Pachygnatha listeri female from Central Finland. Literally, “pachygnatha” means thick jaws, and you can see why in the second photo. Named after naturalist Martin Lister (1639–1712), P. listeri likes to live in the low vegetation of damp forest areas. #tetragnathidae #spidersky

Black Double-Headed Dwarf Spider (Diplocephalus picinus) from Finland. These 2mm long minibeasts live among leaf litter and munch springtails for snacks. #linyphiidae #spidersky

This Monday’s arachnid is Piratula hygrophila, a wolf spider that “loves water” by name. Indeed, this species thrives in wet and damp ground level habitats. #lycosidae #spidermacro

Viime vuonna päätin uudistaa yleistajuisia matikkaesityksiäni niin, etteivät ne tuntuisi luennolta tai oppitunnilta. Meiju Paxin kanssa käsikirjoitimme show’n ”Harrastajan matematiikka”. Tervetuloa YouTubeen katsomaan aivan uudenlaista tiedeviestintää! youtu.be/RCcvsHULZCw

Yellow-legged wolf spider Pardosa fulvipes. These nimble buggers prefer Eastern Europe: they have never been found west of Germany and Italy. At my summer cottage in Central Finland P. fulvipes are plentiful. #lycosidae #spidermacro

Bathyphantes nigrinus, tiny spider from leaf litter. “Bathys” means deep in Greek, and “phantes” refers to appearing. In a bit of a mystical way since both “phantom” and “fantasy” arise from that word. So Bathyphantes spiders emerge from the deep. #linyphiidae #spidermacro

Orange-legged spider Gongylidium rufipes is a sheet-web weaver from family Linyphiidae. It lives in bushes and undergrowth. G. rufipes is very common in Finland where I live. #spidermacro #linyphiidae #spidersky

Meet Lepthyphantes leprosus, a dwarf spider with a rare preference of living indoors. My wife found this 3mm long minibeast from our kitchen wall in Central Helsinki. #linyphiidae #spidermacro #spidersky

Young male Theridion sp. found next to Acropolis in Athens, Greece. #theridiidae #spidermacro #spidersky

Uloborus plumipes: spider without venom. Usually spiders kill their prey by injecting venom with fangs. But some species wrap an insect with super tangled silk into a tight package and cover it with digestive fluid. After a while the soup is ready. Athens, Greece. #uloboridae

Pretty little jumper from Athens, Greece. Its home base and hunting ground is National Garden right next to the Syntagma square. Species: Evarcha jucunda. #salticidae #spidermacro

Monday spider time! Frontinellina frutetorum from Athens, Greece.

It’s Monday, so it’s spider! Heliophanus kochii, a stunning jumper I found on a public beach in Piraeus, Greece. #jumpingspider #salticidae #spidermacro #spidersky

Still presenting the seemingly endless bounty from my July trip to Rio de Janeiro 🇧🇷 Spiny orb-web weaver Gasteracantha cancriformis. #spidermacro #araneidae #mondayspider #spidersky

Kirjamessuilijat, tulkaahan kuuntelemaan!

Mondays are for #mondayspider Mesabolivar sp., a gorgeous Pholcid spider from Rio de Janeiro, 🇧🇷 #spidermacro #pholcidae #arachoctober #spidersky

Ready for Monday Spider? Here we go: Orb-web weaver of genus Wagneriana from Rio de Janeiro 🇧🇷

Monday Spider time again! Quality cobweb weaver from Rio de Janeiro 🇧🇷: Thwaitesia affinis. There’s amazing biodiversity in the city! #theridiidae #spidermacro

Micrathena sp. female spider from Rio de Janeiro. What an amazing thorny shape! #araneidae #spidermacro #spidersky

Spiders of family Pholcidae have specific eye arrangement: clusters of three eyes on the sides, and two eyes in the middle. Many species, including Carapoia lutea shown here, have really long slender legs. This has earned them the nickname “daddy long legs spiders”. #pholcidae #spidermacro

Free hugs! But beware of spikes. Female Gelanor zonatus from Brazil. Being a member of family Mimetidae, she hunts other spiders for food. #spidersky #mimetidae #rio

Kiertomatriisi ja digikuvien kääntäminen aiheena uudessa matikkavideossani! Matematiikan ihmeitä: Kiertomatriisi youtu.be/Wzlzepodcf0

Striped female spider (Leucauge volupis) from Rio de Janeiro. Amazingly, she manages to wear the colors of Brazilian flag 🇧🇷 AND a tin foil sweater. #spidermacro #tetragnathidae #spider #spidersky

Spiders have eight legs and two extra limbs called pedipalps, located in front. Usually the pedipalps are short. Not so with Gelanor zonatus! This Brazilian male sports palps long enough to win a boxing match against any species with a regular reach. #mimetidae #spidermacro

Pitkästä aikaa aamutuimaan turisemassa tieteestä @jukkahakkinen.bsky.social ja @samulisiltanen.bsky.social mainiossa seurassa :) areena.yle.fi/1-75988084

Noegus sp. jumper from Rio de Janeiro. What captivating eyes! #satlicidae #spidersky #mondayspider

Araneus unanimus from Rio de Janeiro, Brazil. The form is identical to the garden spider Araneus diadematus that you can find everywhere in Europe. But the color is straight out of the flag of Brazil! 🇧🇷 #spidermacro #araneidae #spidersky

Brazilian dark star: female Gasteracantha cancriformis. #spidermacro #araneidae

Most spiders have 8 eyes. But there are some exceptions, like this slender Miagrammopes sp. sporting 4 eyes! I found it in Rio de Janeiro. #uloboridae

Crab spider (Tmarus sp.) from the botanical garden of Rio de Janeiro. #spidermacro #spidersky

Introducing Walckenaeria atrotibialis, a small ground-dwelling spider with orange and black coloration. The back of head is shaped like a saddle, perfect for riding if you were one millimeter tall. Why “atrotibialis”? Note the black tibia segments in the legs. Atrum is black in Latin. #spidersky

Metellina merianae spider belongs to the orb-web weaving family #Tetragnathidae. It lives in caves or other kinds of hollow spaces and requires just the right humidity. #spidermacro

Salticus cingulatus, a singularly stunning variety of zebra jumping spiders. The genus name “Salticus“ comes from the Latin verb “saltare”, meaning both jumping and dancing. So we could actually call them dancing spiders! 🕺 #salticidae #spidermacro #SpiderSky

Cuteness alert! Baby Pseudeuophrys erratica, as adorable as they ever come. #salticidae #jumpingspider

What a green jewel! Tetragnatha pinicola, literally the “four-jawed pine-dweller“, weaves an orb web with a hole in the middle. As a further distinction from regular, Araneidae-type orb weavers, T. pinicola builds its web not vertically but at an angle. #tetragnathidae #spidermacro

Monday Spider. Buongiorno! Greetings from Bologna, Italy. I am here attending a mathematical workshop. As usual, I sample the local arachnids. This jumper lives in Parco della Montagnola. #salticidae #spidermacro

Monday Spider. Oedothorax gibbosus likes to do things a bit differently. While most dwarf spiders hunt with a sheet web, O. gibbosus runs down its prey. This handsome male is about 2mm long. #linyphiidae #SpiderSky

Monday Spider: Tapinocyba insecta, minibeast of boreal forests. This male is less than 2mm in length! Note the sulci, seen as slits between the lateral eyes. That’s where this gentleman oozes sweet perfume for lady-spoods to love. #linyphiidae

Monday Spider: My work place, Kumpula Campus of University of Helsinki, is surrounded by lush vegetation. Inspired by a BioBlitz event I collected some spiders there. Here’s the first report of that catch: Haplodrassus silvestris male. #gnaphosidae

Monday Spider. My number one photography goal: dwarf spider males with weirdly shaped heads. Well, here’s one for you. Diplocephalus cristatus from Helsinki, Finland. #linyphiidae #spidermacro #SpiderSky

Monday Spider. Pseudeuophrys erratica, my favorite Finnish jumper. There are plenty of these guys around my sauna. #jumpingspider #salticidae #spidermacro

Monday Spider. Trochosa terricola, the Earthy Bear Spider. Member of the wolf spider family Lycosidae. Bear or wolf? With eight legs, both at the same time! #lycosidae #spidermacro

Kenttäopas kesän luontoretkille

Monday spider time. Meet Erigone atra, the Steampunk Spider. Spiked sides and shiny helmet make this beast as fearsome as a 2mm long creature can be. #linyphiidae #SpiderSky

Monday Spider. Gnathonarium dentatum is a 2.5mm long predator with a mohawk hairdo. This miniature punk spider can be found in leaf litter in humid open habitats near water. #linyphiidae #spidermacro

I found this handsome orange spider guy in a bush in Protaras, Cyprus. The best guess for species is Nigma flavescens, but the exact truth will remain forever a mystery as I released him after the photo shoot. #spidermacro #dictynidae

Juteltiin vapaudesta Tiedekulmassa - ehkäpä uusistakin vinkkeleistä! Jos meni ohi niin.. eipä mennytkään! youtu.be/nOCWAhMTitE?... @samulisiltanen.bsky.social @anneliljestrom.bsky.social @jukkakhan.bsky.social

Joulutervehdys Kumpulasta! Season’s Greetings from Kumpula Campus! youtu.be/I_r6XlAbMvs?...

Studia Generalia jälleen tänään Tiedekulmassa. Visa Heinonen puhui vapaudesta taloudessa. Plastiikkakirurgi Virve Koljonen pohdiskeli sitä, saako ihminen näyttää siltä miltä haluaa. Komeat taideviittaukset! Maijaliisa Erkkola puhui ravitsemussuosituksista ja syömisen vapaudesta. Upea tiedeilta!

Tänään oli Studia Generalia Jälkikaronkka-porukalla, aiheina mm vapaus avaruudessa ja alkumeressä! Oma otsikkoni:“Vapaus uskoa outoihin teorioihin – tuhoaako tietotulva ihmisen ajattelun?” Mukana mahtavat @anneliljestrom.bsky.social ja @mikaelniku.bsky.social , vetäjänä @samulisiltanen.bsky.social