Scytodes thoracica

Spitting Spider
Scytodes thoracica

This handsome little spider is, literally, a spitting spider. Their silk glands are located next to the venom glands in their head (well, the cephalothorax), instead of the abdomen, like many more common spiders. They don’t spin webs at all, preferring to stalk their prey at night. Once they’ve gotten close enough, about a centimeter or so, they spray a line of venomous liquid silk from their fangs, snaring the prey. And then they eat it.

This is the first spitting spider I’ve ever seen. I pulled out a bowl for some cereal, and lo and behold, there was a spider with these really neat markings in it. Nature is everywhere, even the cupboard. It’s a very small spider: this photo was taken at 2:1. I used the Canon EF 100mm f/2.8 Macro USM lens on extension tubes, lit with a 430EX II. The flash was shot through a 43″ umbrella mounted on a lightstand; ordinarily I would say that’s an impractical setup for macro, but the spider wasn’t going anywhere and I had the whole thing set up in the living room already, except for the lens. Post-shoot wrap-up consisted of tossing the spider outside and getting a new bowl for the cereal.

It was a pretty straightforward animal to ID. The distinctive markings would have made it easy if I had known about this species, but I didn’t and so purposefully ignored them: the spider was small enough to be a juvenile of one of the more common kinds I see around the house, and color patterns are really variable in many spiders. Judging by the large cephalothorax (the front section, with the legs), I didn’t expect it to be a weaver. The eyes jumped out at me though, definitely not a jumping spider. There are six: a pair of median eyes in the center, and a pair of lateral eyes high on each side of the median eyes, partially hidden in the dark bands. So I turned to BugGuide’s guide to spider eye arrangements, got momentarily concerned because of the resemblance to the recluse spiders, and then found the species immediately when I checked the Scytodidae. There’s only one genus and a few species, and as it turns out, the markings for S. thoracica actually do look pretty useful for identification.