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@amypteride.bsky.socialOct 11, 2026, 9:01 AM

What time is it? It’s #Cheliceratime & #Arachtober !
And here are the drawings of the second week of #Spideroctober, with a quick sheet for each species after the 2 main pages!

Next update for the drawing challenge next sunday!

#spider #sciart

@amypteride.bsky.socialOct 9, 2026, 3:31 PM

And to end today's topic, the usual drawing auto-feedback and refs!

Thank you for reading & I’ll see you on the next #Cheliceratime!

4/4

Is this paleoart accurate ? The pose was inspired by the fossil itself, I’m not that much at ease when drawing pedipalpids so I played it safe. The first pair of legs isn’t preserved, so these ones are based on current mastigoproctines’ proportions. The pedipalps’ spines follow what’s been observed on the holotype. Missing details (like the eyes) are reconstructed based on other mastigoproctines.REFERENCES · Clouse R.M., Branstetter M.G., Buenavente P., Crowley L.M., Czekanski‐Moir J., General D.E.M., Giribet G., Harvey M.S., Janies D.A., Mohagan A.B., Mohagan D.P., Sharma P.P. & Wheeler W.C., 2017. First global molecular phylogeny and biogeographical analysis of two arachnid orders (Schizomida and Uropygi) supports a tropical Pangean origin and mid‐Cretaceous diversification. Journal of Biogeography 44, p. 2660–2672. • Dunlop J.A. & Penney D., 2012. Fossil Arachnids. Monograph Series Vol.2, Siri Scientific Press. 192 pp. · Pinheiro F.L., Kellner A.W.A., Da Silva J.A., Duque R.D.C., Sayão J.M., Araújo E.V., Costa F.R., Buchmann R., Cerqueira G.M., Canejo L., Beccari V., Bantim R.A.M., Holgado B. & Pêgas R.V, 2025. Cretaceous Pterosaurs of the Araripe Basin: A Comprehensive Taxonomic Update and Paleobiological Insights. Anais da Academia Brasileira de Ciências 90(1), 70 pp. • Santana W., Pinheiro A., Silva T.A., Lima D., 2024. Description of a new fossil Thelyphonida (Arachnida, Uropygi) and further record of Cratosolpuga wunderlichi Selden, in Selden and Shear, 1996 (Arachnida, Solifugae) from Crato Formation (Aptian/Albian), Araripe Basin, Brazil. PeerJ 12, e16670, 20 pp. The ICS international chronostratigraphic chart 2025. Episodes 2025. Online at https://stratigraphy.org/chart Colorado Plateau Geosystems Inc., 2026. Global Series. In DeepTimeMaps. Online at https://deeptimemaps.com/map-lists-thumbnails/global-series/ Dunlop J. A., Penney D. & Jekel D. 2023. A summary list of fossil spiders and their relatives. In World Spider Catalog. Natural History Museum Bern, online at http://wsc.nmbe.ch, version 23.5.
@amypteride.bsky.socialOct 9, 2026, 3:31 PM

But, before starting, there's something I'd like to say on the Crato Formation's fossils for #Fossilfriday.

#Cheliceratime
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Today's species comes from the Crato Formation, a Brazilian geological formation from which incredible fossils have historically been stoled from Brazilian people by European countries & plunderers. There are many other similar situations like this across the world, paleontology's history is plagued by colonialism & neo-colonialism, but the Crato Formation is one of the more accessible and documented cases to talk about right now. Crato’s fossils are often seized by customs, and several specimens have been at the center of juridic fights with European museums refusing to give fossils back to local communities & scientists, infantilising them and going against basic human dignity and respect for heritage. Paleontologists have a role to play in all of this, and more & more people act to ensure locals have a central part in all of this. Mark my freaking word: FOSSILS & COOL ROCKS WILL NEVER BE WORTH MORE THAN RESPECTING OTHERS. Science helps us to understand the world, and to do so we always make choices on what we talk about or what we decide to test. Choices affecting others, choices showing how we view human interactions. Political choices. Science has always been political, and it's up to all of us to make it better and not continue to fund human suffering. And I frankly don't give a sh*t if you disagree. Human lives, basic rights & dignity aren't up to debate. And I'll include something like that in future posts each time it's needed.
@amypteride.bsky.socialOct 9, 2026, 3:30 PM

What time is it? It’s #Cheliceratime, #Fossilfriday & #Arachtober !
For this triple occasion, we're talking today about a cretaceous vinegaroon!

All the basic infos are here but if you want to learn more, there’s more in the thread below!⬇️🧵

#cretaceous #paleoart #arachnid #sciart #bugsky
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This vinegarroon is one of the few named species of this order from the entire Mesozoic era. It already looks quite modern in every details, and shares a lot of features with the current vinegarrons living in the Americas. Size : 12-ish cm of body length Time period : Early Cretaceous Paleoart speculativometer : Few missing details The animal drawn is a vinegaroon, an arachnid looking a bit like a scorpion with long thin first legs used as antennae
@amypteride.bsky.socialOct 7, 2026, 4:05 PM

And to end today's topic, the usual drawing auto-feedback and refs!

Thank you for reading & I’ll see you on the next #Cheliceratime!

3/3

Is this drawing accurate ? The minute details of D. canis couldn’t be figured so it kinda looks more like a random follicle mite, but I tried to keep the D. canis profile as much as possible. Tbh I chose this view mainly to not draw in detail the legs ^^’ I chose to not make it transparent for the simplicity of the drawing, but living specimens can be transparent with bits of food passing inside them.REFERENCES · Klimov P.B., OConnor B.M., Chetverikov P.E., Bolton S.J., Pepato A.R., Mortazavi A.L., Tolstikov A.V., Bauchan G.R. & Ochoa R., 2018. Comprehensive phylogeny of acariform mites (Acariformes) provides insights on the origin of the four-legged mites (Eriophyoidea), a long branch. Molecular Phylogenetics and Evolution 119, p. 105-117. · Krantz G.W. & Walter D.E., 2009. A Manual of Acarology. 3° Edition, Texas Tech University Press, 816 pp. · Nutting W.B. & Desch C.E., 1978. Demodex canis: redescription and reevaluation. The Cornell Veterinarian 68(2), p. 139-149. · Palopoli M.F., Fergus D.J., Minot S., Pei D.T., Simison W.B., Fernandez-Silva I., Thoemmes M.S., Dunn R.R., Trautwein M., 2015. Global divergence of the human follicle mite Demodex folliculorum: Persistent associations between host ancestry and mite lineages. Proceedings of the National Academy of Sciences 112(52), p.15958-63. ESCCAP. Life cycle of Demodex of dogs and cats. Online at https://www.esccapuk.org.uk/uploads/docs/bbwkmknn_FINAL_Demodex_of_Dogs_and_Cats.pdf INaturalist, 2026. Demodex canis. Online at https://www.inaturalist.org/taxa/262784-Demodex-canis GBIF - Demodex canis https://www.gbif.org/taxon/8T4MZ ScienceDirect, 2026. Demodex canis - An overview. Online at https://www.sciencedirect.com/topics/immunology-and-microbiology/demodex-canis
@amypteride.bsky.socialOct 7, 2026, 4:05 PM

The story of this mite is a bit similar to our own follicle mites, most demodecids sharing similar life history, broad morphological trends, but it can become quite a pain in the *ss for dogs with weakened immune system.

#Cheliceratime #Arachtober
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@amypteride.bsky.socialOct 7, 2026, 4:05 PM

What time is it? It’s #Cheliceratime & #Arachtober !
And this time we're looking at a companion of dogs, Demodex canis!

All the basic infos are here but if you want to learn more, there’s more in the thread below!⬇️🧵

#mite #arachnid #demodex #arthropod #sciart #bugsky #invert

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Just like humans have their own follicle mites, this species completes its entire lifecycle thanks to dogs’ skin. On a dog with a weaken immune system, this mite can cause demodicosis. Size: roughly 200µm of body length Time period: Holocene (present day) Conservation status: Least concern/Near threatened The animal drawn looks like a worm with 8 stuby legs at the front
@amypteride.bsky.socialOct 4, 2026, 9:00 AM

What time is it? It’s #Cheliceratime & #Arachtober !
And here are the drawings of the first week of #Spideroctober, with a quick sheet for each species after the main page!

Next update for the drawing challenge next sunday!

#spider #sciart

@amypteride.bsky.socialOct 3, 2026, 9:00 AM

Part 2 with mostly eurasian tongues, from the indo-european languages to the afro-asiatic, turkic, uralic & mongolic families!

Thanks for reading, it was a massive project I was planning for a while, and I'll see you in the next #Cheliceratime! :D
#Spidersaturday #Arachtober

@amypteride.bsky.socialOct 3, 2026, 9:00 AM

Part 1, after a quick setup we dive in with isolats, minor families, american native tongues, niger-congo languages, austronesian ones and the sino-tibetan lineage!

#Cheliceratime #Arachtober #Spidersaturday
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@amypteride.bsky.socialOct 3, 2026, 9:00 AM

What time is it? It's #Cheliceratime, #Spidersaturday & #Arachtober!

And for the beginning of arachtober, let's hop on a world tour of how people say "spider" all around the world! More details in the following slides below with more than 130 languages!⬇️🧵

#spider #linguistic #arachnid #bugsky

THE MANY WAYS TO SAY “SPIDER” ACROSS THE WORLD A tree below have colorful leaves with many differente words for "spider" (clockwise from bottom left): عَنْكَبُوت Spinne ពីងពាង माकुरो hörümçək ヤテㇷ゚ মাকড়সা Kevnidenn 거미 ပင့်ကူ Spider عنکبوت Ragno 蜘蛛 ሣሬት Araignée ᎧᎾᏁᏍᎩ սարդ Pavouk Merimangë मकड़ी Araña
@amypteride.bsky.socialOct 1, 2026, 1:32 PM

This month, #Cheliceratime will be under the banner of #Arachtober!! :D🕷🕸🦂

For the occasion I prepared an arachnid-only planning, with various groups and cool topics about these critters, the post coming this Saturday 03/10 being a absolutely massive project finally making its way here!📚

#arachnid

IT’S ARACHTOBER! :D An arachnid-only month to celebrate these wonderful critters, so here’s the planning for this special month on Cheliceratime! I’ll be joining the #Spideroctober Drawing challenge too, so you’ll have addidtional drawing-only posts this month!^^ 03/10 - Linguistics 04/10 - #Spideroctober week 1 07/10 - Mite 09/10 - Vinegaroon 11/10 - #Spideroctober week 2 14/10 - Solifuge 17/10 - Spider 18/10 - #Spideroctober week 3 21/10 - Biogeography 23/10 - Harvestman 25/10 - #Spideroctober week 4 28/10 - Scorpion 30/10 - Surprise group :D 31/10 - #Spideroctober week 5 Happy #Arachtober to all of you, let’s have fun! :D
@amypteride.bsky.socialSep 30, 2026, 4:05 PM

And to end today's topic, the usual drawing auto-feedback and (a lot of) refs!

Thank you for reading & I’ll see you on the next #Cheliceratime!

4/4

And to end this post, some of you may have already known this eurypterid before, and I clearly wouldn’t be surprised. Megalograptus is one of the most featured eurypterids in pop culture, as it’s been for example on of the basis of the Ark’s eurypterid, or been the first eurypterid showed in a BBC documentary from the 2000s golden age of BBC’s paleo-documentaries. Its singular look isn’t for nothing in its popularity too, as it’s one of the few eurypterids to have a morphology easily identifiable from the eurypterid’s ground body plan and deviating clearly from a scorpion-like look unlike the way more popular pterygotids.Is this paleoart accurate ? Apart from some tiny perspective glitches, I think that’s one of the best eurypterids I’ve ever drawn. I had to redo the entire drawing because I missed the work on the species coloration, so apart from the orangy pattern (‘cause I wanted to give it more depth while still staying within the lines), the coloration is now supposed to match what’s supposed to have been the animal real colors. A lot of drawings show this animal with folded second pair of legs, so I opened them a bit to give more dynamic to the animal.REFERENCES (part 1) · Caster K.E. & Kjellesvig-Waering E.N., 1964. Upper Ordovician eurypterids of Ohio. Paleontological Research Institution 4, p. 301–342. · Clarke J.M. & Ruedemann R.., 1912. The Eurypterida of New York. Volume 1 & 2, New York State Museum Memoir 14, 628 pp. • Lamsdell J.C, 2025. Codex Eurypterida: A Revised Taxonomy Based on Concordant Parsimony and Bayesian Phylogenetic Analyses. Bulletin of the American Museum of Natural History 473, 195 pp. · Lamsdell J.C., Briggs D.E., Liu H.P., Witzke B.J., McKay R.M., 2015. The oldest described eurypterid: a giant Middle Ordovician (Darriwilian) megalograptid from the Winneshiek Lagerstätte of Iowa. BMC Ecology and Evolution 15(169), 31 pp. · Lamsdell J.C., Hoşgör I., Selden P.A., 2013. A new Ordovician eurypterid (Arthropoda: Chelicerata) from southeast Turkey: Evidence for a cryptic Ordovician record of Eurypterida. Gondwana Research 23, p. 354–366. • Schmidt M., Melzer R.R., Plotnick R.E. & Bicknel R.D.C., 2022. Spines and baskets in apex predatory sea scorpions uncover unique feeding strategies using 3D-kinematics. iScience 25(1), 14 pp.REFERENCES (part 2) · Selden P.A., 1984. AUTECOLOGY OF SILURIAN EURYPTERIDS. Special Papers in Palaeontology 32, p. 39-54. · Tetlie O.E., 2007. Distribution and dispersal history of Eurypterida (Chelicerata). Palaeogeography, Palaeoclimatology, Palaeoecology 252, p. 557–574 · Tollerton V.P., 1989. Morphology, taxonomy, and classification of the order Eurypterida Burmeister, 1843. Journal of Paleontology 63, p. 642-657. Colorado Plateau Geosystems Inc., 2023 & 2026. North America & Global Series. In DeepTimeMaps . Online at https://deeptimemaps.com/map-lists-thumbnails/global-series/ & https://deeptimemaps.com/map-lists-thumbnails/north-america/ The ICS international chronostratigraphic chart 2025. Episodes 2025. Online at https://stratigraphy.org/chart PaleoBiology DataBase, 2026. Megalograptus. Online at https://paleobiodb.org/classic/checkTaxonInfo?taxon_no=18982&is_real_user=1
@amypteride.bsky.socialSep 30, 2026, 4:05 PM

And now that the morphological side is done, there's also some things to be said about its classification and paleoecology!

#Cheliceratime
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@amypteride.bsky.socialSep 30, 2026, 4:05 PM

First, let's talk about its discovery, morphology and paleoenvironment, and oh boy there are thaings to say !

#Cheliceratime
2/4

@amypteride.bsky.socialSep 30, 2026, 4:05 PM

What time is it? It’s #Cheliceratime !
Today's entry is one of the most famous eurypterid, Megalograptus ohioensis!

All the basic infos are here but if you want to learn more, there’s more in the thread below!⬇️🧵

#arthropod #ordovician #paleoart #eurypterid #sciart #bugsky

1/4

This famous arthropod was one of the biggest eurypterids during the Ordovician period, and its genus was first identified as a graptolite. It’s well-known for the long spines on its second pair of legs and for the semi-lunar shape of its telson. Size : a bit more than 50cm of body length Time period : Late Ordovician Paleoart speculativometer : Almost a carbon copy The animal drawn looks a bit like a scorpion but without pincers, with instead large spiny arms
@amypteride.bsky.socialSep 25, 2026, 3:30 PM

And to end today's topic, the usual drawing auto-feedback and refs!

Thank you for reading & I’ll see you on the next #Cheliceratime!
3/3

Is this paleoart accurate ? I really like it, first time I try this kind of view for a scorpion and I kinda dig it, I might do it again in the future! The coloration is mainly based on sclerotinisation levels of the scorpion’s body parts. I wasn’t sure to properly draw the metasoma correctly, so for once I tried to draw it in a life position viewed from above.REFERENCES · Du S.-Y., Xuan Q., Howard R.J., Wang Y.-H., Engel M.S., Cai C.-Y., 2024. A genome-scale phylogeny of scorpions: model comparison and modeling among-site compositional heterogeneity. Palaeoentomology 7, p. 792–801. • Dunlop J.A. & Penney D., 2012. Fossil Arachnids. Monograph Series Vol.2, Siri Scientific Press. 192 pp. • Penney D., 2020. Fossil Spiders in Baltic Amber: An annotated systematic catalogue. Siri Scientific Press, 150 pp & 42 planches. • Lourenco W.R. & Weitschat W., 2009. A new species of Palaeoananteris Lourenco & Weitschat, 2001, fossil scorpion from Ukrainian amber (Scorpiones, Buthidae). Boletin Sociedad Entomológica Aragonesa 45, p. 231-2355. Dunlop J. A., Penney D. & Jekel D. 2023. A summary list of fossil spiders and their relatives. In World Spider Catalog. Natural History Museum Bern, online at http://wsc.nmbe.ch, version 23.5. Rein J.O. 202-. The Scorpion Files. Online at https://www.ntnu.no/ub/scorpion-files/index.php The ICS international chronostratigraphic chart 2025. Episodes 2025. Online at https://stratigraphy.org/chart And a huge thanks to Wilson Lourenço who made this post possible by providing me his work on the original 2009's description of Palaeoananteris ukrainensis!
@amypteride.bsky.socialSep 25, 2026, 3:30 PM

More details on this scorpion in these slides: its morphology, discovery, paleoenvironment, phylogeny, place in the grand scheme of Europe's scorpions evolution and some details on the Rovno amber from Ukraine!

#Cheliceratime
2/3

@amypteride.bsky.socialSep 25, 2026, 3:30 PM

What time is it? It’s #Cheliceratime & #Fossilfriday !
Today in Cheliceratime an extinct scorpion from the Eocene of Ukraine!

All the basic infos are here but if you want to learn more, there’s more in the thread below!⬇️🧵

#scorpion #arachnid #eocene #paleoart #amber #sciart #bugsky #invert

Found in a chunk of Ukrainian amber, this scorpion is a member of a genus found across the eocene european ambers, and was the first fossil scorpion named in Ukraine. Size : 2-ish cm of body length Time period : Late Eocene Paleoart speculativometer : Almost a carbon copy The animal drawn is a brown to orange scorpion viewed from above
@amypteride.bsky.socialSep 23, 2026, 4:05 PM

And of course: some references, thank you for reading I’ll see you on the next #Cheliceratime!

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REFERENCES • Bicknell R.D.C., Kimmig J., Goodman A., Turner t. & Smith P.M., 2026. New exceptionally preserved arthropod from the Furongian of Canada. BMC Biology 24 (119). • Bicknell R.D.C. & Pates S., 2020. Pictorial Atlas of Fossil and Extant Horseshoe Crabs, With Focus on Xiphosurida. Frontiers in Earth Science 8, Article 98, 60 pp. • Caster K.E. & Brooks H.K., 1956. New fossils from the Canadian–Chazan (Ordovician) hiatus in Tennessee. Bulletins of American Paleontology 36, p. 157–199. · Hu S., Feldmann R.M., Schweitzer C.E., Benton M.J., Huang J., Wen W., Min X., Zhang Q., Zhou C. & Ma Z., 2022. A new horseshoe crab from the Permian-Triassic transition of South China: Xiphosurids as key components of post-extinction trophic webs. Palaeogeography, Palaeoclimatology, Palaeoecology 602, 111178. • Jocqué R. & Dippenaar-Schoeman A.S., 2007. Spider Families of the World. 2° Edition, Royal Museum of Central Africa, 336 pp. · Krantz G.W. & Walter D.E., 2009. A Manual of Acarology. 3° Edition, Texas Tech University Press, 816 pp. ICZN, 2026. ICZN code. Online at https://www.iczn.org/the-code/the-code-online/
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