Samuli Siltanen
@samulisiltanen.bsky.social
Matemaatikko, hämähäkkimies, luontokuvaaja, basisti ja voimailija.
February 16, 2026 at 6:19 AM
Cyclosa mulmeinensis, the spider inspired by camels.🐫
No, just kidding! Orb-web weavers existed much before camels. So it must be the camels who borrowed from C. mulmeinensis the cool idea of sporting two humps in the back.
#spidermacro #araneidae #cyclosa
No, just kidding! Orb-web weavers existed much before camels. So it must be the camels who borrowed from C. mulmeinensis the cool idea of sporting two humps in the back.
#spidermacro #araneidae #cyclosa
February 9, 2026 at 6:16 AM
Cyclosa mulmeinensis, the spider inspired by camels.🐫
No, just kidding! Orb-web weavers existed much before camels. So it must be the camels who borrowed from C. mulmeinensis the cool idea of sporting two humps in the back.
#spidermacro #araneidae #cyclosa
No, just kidding! Orb-web weavers existed much before camels. So it must be the camels who borrowed from C. mulmeinensis the cool idea of sporting two humps in the back.
#spidermacro #araneidae #cyclosa
Quality crab spider from Okinawa, Japan. I found this elegant green eight-legged pickle in a park in Naha. Species is Oxytate hoshizuna. #thomisidae #spidermacro
February 2, 2026 at 12:37 AM
Quality crab spider from Okinawa, Japan. I found this elegant green eight-legged pickle in a park in Naha. Species is Oxytate hoshizuna. #thomisidae #spidermacro
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
January 26, 2026 at 12:34 AM
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
January 18, 2026 at 11:08 PM
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
January 12, 2026 at 7:00 AM
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
Meiju Paxin kanssa käsikirjoitimme show’n ”Harrastajan matematiikka”.
Tervetuloa YouTubeen katsomaan aivan uudenlaista tiedeviestintää!
youtu.be/RCcvsHULZCw
Harrastajan matematiikka
YouTube video by Samun tiedekanava
youtu.be
January 10, 2026 at 9:48 AM
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
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
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
January 5, 2026 at 7:20 AM
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
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
“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
December 29, 2025 at 9:13 AM
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
“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
December 15, 2025 at 5:56 AM
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
December 8, 2025 at 6:09 AM
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
December 1, 2025 at 6:58 AM
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
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
November 24, 2025 at 6:09 AM
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
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
Species: Evarcha jucunda.
#salticidae #spidermacro
November 17, 2025 at 12:31 PM
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
Species: Evarcha jucunda.
#salticidae #spidermacro
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