Questions tagged [arachnology]

Arachnology is the scientific study of spiders and related animals such as scorpions, pseudoscorpions, harvestmen, collectively called arachnids. It can include the study of ticks and mites which is sometimes also called acarology.

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1answer
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Hundreds of Red Spiders in Individual Webs

I live in the USA in south Louisiana. I woke up this morning to find my yard covered in hundreds of spider webs. Each of those little white puffs is a spider web. Inside of each web is one little red ...
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Are these spider eggs?

I was pulling weeds in my backyard in Southern California, when I saw a spider over a white area on the underside of one of the leaves. It's staying right near the white spot. Are those spider eggs? ...
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Why is funnel web spider venom so lethal to humans and not so much for other mammals?

According to the information from this article, People and other primates are exquisitely sensitive to funnel web venom but, intriguingly, other mammals such as mice, rabbits, guineapigs, dogs and ...
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Species Identification: Red velvety insect, India

What species is this? Description: Location: India These insects came out just after overnight rain. They were all over the place. Their body looks like velvet. Are these insects poisonous?
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Identify fuzzy black quarter sized spider with orange on abdomen, in Minnesota

Found this spider on my car in Minnesota near St Paul (USA). Total size including the legs (end of rear leg to end of front leg in picture) is probably about the size of a quarter.
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Can spider silk be synthesized to be used for 3D printing?

With the recent rise in 3D printing, I keep hearing about more novel ways to use the technology: cell 3D printing, liquid aluminum or plastic 3D printing. For example, this Ted talk deals with ...
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What kind of spider is this?

I spotted this spider in my garden (Northern UK). The body is about 20mm long, and it's made a sizeable (50cm) web on a wall. There's another semi-identical one on a nearby hedge. What kind is it?
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What is this bug?

I recorded a video of this bug: https://youtu.be/0eoWfHLEo7A I counted 8 legs, the front legs are a little curved. The drawing on the flat back is dark and looks like the image of Jesus with some ...
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Spider identification

This red spider has set up a web in my yard, in South Eastern, Texas, United States: The spider itself is about an inch long (2.5 cm), and is predominantly red to brown in color, with red legs, and a ...
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UK - What type of spider is this?

Location: East Anglia, UK. Approximate size (including legs at full span; like in the image): about 3cm.
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Spider Identification Illinois

I noticed a really huge, beautiful web on my porch last week, and tonight, I discovered its resident. I'm thinking it's an Araneus diadematus (Cross Orbweaver), but I was hoping for some confirmation. ...
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What biological constraints are there on how large a spider can grow?

Spiders fascinate me, but what intrigues me the most is just how big some spiders can get, which leads me to my question. What biological constraints (if any) would limit how large a spider could grow,...
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How does a spider's legs not get caught in silk when wrapping prey?

When a spider catches a prey, it wraps it up in silk. It uses its legs to do this. So how does its own legs not get stuck on the silk? Note: I'm not talking about walking around the web. There are ...
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Identification of this spider?

I find these in forests in Oregon, western half, though they're probably on the eastern half as well. They live under pieces of wood and bark, and have a small web across the ground. Mine will eat ...
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Do trap door spiders have 10 legs?

I was reading this National Geographic article, 50 New Spiders Discovered In Australia when I became confused by the two trapdoor spider species photographed. I looked up trapdoor spiders and looking ...
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Did I just watch a spider die?

So I'm sitting in my office and all of a sudden a small spider is gliding down on a web string from the ceiling, right in front of my eyes, and down onto my desk. It proceeds to make a few awkward ...
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Toronto spider identification

I found it in Toronto, Ontario, during early June, 2015. When prodded it seemed to jump around, or at least to move very fast. I can also post a short video of it if needed.
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Is Batesian mimicry more important for females?

Myrmarachne plataleoides is a jumping spider that mimics the Kerengga or weaver ant (Oecophylla smaragdina) in both morphology and behaviour. However, the two sexes appear different: Myrmarachne ...
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Evolution of spider webs?

Web making seems like a fairly complex behavior built from a pretty strong material. So how exactly did it evolve? Do we have any clues about what kind of features/behaviors preceded web making and ...
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How many species of mites live on the human body?

How many known species of mites regularly live on the human body? I've always heard that most people have eyebrow mites. This source mentions 2 species of face mites, Demodex folliculorum and D. ...
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What kind of spider is this (reddish spider)?

I just saw this spider on my door and was wondering what kind of spider this is. information Country: The Netherlands (Europe) Color: quite reddish (maybe an idea why this one is reddish?) pictures
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Bug Identification: Tiny Bugs

I have seen these on my hands recently and I am wondering what they are. Urban Setting. South Central Pennsylvania.
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What is this weird spider?

Today while we're cleaning our storage room I saw this strange looking spider and I'm not even sure if this is a spider, it has two claws folding inward to its mouth and two long weird limbs, it is ...
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Black spider identification

Location is in Canada / Ottawa I did a web search, but I can't figure out what species it is.
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What species is this fast-moving spider?

This is a frame from a recent recording: Location Forest in Central Europe at around 1pm. Abiotic factors at the time of recording Temperature = 23°C Humidity = 38% Wind = 6 km/h Description ...
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What is this spider I found in Idaho?

I live in Moscow, Idaho and saw this guy early in the morning last week. It was about quarter sized if I recall. I've never seen one before and was in a hurry so I couldn't get a better picture, sorry....
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What is this spider hunting in the tree in the night?

I took the following picture of this spider in northern Switzerland (alt: ~700m) with macro flash/lense. The picture was taken during the night in a cedar tree (Thuja occidentalis).
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What is this arachnid?

I came across a photo on Wikipedia depicting an Oreocereus celsianus with what looks to me like some kind of harvestman on it. The photo was taken at the San Francisco Botanical Garden. Can anyone ...
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What spider is that in south of Brazil?

I'd like to know if it is possible to identify the spider in the photo below. In fact, as shown in the next picture, it is very small. Location: South of Brazil.
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4answers
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How did this spider evolve to mimic exactly a human face and arms?

So I came across something terribly amazing today, that is, a video showing this species of peacock-spider, that literally, transforms into a human face waving his arms about. What could have ...
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2answers
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Help me identify this spider from my garden

Found this in my garden today in Sydney, Australia (specifically Lane Cove). Can you tell me what it is?
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What species is this large-ish spider?

Last night I came across this spider outside my house (costal Southern California). It was bigger than any I'd seen before, about 2.5 or maybe 3 inch legspan, maybe just under an inch for the body ...
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1answer
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Species Identification: Spider

I usually would search for myself, but I need to be super sure about the identification because I need to know if I need to get an exterminator in here or not. (I think it might be a giant house ...
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3answers
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What is this spider spinning a bright green web?

Here is the picture of it I took with my phone while I was out working: Here is a close up: Location: Texas (winter).
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What is the identity of this spider from India?

I came across this strange guy today at my classroom in Tamil Nadu, India. It is a spider which is not very much bigger than an ant but with an artistic body. He has 8 legs, but the two on the front ...
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2answers
174 views

Which spider is this? Is it dangerous?

So today while clearing the trash out of my room I found this orange spider on an abandoned piece of foam. It is carrying a weird ball with it wherever it goes. What is this? And to which genus does ...
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1answer
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What kind of spider is this and is it dangerous?

Found this spider on my couch the other day in Steubenville, Ohio. The spider is about 1 - 1.5'' (2.5 - 4 cm) long. The spider looks brownish in the image, but tends to a pale yellow color in reality.
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551 views

What is this spider, and what is this object that emerged from its rear end?

I was observing this spider (caught in a Petri dish) under my microscope, when I noticed that a small, round object emerged from its rear end. It appeared to be black and white in appearance. I am ...
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394 views

Identify this Harvestman

I spotted this guy in Switzerland. It's clearly an Opilione (Harvestman), but I really know nearly enough about this diverse group to be able to identify the species. Sorry, I didn't think to place ...
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Can dead scorpions still sting?

I found a dead scorpion on the sidewalk today, and brought it home, being careful not to touch its stinger. Bees can sting even after they are dead, if you step on them in such a way that it pushes ...
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How much energy does a spider expend per day just waiting for its web to vibrate?

Roughly speaking, a small, complex electronic circuit or IC might sit in "sleep mode" using a current of roughly 1 µA (e.g. 1, 2), thereby using roughly $3\times 10^{-6}$ Watts, and that ...
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What kind of mite is this?

I found this (mite?) on my head skin close to hair. Is it a common dust mite or something else? Photographs under a simple microscope (10x objective) are below. Size is in the order of tenths of mm. ...
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Spider Identification Michigan

This was taken in Ann Arbor, MI. It looks a bit different from the wolf and grass spiders I'm used to seeing. Anyone know what this might be? edit: Per request, I've uploaded a better picture. ...
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1answer
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What is the name of this red and blue striped spider (?) - Brazil, Rio de Janeiro

Anyone knows the name of this thing? I found it in our bathroom. It is maybe 10-15 mm. It looks like a spider but the colors left me puzzled
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Can somebody identify this species of spider?

I ran into this cool looking spider in my yard in Banjaluka, Bosnia and Herzegovina. It's about the size of a fingernail and unusually shaped (spherical). Could it be poisonous?
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1answer
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What are these tiny, swarming, jumping bugs?

I built a small plywood box in my yard (on Long Island, NY, USA) for some stray cats about a year ago. I didn't bother waterproofing the box, and so over time the box has gotten damp. About two weeks ...
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1answer
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What kind of spider is this from Sydney, Australia?

I was cleaning the pool when this guy crawled on my foot. I hit him away and noticed a bite mark. I managed to snap a photo of him. I went to the doctor because I was worried it was a funnel web and ...
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1answer
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What kind of spider is this?(Rajasthan, India)

Hi there, I found this insect in India/Rajasthan. Is this a spider or scorpion? It was nearly 50 mm in length.
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Identify this spider from Bangladesh

Location: Jahangirnagar university, Savar, Bangladesh EDIT: Here is the video from which image is taken
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Will salting the ground kill insects and spiders?

I want to kill the insects and spiders living in my egress using something non-toxic to humans, dogs. I was thinking copious amounts of salt would kill earth dwelling bugs and what appears to be ...