Samuli Siltanen
@samulisiltanen.bsky.social
Matemaatikko, hämähäkkimies, luontokuvaaja, basisti ja voimailija.
Monday spider time! Frontinellina frutetorum from Athens, Greece.
November 10, 2025 at 12:39 PM
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
Heliophanus kochii, a stunning jumper I found on a public beach in Piraeus, Greece.
#jumpingspider #salticidae #spidermacro #spidersky
November 3, 2025 at 6:28 AM
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
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
Spiny orb-web weaver Gasteracantha cancriformis.
#spidermacro #araneidae #mondayspider #spidersky
October 27, 2025 at 8:21 AM
Still presenting the seemingly endless bounty from my July trip to Rio de Janeiro 🇧🇷
Spiny orb-web weaver Gasteracantha cancriformis.
#spidermacro #araneidae #mondayspider #spidersky
Spiny orb-web weaver Gasteracantha cancriformis.
#spidermacro #araneidae #mondayspider #spidersky
Kirjamessuilijat, tulkaahan kuuntelemaan!
October 25, 2025 at 8:59 AM
Kirjamessuilijat, tulkaahan kuuntelemaan!
Mondays are for #mondayspider
Mesabolivar sp., a gorgeous Pholcid spider from Rio de Janeiro, 🇧🇷
#spidermacro #pholcidae #arachoctober #spidersky
Mesabolivar sp., a gorgeous Pholcid spider from Rio de Janeiro, 🇧🇷
#spidermacro #pholcidae #arachoctober #spidersky
October 20, 2025 at 5:50 AM
Mondays are for #mondayspider
Mesabolivar sp., a gorgeous Pholcid spider from Rio de Janeiro, 🇧🇷
#spidermacro #pholcidae #arachoctober #spidersky
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 🇧🇷
Orb-web weaver of genus Wagneriana from Rio de Janeiro 🇧🇷
October 13, 2025 at 8:27 AM
Ready for Monday Spider? Here we go:
Orb-web weaver of genus Wagneriana from Rio de Janeiro 🇧🇷
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
Quality cobweb weaver from Rio de Janeiro 🇧🇷: Thwaitesia affinis. There’s amazing biodiversity in the city!
#theridiidae #spidermacro
October 6, 2025 at 5:15 AM
Monday Spider time again!
Quality cobweb weaver from Rio de Janeiro 🇧🇷: Thwaitesia affinis. There’s amazing biodiversity in the city!
#theridiidae #spidermacro
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
#araneidae #spidermacro #spidersky
September 29, 2025 at 5:29 AM
Micrathena sp. female spider from Rio de Janeiro. What an amazing thorny shape!
#araneidae #spidermacro #spidersky
#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
Many species, including Carapoia lutea shown here, have really long slender legs. This has earned them the nickname “daddy long legs spiders”.
#pholcidae #spidermacro
September 22, 2025 at 5:00 AM
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
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
Female Gelanor zonatus from Brazil. Being a member of family Mimetidae, she hunts other spiders for food.
#spidersky #mimetidae #rio
September 15, 2025 at 5:09 AM
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
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
Matematiikan ihmeitä: Kiertomatriisi
youtu.be/Wzlzepodcf0
Matematiikan ihmeitä: Kiertomatriisi
YouTube video by Samun tiedekanava
youtu.be
September 12, 2025 at 4:38 PM
Kiertomatriisi ja digikuvien kääntäminen aiheena uudessa matikkavideossani!
Matematiikan ihmeitä: Kiertomatriisi
youtu.be/Wzlzepodcf0
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
Amazingly, she manages to wear the colors of Brazilian flag 🇧🇷 AND a tin foil sweater.
#spidermacro #tetragnathidae #spider #spidersky
September 8, 2025 at 4:52 AM
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
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
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
September 1, 2025 at 5:37 AM
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
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
Reposted by Samuli Siltanen
Pitkästä aikaa aamutuimaan turisemassa tieteestä @jukkahakkinen.bsky.social ja @samulisiltanen.bsky.social mainiossa seurassa :) areena.yle.fi/1-75988084
August 27, 2025 at 7:23 AM
Pitkästä aikaa aamutuimaan turisemassa tieteestä @jukkahakkinen.bsky.social ja @samulisiltanen.bsky.social mainiossa seurassa :) areena.yle.fi/1-75988084
August 25, 2025 at 5:52 AM
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
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
August 18, 2025 at 5:45 AM
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
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
August 11, 2025 at 5:42 AM
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
August 6, 2025 at 6:30 AM
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
July 28, 2025 at 10:40 AM
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
Why “atrotibialis”? Note the black tibia segments in the legs. Atrum is black in Latin.
#spidersky
July 21, 2025 at 8:39 AM
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
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
#spidermacro
July 14, 2025 at 5:48 AM
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
#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
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
July 7, 2025 at 6:56 AM
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
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
Baby Pseudeuophrys erratica, as adorable as they ever come. #salticidae #jumpingspider
June 30, 2025 at 6:51 AM
Cuteness alert!
Baby Pseudeuophrys erratica, as adorable as they ever come. #salticidae #jumpingspider
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
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
June 23, 2025 at 7:24 AM
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
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
June 16, 2025 at 5:38 AM
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