Questions tagged [arthropod]

An arthropod is an invertebrate animal having a segmented body, jointed appendages and exoskeleton. Arthropods form the phylum Arthropoda, which includes the chelicerates (horse shoe crabs and arachnids), insects, myriapods, and crustaceans. Use 'entomology' tag if the question is specifically about Insecta.

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is this a brown recluse spider?

What kind of spider is this? SE Michigan, light brown color, second picture less focused but w tape measure for scale. Thank you!
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Any arthropod with non-sprawling limbs?

Are there arthropods with semi-erect or erect limbs? If not, could it be because of interference between more than four limbs or any other constraint?
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what is this bug ? i found it on bed 2 times

What is this 1mm long bug I found on my bed in Egypt? Here is its back photo
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What is (probably) the closest living relative of the trilobite?

The trilobites vanished from the fossil record many millions of years ago, but they were obviously arthropods of some sort. Do we know which animals are their closest living relatives? I've heard both ...
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Tiny white very hard cell bug! Please help to identify!

I found these bugs walking on the floor/ wall and on my laptop. And unfortunately I think they could be in my bed, too, since I bring my laptop to bed sometimes. I live in a big city in the ...
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Identification of Black-Grey Striped Spider (India ,Kolkata)?

I found it on my rooftop . Location : India , Kolkata Season : Summer Morphology : Hairy Legs , with black and grey striped body . Length- 4cm -5cm with legspan Width - 2cm-3cm I couldnt get better ...
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Are These Oyster Crabs?

I found these crabs at the end of September, 2018. My family was vacationing on the coast of Lopez Island in the Pacific Ocean off of Washington State. I have been trying to figure out what they are ...
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Were there any terrestrial species in the ancestry of all crustaceans?

To the exception of woodlice, Crustaceans live in aquatic (marine or freshwater) environments. Crustaceans are arthropods which is an immensely diverse taxon. Many arthropods live in terrestrial ...
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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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Is a female spider, well-fed by sexual cannibalism, less likely to mate again?

The Wikipedia page on sexual cannibalism (e.g. female spiders eating their mates) currently has a statement that sounds wrong to me, but I don't feel expert enough to edit it out: An additional ...
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Do we know how dangerous six-eyed sand spiders are?

The Sicariidae family contains the well-known and dangerous Loxosceles spp. (fiddle-backs, violin spiders). The family's other two genera, Sicarius and Hexophthalma (six-eyed sand spiders) have ...
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Why is this spider wound in such a dense web?

I saw this thing yesterday on my window curtain, and I've been wondering what this is. It looks like a dense network of spider web, and the spider inside it is visible. I thought the spider was dead, ...
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Can Anyone Identify this Tissue?

I am hoping someone can identify the image below My wife felt a bug bite her and found this in her hair now she's worried that it was a tick. the photo is at 40X under microscope. I'm guessing it's ...
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Looking to identify this species

I found a rather strange invertebrate...something... outside my home this evening, and I have no idea what it might be. It looks kind of like a small brown lobster, without the claws. I think it has 8 ...
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What arthropod is this?

Location: Johannesburg, South Africa Colour: Brown/Grey Legs: 6 or 7 pairs Size: ~10mm I've been finding these guys in my bath tub the past two mornings. I've caught and released them. I'd like to ...
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Identify this larvae that lives on a musrhoom?

I was in the forest near the Rhone river in France and I uncovered some mildewy wood bracket fughi (Ganoderma) on a fallen willow tree. It was a scene from a sci-fi film. some arthropod larvae of 2-...
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Costa Rican Centipede Species

What species of centipede is this? Found it 3 miles from San Ramón, Costa Rica
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Can anyone identify this garden orb weaver spider?

Found in low foliage in Harare Zimbabwe. Argiope flavipalpis or A.levi
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What kind of spider is this and is it poisonous?

A brown furry diamond shape on its back and brown joints all on black body. Caught entering my house in Trinidad (small island off South America) -- killed the first one, this is the second.
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Are any arthropods poisonous to the touch?

I'm particularly interested in whether any insects are poisonous to the touch. Note that toxic-bristled caterpillars are actually venomous, since in all species I'm familiar with, the bristles ...
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Did insects and arachnids diverge before or after moving to land?

Question: Are arachnids and insects so distantly related that they were already diverging before their (independent) emergence(s) on land? I am curious to know what the fossil record and molecular ...
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Identification of Unknown Insects found in landfill (spider like)

Could someone help me to identify the following spider-like insects? They are very small, so I used a macro lens to capture them. I have tried to capture them as clearly as possible. They are about ...
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What kind of Brazilian Arthropoda is this?

It looks like a Diplopoda, but I've never seen anything like that. A friend took those pictures in the Brazilian Cerrado (Goiás state, Brazil) these days (October, start of rainfall in Spring). It was ...
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Can someone identify this spider?

Saw this on the street in the UK. To my eyes it looked and moved distinctly tarantula-y (although I don't have any firsthand experience with them) which I'm pretty sure we don't have any of natively. ...
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How not to kill a spider while moving out of my flat?

About two weeks ago, when it started getting cold, a house spider (tegenaria domestica I believe) has chosen my flat for spending the winter. I like those spiders so it's not a problem for me. Only ...
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Which species of centipede is this and is it dangerous to cats?

My cat was "playing" (aka torturing) with this centipede: I tried to measure its length with a measurement tape: Since I know some species of centipede can be poisonous, I tried to find if ...
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What species is this orange and black caterpillar from Costa Rica?

Does anyone know what type of caterpillar this is? I don't know much about them. Pictured it in January in Costa Rica cloudforest (Monteverde) and am using it in a speech for visiting Costa Rica. ...
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Why are spiders afraid of flies caught in their web?

I recently noticed a fly got caught in a spider web in my house. The fly was very energetic and, even though caught, continued to flap it's one wing (which I think might have been partially free) with ...
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Swarming red millipedes found near my home

Location:Hyderabad,South India. These worms usually come out when it rains,these worms are the most common ones any help in figuring out them,they come in groups too.
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Do ants really find the shortest path to a food source?

There exist many computational intelligence algorithms based on the observation that ants deposit pheromones in such a way that they find the shortest path to food sources. This logic is used to ...
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Identifying a spider from coastal Virginia

A spider recently put up a web in my room in coastal Virginia, USA (on the left in the photo). Rounder/taller body than most species I've seen. Dark brown, not quite solid-color coloration. If laying ...
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Identifying this spider

I think this is a spider. 8 legs, 2 body sections, and 2 really long Palos? Anyways, can anyone identify this bug, or point me to a resource where I could classify it?
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Name and Behaviour of Arthropods near a Cactus

Background Story I have a small, old cactus on my sunny, south-facing window sill in southern Germany. Since a few years, small black dots gathered around its pot. At first, I thought the dots were ...
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What is this insect in this picture? [duplicate]

I recently found this insect near our veranda wall. What insect is this ? Is it poisonous? As you can see, it has multiple legs fine as hair, but it is not like a common millipede or centipede. I ...
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What are these (eggs?) ? ( Location - India )

The picture can be zoomed in on clicking Description: There are 24 of them, each ovoid, 1mm long and attached to the switch's frame by suction cups connected by tubes. They are secured to the base ...
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Identification of bug - California

A friend found this bug, what is it? Diamond Bar-ish, California.
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Identification of an insect found near Shirdi, Maharashtra

I found the insect nside house near Shirdi, Maharashtra. I have captured the image
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Taxonomy: Categorising Collembola [closed]

Observe: In some rows (Order, Family), the third column reveals a discerning physical characteristic or body type (...
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Terrarium Compatibility: Millipedes with Carnivorous Plants?

I have a child that loves his large millipedes (Desert Millipedes) and Venus Fly Traps. He's also been wanting to get some Sundew Savages. Given this little collection and his real enjoyment of ...
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How do spiders get silk from their spinnerettes?

I'm 13 and writing a report on spiders. How do they use the silk protein gel from the spinnerets? How does it get from the spinnerets to the web? P.S. I know how silk is created, all the way up until ...
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How do legs of tiny insects/spiders like mosquito/Opiliones work?

I think I understand how legs of humans work. We have bones to which muscles are attached. Muscles can only contract / relax. By the combination of many different muscles we can make complex movements:...
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Is this a saltwater millipede?

I spotted this millipede-like creature in Hervey Bay, Australia at low tide, just kind of hanging out at the bottom of a small saltwater tidepool. It's several inches long, composed of a large ...
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What insect is this?

I found it in Russia. Where do they usually live? What do they eat? Full length is approximately 2 cm.