
Male Tetragnatha montana in defensive pose (Photo by Gail Hampshire via https://www.flickr.com/photos/gails_pictures/6056350532)
Dear Readers, on Sunday 20 of us had a great walk in Coldfall Wood with Ed Milner, spider expert and all-round naturalist par excellence. There were lots of small children on the walk, who were all delighted to be looking in leaf litter for tiny invertebrates, and a lot of the adults were fellow nature-nerds too, so it was a lot of fun. However, by the end of it I had an aching back/legs/feet, so it was good to get back and collapse for a bit.
One of the spiders that we saw was a long-jawed orbweb spider(Tetragnatha), like the chap in the photo above. These arachnids are not uncommon, and you often see them close to water – the one that we saw was on the edge of the wet woodland, and when we had a night walk a few years ago, nearly every fence post had a little web and one of these so-called ‘stretch spiders’ keeping watch. The spiders have an attractive silvery sheen, and when disturbed they adopt the posture above, with their legs stretched out – this is very effective camouflage, as the creatures look more like a piece of grass or a twig than a spider.

Tetragnatha extensa (female) Photo by By James Lindsey at Ecology of Commanster, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=1669831
Long-jawed spiders spin simple, delicate webs, with a ‘hole’ in the centre, and quite widely spaced radii and spirals. Being near water, they catch all kinds of mosquitoes and midges which should make those of us who are prone to being bitten by such creatures very happy.

Tetragnatha extensa on web (Photo By James Lindsey at Ecology of Commanster, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=1669832)
The male spider that we found on the walk today was off looking for a female spider – males can be identified by those ‘boxing gloves’ at the front, known as pedipalps, and used to transfer sperm into the female. The female lays her eggs in this egg sac, underneath a leaf – note how it’s disguised to look like a bird dropping, or something mouldy.

Egg Sac from Tetragnatha sp (Photo by By Phil – Egg sac from TetragnathaUploaded by Jacopo Werther, CC BY 2.0, https://commons.wikimedia.org/w/index.php?curid=25419878)
There are six species of Tetragnatha in the UK, but worldwide there are some 320 species, indicating what an adaptable spider this is. Everything about it appears elongated and delicate, and maybe this is why it so often goes unnoticed. But if you have a pond or stream or lake nearby, I bet you could see some long-jawed spiders, especially as it starts to get dark and the spiders move onto their webs. Let me know if you’ve ever noticed one!


















































