I woke up at 3am with a sharp pain in my hand. I blearily brushed my face with the hand and felt something soft on my neck. I pinched it in my fingers, turned on the light, and found a spider. Not the best way to wake up. It's probably nothing, the mark is very small, I have localised redness around it and it stings a little bit, but I thought to try and look it up and the body doesn't look like any of the pictures put with reported bites listed on this page. The spider itself is around 15mm long from the fangs to the abdomen, and I took a couple of pictures of the body, so I'm including one with this post which shows a distinctive pattern on its back. It would put my mind at ease if someone could identify it, and it would be awesome if it is a new reported bite, assuming my hand doesn't drop off by morning (although, in all likeliness, I've probably just failed to recognise it with one of the pictures).
It's a Segestria and I think it's Segestria florentina. Yes, they are known to bite occasionally in what they see as self defence i.e. if they feel trapped. It was probably living in a hole in the wall of your house before it decided to go walkabout. Maybe it's a male looking for a female to mate with and accidentally wandered inside. If you've got a picture from the front it should be possible to determine its sex.
Thanks guys, I'd just come back from Tunisia and was worried something travelled back with me, but this coupled with the redness and pain almost completely subsiding puts my mind at ease. I think I crushed the front in the darkness, but I have an image of the front nevertheless. What am I looking for to determine sex, in case the image isn't clear?
I may be wrong, but I think this is in fact Segestria senoculata, due to the colour of the abdomen. It has those markings you can see on specimens of this species. As far as I remember, Segestria florentina is overall much darker, and its abdomen is uniformely brown, without those markings.
I almost wrote senoculata but changed my mind. If you look at pictures of senoculata you'll see they've all got banded legs, not black legs. Also in senoculata the blobs on the centrall dorsal pattern are less swept back than in florentina. So, I'm sticking with florentina (at 90% confidence limits), probably a young one or a male.