@samulisiltanen.bsky.social
Matemaatikko, hämähäkkimies, luontokuvaaja, basisti ja voimailija.
Me neither!
27.10.2025 15:47 — 👍 1 🔁 0 💬 0 📌 0
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!
25.10.2025 08:59 — 👍 4 🔁 1 💬 0 📌 0
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
27.08.2025 07:23 — 👍 11 🔁 1 💬 1 📌 0
Noegus sp. jumper from Rio de Janeiro. What captivating eyes! #satlicidae #spidersky #mondayspider
25.08.2025 05:52 — 👍 8 🔁 0 💬 2 📌 1
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
Done! 😊
11.08.2025 09:41 — 👍 0 🔁 0 💬 0 📌 0
Brazilian dark star: female Gasteracantha cancriformis.
#spidermacro #araneidae
That I do not know. Probably the difference is not all that drastic as in the families containing the four-eyed species the eyesight is pretty poor even with eight eyes.
Some underground-dwelling spiders have lost all their eyes, which is more straightforward to understand.
It’s very rare. Out of over 53000 spider species known to science, just about 100 have four eyes. Genera Tetrablemma, Nopsides, Notnops and Miagrammopes are examples; I could not find others.
10.08.2025 20:26 — 👍 2 🔁 0 💬 1 📌 0
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
06.08.2025 06:30 — 👍 5 🔁 0 💬 1 📌 0
Crab spider (Tmarus sp.) from the botanical garden of Rio de Janeiro. #spidermacro #spidersky
28.07.2025 10:40 — 👍 5 🔁 0 💬 0 📌 0
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
16.06.2025 05:38 — 👍 4 🔁 0 💬 0 📌 0
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
26.05.2025 04:47 — 👍 1 🔁 0 💬 0 📌 0
