow.

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Steatoda nobilis. Photo taken and used with kind permission of Brenda Averly

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Another example of Steatoda nobilis, this time with decreased markings. Note, still, the elongated front legs and pale band round the front of the abdomen. Even though trapped under a glass, the spider is not reacting. Photo kindly supplied by Lauren Whitely. Well done for trapping and not killing it!

Which brings us to the beastie that everyone was so worked up about in the first place, the Noble False Widow spider. S.nobilis are small, averaging 2-3cm, with smooth-looking legs that are noticeably longer at the front. They generally have a large bulbous abdomen with a pale band round the front and a marking on the top that can variously resemble a skull, a trident, or other patterns dependent upon individual. Once you know what you are looking for, they are very distinctive and easy to spot. They are fairly clumsy when off their web and will retreat from any disturbance.

Males are generally more diminutive, with proportionally smaller abdomens and, if mature, enlarged pedipalps. Even once you have positively identified S.nobilis, there is no need to kill it. A glass and card can be used to safely remove the spider, should you be so inclined, or you can just leave it be and let it continue providing you a service by eating flies and other disease-carrying insects. S.nobilis will not bite unless provoked (like being caught against skin in clothing) even then the bite should be no worse than a nasty bee sting. I’ll say it again one more time and this time paraphrase the great Douglas Adams in my description. DON’T PANIC – MOSTLY HARMLESS. Ignore the nonsense the papers are spouting. S.nobilis has never killed anyone, nor has it eaten any flesh. They have been here for 140 years and are not a new species in the slightest. I have written multiple articles and even made5 span Video Speech Campus org Free 2018 Jan C qwxU7WAAt0.

Hopefully this guide will stop people assuming every spider they see is a Steatoda. We are blessed with a great number of spider species in the UK, each of which forms a vital part of our ecosystem. Without our eight-legged friends we would be overrun with disease-carrying insects and in a far worse state all round. So the next time you see a spider, don’t be alarmed. If you need to remove it, do so using the tried and tested glass and card method and deposit it outside. Spiders are phenomenally adaptive and resourceful creatures and really do not deserve the levels of fear and danger which they have accrued. I will, in time be producing one final article in which I will discuss ways for people to try to overcome their fear of spiders, which is often irrational and based upon misunderstanding and misinformation, though often through no fault of their own. Until then, happy spider spotting! 

Allen Ward is an experienced keeper and breeder of arachnids, sharing his home with more than 300 spiders and tarantulas from all over the world – many of which have medically significant venom. He also has a large collection of various invertebrates and reptiles. The only times he has ever been bitten by spiders was when he was a child and was in the habit of just picking them up in the wild for a better look. He is still in possession of all of his limbs. He is available to advise on all relevant stories until the False Widow drama has died down – please contact the Elwell Press for details.


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