Friday, September 09, 2011

Spiders' Guardian angel!

Sometimes it can be difficult to back up an argument about spiders.
At this time of year, when 'Legs and Co' (and I'm not talking about a 1970's edition of Top of the Pops) are scuttling around your carpets like it's the mini-beast equivalent of Strictly Come Dancing, the last thing an arachnophobic homeowner wants to hear is 'spiders are your friends'.
Ironically, on this clump of constantly morphing data we are brazen enough to call 'The Web', generally, the most likely statements, comments and 'facts' about a fascinating and useful animal are either 'it looks better on the sole of my shoe', or 'eeeeugggh kill it!'
I recently blogged about the ever-predictable presence of the British house spider (Tegenaria species).
It's autumn, so male spiders must search for a mate. There's a little book they read in their tunnel webs (passed from generation to generation), it teaches them (1) never to leave their hidey hole until at least late August, (2) Try not to get stuck in a bath. (3) Favour finding Mrs Spider over finding something to eat. (4) Be on TOTAL alert for predators. (5) Learn to detect ANY movement - it's a threat unless it's a female. (6) Always head back indoors. (7) Last resort is to bite.
It's a book specifically written for a seven-legged animal. I know spiders have eight legs, but most of them read it on the loo before going out on the pull and need a free leg to wipe their spinnerets!
Yep - that's pretty contrived, but most of our arguments for killing spiders are too.
House spiders are an inevitable visitor in autumn and they are, as I say every year, completely harmless. If you are frightened, try not to squish them. Plonk 'em outside if you must - they just want to scour your skirting board for a female friend. Most will die after mating through the shear exhaustion of wandering around for weeks.
It always astounds me that one of Britain's more impressive arthropods is vilified with such resounding hatred from all corners.
The Guardian's John Moore recently bigged up team Tegenaria with this sensible scribe in prose only I can dream of constructing!


Making the point that children have a natural, un-deterred urge to touch spiders through their general explorative intrigue, the article quotes Stuart Hine, of the Natural History Museum and suggests our fear of these animals is more 'nurture than nature'. Mummy and Daddy will say "NO - don't touch that!" instilling fear through association.
My 19-month-old niece recently pulled her grandfather in the direction of a magazine on a table, while making a spider-like scuttling motion with her hand. When he looked at the photo she was pointing at the spider-like green stalk head on a tomato. So it's clear that even at that age, there is an association between the eerie scuttling motion and the spider shape.
I just hope my sister (a total arachnophobe) doesn't besmirch spiders to such a degree that my niece becomes another squisher!

Spiderham (nothing to do with Homer Simpson's Spider Pig)

A quick note. My boss recently recalled a childhood memory of a spider scuttling away from a kitchen worktop, carrying a piece of meat. He seemed pretty sure he saw it happen!
I was a little sceptical about this, as most arachnids subdue live insect prey with either a neurotoxin (paralyses by shutting down nervous system) or an agatoxin (paralyses by shutting down muscular mechanisms).
They tend to use this technique as an alternative to having a fridge! They leave prey wrapped up in silk in suspended animation, but still alive with insect blood hydraulically coursing through their exoskeleton.
Then, when they fancy a snack they return to the web and use a digestive enzyme to biodegrade the contents of said insect, which can then be sucked up by the spider.
I didn't imagine for one minute that a spider would be interested in cooked or processed mammalian meat, but on a tedious search of the web, I found similar accounts and observations by other folk.
The general consensus on this seemingly unlikely scenario is that spiders possibly have a 'taste' sense and are aware of organic materials which may attract insects like flies and ants and wasps, so occasionally, when the opportunity arises, they will carry our mealtime detritus to their web as bait for their own mealtime!
Stay webwise folks.
Gav.




Friday, August 26, 2011

Autumn - Tegenaria tastic


OK - it's begun. The eight-legged dash.
Perhaps it's early, but it's inevitable. The UK's most common biggies have ventured out to look for a mate.
Tegenaria Duellica, Domestica and Atrica are on the loose!
Perfectly normal for the UK (if a little early).
Spotted these two males (I actually think they are both Duellica - one's a juvenile) tonight on top of my oven and trapped them before releasing them outside!
These are what we Brits call 'house spiders', yet it's only now, at the start of autumn that we notice them in our homes!
Fat pedipalps (club like appendages) - males.

Friday, June 17, 2011

Some of this story doesn't have legs


Our bastion of 'quality' news, the British Broadcasting Corporation flails
wildly in poorly researched directions with what is actually quite an attractive story here.

US workers in Kent wisely spotted and trapped a female black widow spider (Latrodectus) at Chatham Docks, which had legged it into Blighty on cars imported from the States.
The amorous alien (she was carrying hundreds of spiteful spiderlings in her sac) was handed to a Maidstone vet in a takeaway carton.

It's not unheard of. Black widows have, in recent history, made it into the UK on US-imported goods.
They're not generally as dangerous as the reputation that proceeds them, but I would doubt most UK A&E departments have the anti venom to slake the pain should one pinch a pasty Brit!

* Note to 'Mr Rowland, of the Trinity Vet Centre', Latrodectus species don't weave funnel-shaped webs. They are tangle web spiders which spin clever individual strand lines to ensnare unsuspecting prey!

* Note to the BBC - Black widow spiders are one of the most 'Venomous', not 'Poisonous' species in the world. Both male and female of the species are venomous!

Click photo-link for full story.

Friday, June 03, 2011

Mind my web... will ya!.... tut

Multiple news sources report a study about spiders (Orb Weavers in Oz) suggesting that our eight legged pals get so irritated by unwanted web intrusions that they repair unwanted web damage with warning crosses to highlight the fact there's a web!

LINK FROM TIMES OF INDIA

Friday, May 06, 2011

Awww, look at her dimples!


I received an email from an arachnipedia visitor called Tony in West Yorkshire, Birstall, to be exact, asking for identification of the spider you see here.
It's not a spider I've ever seen in the flesh, but I know it's a Steatoda Bipunctata - distant relative of the Australian Red Back and the fearsome Black Widow. The distinctive dual dimples in a large abdomen confirm to me this is a female!
But it's also a relative of many Steatoda or (false widow) spiders in the UK.
The Bipunctata tends to lurk in and favour animal compounds/habitats (it doesn't eat animals - it eats the flies) hence its nickname, 'The Rabbit Hutch Spider'.
It's a harmless spider, but, one capable of a nip which may sting a bit!
Stay webwise!
The Natural History Museum has a detailed description of Steatoda species HERE

Monday, April 11, 2011

A spider in the bath....

Looking at old kids' TV shows I might now remember what sparked my interest!

Gorgeous little film.

VIDEO

Eight legs, but they still hitch a lift


Australia's real biggie, the huntsman spider, is known for causing minor prangs on motorways as it drops down from behind sun visors in cars, startling drivers and passengers alike.
Modern legend has it that spiders are feared more in Australia for this scenario than for their venom these days.
Breakfast Radio presenter Belinda King, of Hobart, Tasmania's 936 ABC Radio interviewed Dr Robert Raven, Head of Terrestrial Biodiversity at Queensland Museum, today and asked just why Huntsman spiders like to take a ride.
Click HERE to visit the site and hear the broadcast.

And a quick 'Ko'- nod to the Japanese

My boss drew my attention to this today. CLICK HERE

I must admit, If I had the cash.....

Friday, March 11, 2011

We're too 'hard-on' spiders


I'd read, some time ago, that the toxins in the venom of Brazilian wandering spiders were, let's say a bit off-kilter.

The wandering spider is perhaps the fruit-seller's nightmare. It's that most-feared arachnid that is always willing to boldly go where no other spider has gone before. It clings to banana plants and has been found in the UK many times in fruit imports.
But usually it's spotted scratting at the celophane from the inside IF it makes it alive onto our shop shelves (which is very rare).

But it could help us live long and prosper.

You see, aside from the dreadful neurotoxins and other arachni-nastiness the wandering spider (the world's only commonly fatal eight-legged beast) this lump of legs has a trick up its weave.

How can I put this in a tasteful way?

There's a condition called Priapism. The permanent engorgement of blood in the penis or clitoris. It can be fatal.
The wandering spider's venom 'puts lead in your pencil' basically!
I'd read this years ago, but felt a bit icky about it!

Anyway, seems science bods are now trying to create some synthetic 'Viagra' from spider venom.

Sounds great, as long as I don't find myself getting my eight legs over!

Stay webwise folks!

http://www.straitstimes.com/BreakingNews/TechandScience/Story/STIStory_644012.html