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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Difference between haemocoel and coelom

I am really looking for some EMBRYOLOGICAL PERSPECTIVE . I know about coelom derivation but i want to know how haemocoel is derived and how it is fundamentally different from coelom.
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What arthropod is in the picture?

I am from Philippines and I found this in my room. This arthropod has 6 legs and have a bit long Chelicerae like spiders that can fold to hold its food. It's about half an inch long. It also looks ...
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How long might a tick be on a body before biting?

I understand that a tick must be attached for roughly 24+ hours before presenting a danger of transmitting Lyme Disease. However, I am wondering how long a tick might be on my body before actually ...
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What is this strange sea creature we found on the beach?

We found this on a beach in North Devon, UK. I've never seen anything like it. There's a yellowy-ball in the middle with 5 pointed shells attached to it, each of which seems to have a single "leg&...
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Is there any parasitoid that preys on something other than arthropods?

Besides fungi, most parasitoids seem to be arthropods themselves, specifically insects that undergo complete metamorphosis. This makes sense, as feeding on a living body poses different challenges ...
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Arthropod identification request [duplicate]

I'm in Southern Germany and just captured this animal crawling along my wall at considerable speed, apparently hiding from the light. It looks like a entipede from afar (about two dozen legs), and ...
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Absence of cytoplasmic Intermediate Filaments in Arthropods

Cytoplasmic intermediate filaments such as vimentins support the architecture of the cell and have been known to aid signaling processes. However, as in this article, it is stated that out of all ...
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Identify arthropod with many legs in Mumbai

Can someone please identify this ~5 cm long arthropod? I've been finding one of these every 2-3 days inside my apartment ever since rainy season started here in Mumbai (June). The bulb portion is its ...
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Is there any small animal that can jump over a meter high/long?

By small, let's say less than 5 cm body length. I always thought that grasshoppers were the highest absolute jumpers in this class but the highest jump according to this article is 0.7 m...
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What species of spider is this? Could anyone help

This image was taken in assam, India. The size was around 1cm. Could anyone help identify?
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Why do Centipedes always have an odd number of pairs of legs?

Furthermore, centipedes are within the Myriapoda, a subphylum of arthropods which also contains millipedes. Do millipedes also have an odd number pair of legs?
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Is this arthropod non-intrusive and recommended to be left alive?

I am in Portugal (Lisbon) at the moment, and when leaving my room late at night (12 pm ~ 04 am) I usually face about 4 of these arthropods in the corridors: (For reference, the "line" in the image is ...
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Is this statement about caterpillars right?

I've read in lots of sites statements like the following from the Sciencing site "Inside the chrysalis of a butterfly, a caterpillar's body turns to liquid form and it is rebuilt as a butterfly." ...
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Spider identification (Caribbean)

I live in the Caribbean (Puerto Rico) and found this spider in my garage. Is it venomous? It measures about 8 inches as a whole.
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Unidentified Spider

Apologies for the rubbish quality of the image, but I found this spider while in the shower. I’m not exactly sure what species it is and wonder if someone can help me out. I live in southeast ...
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Can anyone identify this mite? [duplicate]

I live in a flat in the UK and have caught such mites a few times on my skin. I think they are responsible for my bites. On one occasion one mite had one dark spot in the middle instead of two. Does ...
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What are these near microscopic white bugs from my comb?

I saw a whole bunch of white bugs crawling on my comb in the medicine cabinet, they didn't photograph well but I did manage to get a bunch of them in mineral oil and eventually take some micrographs. ...
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Evolution of the unique mating system of the scorpion Androctonus australis

Sperm transfer in the scorpion Androctonus australis involves a sclerotized spermatophore, which is formed in the paraxial organs of the male reproductive system. The right paraxial organ produces the ...
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Why does this spider have its third pair of legs raised?

It's hard to tell in this picture, but this Daddy Long Legs spider is sitting with its body and legs flush against the wall with only its third pair of legs raised and resting on its web. Why it is ...
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How do we know how long hermit crabs live in the wild?

This article states that hermit crabs in the wild are extremely difficult to track because they constantly change shells and even gender. Later in the article, they say that hermit crabs can live 4 ...
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Can Chilopoda “vocalize” or produce sound for the express purpose of communication, as opposed to sound as a byproduct of other movements?

Is there any species of Chilopoda that can "vocalize" or or otherwise produce sound for the express purpose of communication, as opposed to sounds it might create as a byproduct of other movements ...
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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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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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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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ID for red millipede swarm near my place

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 ...