My concern about my declining Parasteatoda population led me to check on the juvenile stock. They’re fine. They’re looking good. They look to be about 50:50 male:female, too, and the males are flaunting huge pedipalps, so maybe I should think about breeding them soon, even though they look so small compared to the big adults currently in the breeding cages. Here’s a quick look at the teenagers.
Found this in my lab. Concerned that someone might be walking around right now with an alien implanted in their gut.
Somebody is going to have an exciting Thanksgiving dinner!
Another sad discovery in the lab: another spider, Gilly, has died suspiciously of an exploded abdomen. This has only been happening since I started feeding them waxworms and mealworms, so I suspect gluttony might be the culprit.
Strangely, this has only been happening to my Parasteatoda, while the two species of Steatoda are doing just fine. My colony is currently dominated by Steatoda triangulosa, which is unexpected, since they were relatively rare in our collection sites. I do have about 20 or so juvenile Parasteatoda growing up in smaller containers, though, so the pendulum may swing back in a few weeks when they get promoted to the big breeding cages.
Meanwhile, here’s the latest juvenile (Steatoda triangulosa, of course) that is ready for breeding, I think. The picture catches her at a good angle so you can see both the zig-zag brown stripe down the side of her abdomen, and the sawtooth or triangle pattern you can see dorsally.
You can sort of see a white-flocked Christmas tree on her abdomen, maybe. (NO, IT’S TOO SOON FOR CHRISTMAS REFERENCES!).
There are still a few spiders hanging around outside. This one was adjacent to the house, where Mary found her hiding under some leaves.
She was cheating, though, because she was living under the dryer vent where it periodically warms up.
Winter is a tough time to be an arachnophile, especially in the Great White North. It’s even tougher to be a spider. They’re mostly gone from outdoors — I’ve been looking, and everything is frozen and windy, the bugs are all dead, and it’s no place for an arachnid.
They do have some places to thrive, though: in your house. We people at least provide refugia for a few species, like the theridiidids I’ve been following. My wife, who has the eyes of an eagle, found this tiny little guy in our kitchen and scooped him up. He’s a juvenile so it’s hard to tell, but the palps look swollen and he’ll probably be ready to mate after his next molt.
The photo isn’t the best. A) he’s very smol, b) I’m shooting through plastic, c) he’s dangling on a single slender thread spanning the tube, and is practically vibrating, and d) he’s very excited because I fed him a fly, and he’s fangs-deep in that juicy fresh beast.
He’s Parasteatoda, and has a spectacularly stark pattern of angular pigments on his abdomen (not adequately shown). Once he has settled down and is nestled in a comfortable web — it takes a few days for them to build a cozy nest — I’ll have to get some better shots.
At least when people ask where spiders go in the winter, I have an answer. They go to my house.
I’m buried in paperwork today and have scarcely had time to do anything with the spider colony today, but I did make my usual scan through the adult cages for new egg sacs (nothing today — they’re still all lurking, full of insect goo), and looked through the juveniles to see who I needed to promote to a larger container. Here’s one with a beautiful complex pattern of mottling on her abdomen, so I grabbed a photo just prior to moving. She’s not appreciative of being shuttled around and disturbed, so she’s in her standard “leave me alone” pose.
That’s Parasteatoda, by the way. Beautiful plumage! Lovely plumage! She’s just restin’, really she is.
Now for something totally different. I’m gearing up for a project in which I track the developmental progression of pigmentation in juvenile spiders, and along the way, also map out variation in that pigment. Analyzing all that will require a fair amount of data; I’ll have to do a daily collection of pigmentation images for a single cohort of spiders, and organize those for analysis. I have a poor idea of how much time that will take, so I did a speedrun this morning. I lined up 6 containers of juvenile spiders (all S. triangulosa from the same clutch, plus one S. borealis of roughly the same age), and racked them up for fast photography. I gave myself 30 seconds per spider to get a photo series, which turned out to be easily done, the fastest part of the whole process.
Then I took all the images and made a focus stack, which took a while but since it was all automated was fairly painless. Then I rotated all the images to the same orientation, anterior upwards. First glitch: some of the spiders were annoying and presented a side view to me, rather than the dorsal view I wanted. I went with it anyways; the only way to get them to oblige is to catch them in repose in the appropriate position, so that’s going to take a couple of trials to get right. Next, everything was scaled to the same size.
Data collection: a few minutes. Processing the images: over an hour. I think I’ll be able to automate some of the processing, though, which ought to simplify and speed it up. The end result is a series of standardized images of 6 spiders in which I can see the dorsal pigmentation fairly well, although two of them were not compliant about lying in an optimal position.
Today was a feeding day, and since I’m trying to include some variety in their diet, I gave the spiders mealworms. Nice plump mealworms, conveniently placed directly in their webs.
They all turned up their noses, or what passes for noses, at them. They didn’t exhibit the slightest interest, which was disappointing after their spectacular voraciousness when fed waxworms last week. I don’t know whether it’s that they’re still full, or they just don’t like mealworms, or they’re just being obstreperous. I told them, “If you don’t eat yer meat, you can’t have any pudding. How can you have any pudding if you don’t eat yer meat?” and even that left them cold and uncaring.
So no pudding today, ladies.
All right. One spider is nibbling on the delicious meal I prepared. Gilly gets pudding!
The pudding being served today is Jellied Beetle Grub Guts. I hear it’s very popular in England.
Some people mentioned I should try focus stacking on my spiders, so I fumbled around and found some inexpensive software to do it, and gave it a shot. Here are a couple of trial runs (including some spiders I photographed in a single plane yesterday.
I’m just going to say…nice. Also easy. I always take multiple shots anyway, so I just do what I always do, maybe being a little more careful about centering each shot as identically as I can, and then dumping 4-8 photos into the software. I especially like how the juvenile in the third image turned out, letting me see individual hairs on the legs while not compromising the sharpness of the abdominal pigment pattern.
A few words about how I’m doing this: this is my Spider Studio.
It’s nothing fancy, as you can see. I’ve got a Canon body and a speedlite; I’m using my lovely Tokina macro 100mm lens, with a couple of tube extenders for extra magnification, and there’s also a big white diffuser there. I’ve got a bright LED panel to the left and back, and a simple clamp light with a full spectrum light on a jointed arm.
There are some colored papers on the bench top that I can use for backgrounds, but they don’t matter much with the big adults, who are usually hunkered down in a corner of their cardboard frame. The camera is stationary on a tripod, and I’m doing everything manually, focusing by holding the spider’s container in one hand and moving it back and forth, while in the other hand I’m holding a remote trigger and clicking away madly. The juveniles are contained in these clear plastic boxes, about 5cm square — I just pop off the lid, and there’s plenty of light from all around to illuminate the animal.
Hey, if handheld focus stacking is good enough for Thomas Shahan, it’s good enough for me. I was worried that I was going to need a fancy optical bench and something that would allow me to do precisely calibrated advancement of the camera focus, but nah, it turns out to be far easier than I feared.
I was also concerned because I’d seen all these finicky tutorials about using Photoshop or some other software to prep and align each frame, which was going to be tedious. Nope, don’t need that either: I found a program called Focus Stacker that does automatic alignment and assembles all the images into a single sharp result. It’s totally mindless, which I need: shoot a bunch of images with changing focus, drop them into Focus Stacker, and a few minutes later it presents you with the stacked image. I’m going to do this with all my spider photos from now on!
The spider colony wasn’t very lively today. Everyone is still bloated from that waxworm feast last week, and even when I threw flies right into their webs they wouldn’t move — they just sat there, at best they might waddle a bit and desultorily wave a claw at such mundane fare. They now expect more. I promised them mealworms for tomorrow, but no, this is not enough, they have acquired a taste for larger prey.
“Bring us man-flesh,” they whispered.
I countered by telling them that in their current state, they weren’t going to be able to run down a baby, let alone a college freshman. They waddled towards me and hissed, which wasn’t too scary. They look like barrage balloons with a couple of feebly waving legs underneath. Like this:
Look at that! She’s not in a state to scamper at all. She’s huge.
Also pretty. Parasteatoda has these mottled rings of pigment in shades of black and brown, not at all flashy, but subtle and elegant. With abdomens so distended, they’re easy to admire, too. (by the way, the white circle top right is scrap from a hole punch, so you can estimate the size.)
They’re also marvelously variable. Here’s another Parasteatoda with an abdomen that looks like it was made up as an abstract mosaic. If you stare at it long enough you’ll see patterns. I’ve got my eyes open for one with Jesus’s face.
Right now I’ve got a bunch of full-grown adult females that are mostly immobilized by their gluttony, and then a largeish collection of juveniles in the incubator. I’m hoping to upgrade some of them to the larger cages soon — probably over Christmas break — and then I’ve got to introduce males to these young virgins. The Parasteatoda babies really are babies, tiny little spiderlings, that will take a little longer. Meanwhile, the next generation of Steatotoda triangulosa are coming along.
I’ve also got a few S. borealis, but I’m not sure I want to expand their numbers, since the Parasteatoda and S. triangulosa ought to be enough to keep me busy. On the other hand, S. borealis is so goth, with their blackish-purple bodies and gray racing stripes.
They also grow to a larger size. I may have to keep a few around looking badass.
