Julien Tchilinguirian

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A very interesting organism, They superficially look quite similar to Trogulidae opiliones

Two balck and white photographs showing the dorsal (back) surface of a fossil in a rock. The fossil is darker than the surrounding rock, and has a body starting with a bit of a point, then a front half, like a spider except a bit suqarer, and a posterior that - unlike a spider - is segmented. It was some legs visible, but much of them is buried in the rock. There is a (4mm, if you're intetested) scale bar on the image.

A black and white reconstruction of this animal in pen, showing if from above, its underside, and in an angled face on view.

For #FossilFriday, meet Plesiosiro. This is a ~315 million year old weird arachnid, found near Birmingham in the UK. It's a lovely fossil but even so figuring out where it sits on the arachnid tree of life has been... annoyingly challenging. Nowadays, we are fairly confident that it...

⚒️🧪🦀🦑 #evosky

1. For the past thirty years I've had the best job in the world.


I've had the opportunity to follow my curiosity; explore the workings of nature and society; mentor students and junior colleagues in the same process; and teach generations of students about it all.

For the finale of our spider ID resources thread, at the hardcore end of the week's spectrum we have 20 'difficult species' accounts for groups where the species are very similar and difficult to distinguish: download from our website at srs.britishspiders.org.uk/portal.php/p... #spiders #arachnids

vue de 3/4 face, on voit ses très grosses chélicères et ses crochets qui s'actionnent verticalement

vue de haut, on voit ses tout petits yeux

vue de face

J'ai mis un peu de temps à traiter les photos, mais début février, j'ai croisé par hasard ce mâle de mygale Atypus sp qui se baladait malgré le froid ! On la trouve nativement sur l'hexagone, et celui-ci faisait autour de 10/12mm de corps.
Le reste du temps, elle reste bien planquée dans son terrier

Maso sundevalli female

Maso sundevalli epigyne

Maso sundevalli.
#Arachnids #Spiders #VC55

NOAA firings hit the birthplace of weather and climate forecasting Dismissed researchers were improving severe weather predictions

It’s dispiriting to see the future leaders of climate research at institutions like GFDL fired indiscriminately (...)

Artificial intelligence cannot compensate for a lack of human intelligence
www.science.org/content/arti...

Heya, I'm an arachnologist: 70% Ethanol is the standard for whole specimens, + a leg in pure ethanol if DNA analysis are planned. I usually put genitalia is a small microvial (0.2 ml) with the specimen.

Microneta viaria male OM System OM-5 OM SYSTEM M.Zuiko Digital ED 90mm f3.5 Macro IS PRO Godox V680-O

Microneta viaria male palp OM System OM-5 OM SYSTEM M.Zuiko Digital ED 90mm f3.5 Macro IS PRO Godox V680-O

Still plenty of Microneta viaria out there in what remains of the leaf litter.

#Arachnids #Spiders #VC55 #UKWildlife #macrophotography #macro #OMSystem

Here we have a male Walckenaeria acuminata just look at it, a common spider but how fasinating is it!

@britishspiders.bsky.social

#spiders #arachnids #walckenaeria

Species of interest - Typhochrestus digitatus. This small linyphiid is mature principally through the winter unlike most other outdoor UK spiders, which mature in late spring or autumn. This reduces competition from other species but prey is likely harder to find. Photo by
@tylanberry.bsky.social
.

Nausicäa of the Valley of the Wind !

Some of the coolest and perhaps most under-appreciated African carnivores are solifuges. The ferocity of these incredible arachnids, a.k.a. camel spiders or sun spiders, easily matches that of the wild dogs and, just like the canines, they can dismember their prey in a matter of seconds.

Do you have any wolf spiders (Lycosidae) collected in the last couple of years? If so, I am looking for specimens from any species and any location *in the world* to add to a genetic study of the family. Let me know if you think you can help!

Observations Wolf Spiders by Julien Tchilinguirian

Salut :) I do not have any H. radiata but with spring I should be able to go out and collect some, I do have any of the specimens listed here in collection : www.inaturalist.org/observations...

(not in pure ethanol but max. 3 years old)

I have various material of Lycosidae from Southern France if also of interest

It's to catch smaller preys

Small lumpy brown mite, with black legs, the 1st pair of which are lined with spines like that of a metal rake

Closer shot of one of the creature's rake legs

The mite, side by side with a tiny pale millipede with bristles at each body segment and a longer bristle tail

*hooded cultists chanting* Rake-legged mite! Rake-legged mite! Rake-legged mite!

Oh and a tiny bristle millipede, all with sand grains for scale. Finally got to find bugs this week. 🤎

Caeculidae are my favorite mite family, I have some I still need to ID ..

a pale, elegant long-legged spider, with whispy silk, under a stone

welcome to the world new spider genus Siskiyu. you've been lurking in the dark, magical woods of far northern California for millenia. Now the humans have finally gotten around to telling your story, at least in part

this research was funded by the NSF

OA here

zookeys.pensoft.net/article/1402...

Whip spider (Paraphrynus laevifrons) covered with chloropid fly puparia. The parasitoid fly attacks the eggs carried by the female. When done, the maggots climb on the "childless" mom's back and pupate. She protects them during this period thanks to her motherly instincts.

A black and white photograph of a fossil scorpion, the front towards the right. Y ou can see mouthparts (chelicerae and pedipalps with pincers), four walking legs, and then a body and tail.

A colour photograph of a fossil scorpion, this time with the top pointing upwards. It also has nice pedipalps and a good body, but the limbs are a bit more scrappy than the other picture. It does have an impressive sting though.

A black and white reconstruction of this super cool fossil species by Jason Dunlop. It's beautifull stippled, and shows the scorpion in dorsal view, with the front upward. It looks a fair bit like a modern scorpion. The man is an amazing artist.

For #FossilFriday may I present to you an amazing scorpion, Pulmonoscorpius kirktonensis. It may look like the moult of a modern species, but these are actually ~330 million year old fossils, dissolved out of a rock from 🏴󠁧󠁢󠁳󠁣󠁴󠁿 using acid.

⚒️🧪🦀🦑 #evosky

[Conférence] « Dans la tête d’une araignée » – Carrefour des Sciences et des arts | Variétés entomologiques LA CONFÉRENCE EN QUELQUES MOTS : Les araignées sont injustement craintes et redoutées. On les imagine solitaires et agressives. Mais qu’en est-il réellement ? Les araignées sont-elles dangereuses pour...

Conférence de Raphaël Jeanson à Cahors « Dans la tête d’une araignée » le 28 janvier 2025

sco.lt/52oZI8

Carrefour des Sciences et des arts

I was really excited to be able to key out this tiny (395 micron) mesostig mite I found in coast redwood leaf litter all the way to species - not an easy task for most mites. Meet Cosmozercon setosus, slide mounted in Hoyer's medium. 🤩

An image of a fossil arachnid shown in doral (left) and ventral (right) view. The photos are black and white and the animal itself looks a bit like a spider, although it isn't. It has a tear drop chaped body covered with dense spines, and an anterior point. It doesn't have the narrowing between the front and the back of the body that spiders do.

A CT scan of the fossil described from the photos - this has a white body and purple limbs, and is rendered on a black background.

A coloured reconstruction of this fossil, which is a dark red all over, with yellow spines.

Word up. It's #FossilFriday. This week, meet Eophrynus. This is a ~315 million year old member of the trigonotarbids - an extinct group, related to spiders, whip spiders, and whip scorpions. Check out the spines! I love this fossil.

⚒️🧪🦀🦑 #evosky

Scorpion folks !!! My people

And In some Theridiid the just emerged male rips up one of its pedipalps to loose some weigh !

1/2 #speciesaday no. 519 is Troxochrus scabriculus. A small, local money spider that I almost always only find on chalky arable fields on the Downs (where it can be quite numerous), using the suction sampler. Although I have had it on amenity grassland in central Brighton too.