#Acariformes
LightNews LightNews
piotrgasiorowski.bsky.social
Fungivorous #mites of the order #Oribatida (not to be confused with ticks). Kicin, Wielkopolska (western Poland).
#Acariformes #roztocze #arthropods #stawonogi #acarology #zoology
May 6, 2025 at 10:25 PM
yama2186.bsky.social
•Acariformes to chew 🍬😋

[Oribatida/ Oribatid mites on fig trunk]

#Oribatida #Acariformes #wildlifephotography #Afni #macrophotography #ParcoAltaMurgia #Apulia #Italy
May 1, 2026 at 8:02 AM
bou.org.uk
Patterns of feather mite (Acariformes: Astigmata) prevalence and load in a promiscuous bird during the breeding season | www.sciencedirect.co... | International Journal for Parasitology: Parasites and Wildlife | #ornithology 🪶
December 4, 2024 at 7:30 AM
yama2186.bsky.social
•Balaustium murorum

[Ragnetto rosso/Red velvet mite]

#balaustiummurorum #Arachnida #Acariformes #wildlifephotography #Afni #macrophotography #Apulia #Italy
April 22, 2026 at 12:18 PM
idrawsdinosaurs.bsky.social
Identifications 1/2:
A. Ixodida (ticks)
B. Ricinulei (hooded tickspiders)
C. Araneae (spiders)
D. Pseudoscorpiones (pseudoscorpions)
E. Opiliones (harvestmen)
F. Pycnogonida (sea spiders)
G. Acariformes (mites)
H. Scorpiones (scorpions)
September 30, 2026 at 5:19 AM
inaturalist.bsky.social
There are currently about 12k described species of beetle mite, but it's estimated 60k-120k species exist! www.inaturalist.org/taxa/332183-...
beetle mites (Suborder Oribatida)
Oribatida (formerly Cryptostigmata), also known as moss mites or beetle mites, are an order of mites, in the 'chewing Acariformes' clade Sarcoptiformes. They range in size from 0.2 to 1.4 millimetres ...
www.inaturalist.org
March 15, 2025 at 3:54 PM
freelivingmite.bsky.social
論文はこちらから．Open access
doi.org/10.12782/spe...
April 24, 2024 at 5:39 AM
hourlyspecies.bsky.social
Genus/Species: Acariformes
Subtitle: The "mite-like" mites
Image of Acariformes
December 27, 2024 at 12:14 AM
bloodsparasites.bsky.social
A case of human trombiculosis caused by Eutrombicula alfreddugesi (Acariformes: Prostigmata: Trombiculidae) in Chamela, Jalisco, Mexico PubMed
A case of human trombiculosis caused by Eutrombicula alfreddugesi (Acariformes: Prostigmata: Trombiculidae) in Chamela, Jalisco, Mexico
A case of trombiculosis is presented at the Estación de Biología Chamela in Jalisco, Mexico. This occurred during an expedition in search of parasites in the fall of 2024. One of the participants presented small red macules on her shins and ankles, and when these were observed with a portable magnifying glass, the presence of chiggers (Trombiculidae) was confirmed. The mites were identified as Eutrombicula alfreddugesi (Oudemans), which caused severe trombiculosis due to hypersensitivity in the...
dlvr.it
October 2, 2026 at 7:47 AM
lucaskias.bsky.social
Beyond spiders and scorpions, Chelicerates are arthropod animals belonging to the subphylum Chelicerata. They are mainly characterized by having "chelicerae," which are the first pair of appendix near the mouth that can be shaped like a stinger or a chelae (similar to crab pincers).
#SciArt
The illustrations are in poster format. It is the first of four parts. All are digital arts. This first part shows 14 species of Chelicerta that represent the main classes of the group: Pycnogonida, Xiphosura, Amblypygi, Solifugae, Ricinulei, Opiliones, Thelyphonida, Areanea, Parasitiformes, Pseudoscorpiones, Palpigradi, Scorpiones, Schizomida and Acariformes. The next parts will show the common and species names of each one. What are the species illustrated in this poster? 1. Sea spider (Anoplodactylus californicus); 2. Horseshoe crab (Limulus polyphemus); 3. Whip spider (Heterophrynus longicornis); 4. Camel spider (Gaucha fasciata) What are the species illustrated in this poster? 5. Hooded tickspider (Cryptocellus simonis); 6. Harvestmen (Cynortellana pulchra); 7. Whip scorpion (Heptatarsus brasilianus); 8. Tarantula (Lasiodora parahybana) What are the species illustrated in this poster? 9. Tick (Amblyomma rotundatum); 10. False scorpion (Paratemnoides nidificator); 11. Microwhip scorpion (Eukoenenia spelaea); 12. Scorpion (Tityus neglectus); 13. Short-tailed whip scorpion (Rowlandius sp.); 14. Spider mite (Tetranychus urticae)
April 28, 2026 at 11:46 AM
cesarfavacho.bsky.social
Uma curiosidade interessante: ácaros e carrapatos são bem aparentados, com alguns ácaros sendo mais próximos dos carrapatos do que outros. Existem duas grandes super ordens desses aracnídeos: Parasitiformes (carrapatos e alguns ácaros) e Acariformes (os ácaros restantes, mais diversos)
A imagem mostra um carrapato em um fundo branco. Ele tem o corpo oval, de coloração marrom escura. Suas 8 pernas e estrutura bucal são marrom claras. Aqui vemos um carrapato grudado na pele de uma pessoa branca. A imagem está em close e é possível ver a textura da pele, assim como os pelos corporais. O carrapato está preso pelo aparelho bucal e a área onde ele está grudado está um pouco mais avermelhada
May 3, 2025 at 8:10 PM
biogeneurope.bsky.social
A beautiful start of the new year: there's is new BGE research paper! ✨ 🤩

In their paper Pešić et al. discuss the phylogeny of a group of water mites (Hygrobates longipalpis complex). They also highlight a water mite species new to science! 🥳 🕷️

More info 👉 biodiversitygenomics.eu/2026/01/12/m...
Molecular phylogeny reveals a new species of the Hygrobates longipalpis complex from Portugal (Acariformes, Hydrachnidia, Hygrobatidae) - Biodiversity Genomics Europe
A new BGE paper has been published! The paper called 'Molecular phylogeny reveals a new species of the Hygrobates longipalpis complex from Portugal (Acariformes, Hydrachnidia, Hygrobatidae)' was writt...
biodiversitygenomics.eu
January 12, 2026 at 12:04 PM
luiscollantes.bsky.social
New paper by the YKLP!

Wu et al. - A new whip scorpion (Arachnida: Thelyphonida) with a phoretic mite (Acariformes: Trochometridiidae) from Mid- Cretaceous Kachin #amber 🦂
June 19, 2025 at 3:36 AM
amypteride.bsky.social
And of course: some references, thank you for reading I’ll see you on the next #Cheliceratime!

5/5
REFERENCES (part 1) · Costa S.G.S, Tolstikov A., Saboori A., Batista-Ribeiro D., Noei J., Harvey M.S., Shaw M.D., Klimov P.B., Zhang Z.-Q., Pepato A.R., 2024. One-way ticket to the blue: A large-scale, dated phylogeny revealed asymmetric land-to-water transitions in acariform mites (Acari: Acariformes). Molecular Phylogenetics and Evolution 177, 107626. · 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. · Linné C. von & Salvius L., 1758. Caroli Linnaei...Systema naturae per regna tria naturae :secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis. Holmiae: Impensis Direct. Laurentii Salvii. · Makol J., 2000. Catalogue of the World Trombidiidae (Acari: Actinotrichida: Trombidioidea). Annales Zoologici (Warszawa) 50(4), p. 599-625. REFERENCES (part 2) · Makol J. & Felska M., 2024. The syntopic occurrence of velvet mites Trombidium spp. (Acariformes: Trombidiidae) with the first characteristics of the larva of Trombidium heterotrichum. Scientific Reports 14, 32155, 14 pp. · Makol J. & Wohltmann A., 2000. A redescription of Trombidium holosericeum (Linnaeus, 1758) (Acari; Actinotrichida: Trombidioidea) with charasterics of all active instars and notes on taxonomy and biology. Annales Zoologici (Warszawa) 50(1), p. 67-91. · Schmidt J.O. & Schmidt L.S., 2022. Big, bad, and red: Giant velvet mite defenses and life strategies (Trombidiformes: Trombidiidae: Dinothrombium). The Journal of Arachnology 50, p. 175-180. INaturalist, 2026. Trombidium holosericeum. Online at https://www.inaturalist.org/taxa/58397-Trombidium-holosericeum GBIF - Trombidium holosericeum https://www.gbif.org/fr/species/4540860
April 8, 2026 at 4:03 PM
psocodea.bsky.social
めも　Long‐branch attraction and incomplete lineage sorting explain the unstable high‐level position of eriophyoid mites in the arachnid tree of life - Shao - 2026 - Systematic Entomology - Wiley Online Library resjournals.onlinelibrary.wiley.com/doi/10.1111/...
Long‐branch attraction and incomplete lineage sorting explain the unstable high‐level position of eriophyoid mites in the arachnid tree of life
The monophyly of Trombidiformes was rejected, rendered paraphyletic by the monophyletic Eriophyoidea lying outside the Trombidiformes. The unstable position of Eriophyoidea within Acariformes may be.....
resjournals.onlinelibrary.wiley.com
July 12, 2026 at 11:42 PM
aichina.news
For those tracking the taxonomy, many of these species belong to the family Syringophilidae. Research usually involves microscopic examination of the calamus. The 'Checklist of the quill mites (Acariformes: Syringophilidae) of the world' is a key resource for host-specificity data.
April 22, 2026 at 3:52 PM
leibnizlib.bsky.social
Because these mites are tightly linked to their hosts, they can help trace co-evolution and reveal hidden biodiversity patterns.
→ doi.org/10.1007/s112...
First record of Picobiinae mites (Acariformes: Syringophilidae) parasitising potoos (Aves: Nyctibiiformes), with description of a new species - Systematic Parasitology
Quill mites of the subfamily Picobiinae (Acariformes: Syringophilidae) are permanent ectoparasites living within the quills of feathers. Currently, the genus Gunabopicobia comprises eight described species that primarily infest pigeons and doves (Columbiformes), except for one species reported from birds-of-paradise (Passeriformes). In this study, we present the first record of Gunabopicobia parasitising potoos (Nyctibiiformes). Specimens of G. nyctibiae Skoracki & Patan n. sp. were collected from the Long-tailed Potoo Nyctibius aethereus in Brazil and the Common Potoo Nyctibius griseus in Colombia and Paraguay. The finding indicates an unusual host shift between phylogenetically distant avian clades. Moreover, the new species was found inhabiting the quills of small wing coverts, an atypical microhabitat within the Picobiinae subfamily, further suggesting the ecological flexibility of the Gunabopicobia lineage. This discovery has important implications for understanding host associations and ecological diversification within Picobiinae and highlights the need to re-evaluate host specificity patterns in the genus Gunabopicobia.
doi.org
April 22, 2026 at 2:39 PM
freelivingmite.bsky.social
doi.org/10.12782/spe...
Paper is free access, here
April 24, 2024 at 5:38 AM
nev.flipping.rocks.ap.brid.gy
#MiteMonday: mite mania! A whole bunch of _Balaustium_ scavenging a dead midge.

#Mitestodon #mites #Acari #acariformes #parasitengona #erythraeidae
About a dozen pill-shaped, long-legged raspberry red mites cling to the body of a large midge (at most ~1cm) that is lying on a large rock. Most are sinking their mouthparts into its body, but two are feeding on one of its very long, skinny legs.
July 20, 2026 at 9:00 PM
amypteride.bsky.social
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 ? I think the perspective may be a bit off, but apart from that it looks good in regard to what’s known of this mite when fully grown. I may have simplified a bit the setae coverage compared to what it would precisely look like. The drawing is a combination of several references since not all of them had the same level of detail. This specimen could either be male or female since both sexes look identical in dorsal view. REFERENCES • Block W., 1976. Oxygen Uptake by Nanorchestes antarcticus (Acari). Oikos 27(2), p. 320–323. · 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. · Lindsay K.L. 1972. Nanorchestes antarcticus Strandtmann; a taxonomic description of the instars. Acarologia 13(4), p. 593–606. · Makol J. & Felska M., 2024. New records of Collembola and Acarina in Antarctica. Pacific Insects 6(3), p. 522-523. • Sharma P.P. & Gavish-Regev E., 2025. The Evolutionary Biology of Chelicerata. Annual Review of Entomology 70, p. 143–163. GBIF - Nanorchestes antarcticus https://www.gbif.org/taxon/45N88
September 9, 2026 at 4:04 PM
caeculus.bsky.social
Very excited to see this preliminary catalog of the mites (Parasitiformes and Acariformes) found in Brazil - several thousand species are documented and many tens of thousands eventually expected. Putting together a catalog like this is a tremendous amount of work! www.scielo.br/j/zool/a/nRq...
Taxonomic Catalog of the Brazilian Fauna: The Brazilian acarofauna (Arachnida: Holothyrida, Ixodida, Mesostigmata, Opilioacarida, Sarcoptiformes, and Trombidiformes)
ABSTRACT The diversity of organisms is one of the most fundamental questions in sciences. Here,...
www.scielo.br
October 18, 2025 at 1:51 PM
amypteride.bsky.social
Due to how frequently humans encounter these mites, they have been studied for a long time, especially thanks to the works of Alfred Napela, and called under different names (+the usual drawing auto-feedback & refs).

Thank you for reading & I’ll see you on the next #Cheliceratime!
Eriophyes tiliae was at first named “Phytoptus tiliae” in 1857 by Heinrich Pagenstecher, a German zoologist. It was renamed and moved to its own genus 33 years later by Alfred Napela. This Austrian scientist was an acarologist who specialized in the study of eriophyids, which was back in that time close to ground level. He extensively described European species in every way possible while also naming more than 400 species, which ended in the beginning of the XX° century by the making of the bases of a modern classification of these mites, propeling gall mites to one of the best studied mites at this time. The original Phytoptus assignation of this mite is sometimes still seen in a way with the use of the “platyphyllos group”, an outdated taxonomic grouping of several four-legged mites impacting lime trees that includes E. tiliae and some Phytoptus species. Due to how frequently humans encounter this animal & its close lookalike relatives, it’s among the mites with known common names across languages. Most languages name the animal by associating it with the gall it produces. Bulgarian/български => Кадифен кърлеж Czech/čeština => vlnovník lipový, vlnovník kroužkovaný Danish/Dansk => Lindepunggalmide English => Lime Nail Gall, Red Nail Gall Mite, Lime Nail Gall Mite Estonian/Eesti keel => Pärna-pahklest French/Français => Acarien de la galle cornue du Tilleul, Phytopte du tilleul German/Deutsch => Lindengallmilbe Hungarian/Magyar => Hársgubacsatka Lithuanian/Lietuvių kalba => Liepinė gyslinė erkė Dutch/Nederland => Lindehoorntjesmijt Polish/Polski => Różkowiec lipowy Russian/русский язык => Липовый галловый клещ Swedish/Svenska => Lindhorn Is this drawing accurate ? There’s really not that much to say since it’s basically a “what if a mite turned into a worm”, but I really liked to draw this one even tho it took longer than expected! The precise count of rings may not be right tbh. I tried to pay as much attention as possible to the shield morphology (and it’s heart-shaped :3). REFERENCES · Alford D.V., 2012. Chapter 3: Mites. Pests of Ornamental Trees, Shrubs and Flowers. 2° Edition, Elsevier, p. 405-433. · Vacante V., 2016. The handbook of mites of economic plants: Identification, bio-ecology and control. Elsevier, 872 pp. · 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. · Shevtshenko V.G., 1967. To the 110th anniversary of Doctor Alfred Nalepa. Acarologia 9(3), p. 467-474. · Soika G. & Kozak M., 2013. Eriophyes species (Acari: Eriophyoidea) inhabiting lime trees (Tilia spp.: Tiliaceae)—supplementary description and morphological variability related to host plants and female forms. Zootaxa 3646, p. 349-385. INaturalist, 2026. Eriophyes tiliae. Online at https://www.inaturalist.org/taxa/319872-Eriophyes-tiliae
May 20, 2026 at 4:07 PM
amypteride.bsky.social
Chelicerates comprise diverse groups extinct as extant from spiders to mites, eurypterids or other weirdos, and have a rich evolutionary history going back to the cambrian: they've known a time without land plants, the dinosaurs golden age & now they walk alongside us.

#Cheliceratime
3/6
A diverse group today... Pycnogonids/"Sea spiders" Palpigrades Mites => Acariformes => Parasitiformes Solifugids/"Camel spiders" Harvestmen Ricinuleids Xiphosurans/"Horseshoe crabs" Pseudoscorpions/"False scorpions"/Book scorpions" Scorpions Spiders Uropygids/"vinegaroons"/"whip scorpions" Schizomids Amblypygids/"Whyp spiders"/Tailless whip scorpions" ... as well as a diverse group in the past Mollisonids & Habelids Chasmataspidids 'Synziphosurines' Eurypterids/"Sea scorpions" Phalangiotarbids Trigonotarbids Haptopods Uraraneids & other stem-spiders And other weirdos Chelicerates' evolutionary history Part 1: 538,8-251,9 million years ago Cambrian (538,8-486,8 Mya) First euchelicerates & pycnogonids appear during the Cambrian explosion as small bottom-dwellers and background species, shadowed by other more ancient groups. Ordovician (486,8-443,1 Mya) Evolutionary radiation, chelicerates become major predators & scavengers in various environments: first eurypterids, chasmataspidids & horseshoe crabs, cryptic terrestrializations, numerous bottom dwellers. Silurian (443,1-419,6 Mya) Eurypterids’ golden age, first members of known firmly terrestrial arachnid lineages (scorpions, trigonotarbids) Devonian (419,6-358,8 Mya) Arachnids radiate on land (first harvestmen, mites & tetrapulmonates) and establish themselves as vital parts of terrestrial ecosystems. Modern pycnogonids appear. Slow decrease in mean size and ecological importance of aquatic euchelicerates (horseshoe crabs, eurypterids, chasmataspidids for the main trio). Carboniferous (358,8-298,9 Mya) Freshwater horseshoe crabs & eurypterids. Confirmed ocurrences of most known arachnids orders with ground-based & arboreal members. Radiation of the tetrapulmonates: first spiders, vinegaroons & amblypygids. Pangea assemblage allows terrestrial & freshwater groups to be distributed worldwide. Permian (298,9-251,9 Mya) Cryptic diversification among mites and other arachnids orders. Permian-Triassic Mass extinction: extinction of many paleozoic groups like eurypterids, trigonotarbids & many primitive lineages, acting as a bottleneck for chelicerates’ diversity. Chelicerates' evolutionary history Part 2: 251,9 million years ago-Today Triassic (251,9-201,4 Mya) Post extinction recovery & diversification: large cryptic radiation of spiders post Permian-Triassic extinction (potential apparition of the true spider webs), horseshoe crabs radiation in salt & freshwaters. Jurassic (201,4-143,1 Mya) Continuation of Triassic radiations: horseshoe crabs limited to saltwater, spiders already well implemented in ecosystems with various ecological types, modern pycnogonids groups present. Pangea break-up begins to isolate groups in certain continents and leave marks that will guide arachnids’ evolution up to today. Cretaceous (143,1-66 Mya) Huge ecological diversification of spiders linked to the rise of flowering plants & more modern insect fauna: sticking webs become more widespread, development of ground-based species. Intense period of evolutionary radiation on land for groups like schizomids, spiders or amblypygids, facilitated by Pangea break-up and geographic isolation, most of the modern arachnid families (or at least their ancestors) are supposed to appear during this time. Paleogene (66-23 Mya) Araneoids & RTA spiders’ radiation, including the first jumping spiders. Recovery post-extinction, transitional phase between mesozoic and modern faunas. Aquatic chelicerates now restricted to marine horseshoe crabs & pycnogonids. Neogene & Quaternary (23-0 Mya) Modern arachnofauna on land. Scorpion’s venom becomes potent to mammals. Orbweavers, jumping & wolf spiders and several other spider groups become diverse & worldwide.
March 25, 2026 at 5:15 PM
amypteride.bsky.social
For these drawings, it's apulmonate arachnids time: harvestmen, mites, ticks, solifugids, palpigrades & a phalangiotarbid!

#arachnid #mite #tick #solifugid #arthropod #paleoart #sciart #invert #bugsky
3/6
HARVESTMEN Mitostoma gruberi Late Eocene, 1,5-ish cm in main body length The animal drawn is a harvestman, a spider-like animal with extremely long thin legs and a main body made of 1 part (spider's body is split in 2 parts Neokayania bicolumnata Holocene (Present day), 0,5-ish cm in length The animal drawn is a harvestman with super thin & long legs, way longer than its small boxy body. The main body also comprise 2 raised areas making it looks like a bit like a bunny cartoon head Phalangium opilio Holocene (Present day), 0,6-ish cm in main body length The animal drawn is a harvestman, a spider-like animal with extremely long thin legs and a main body made of 1 part (spider's body is split in 2 parts Neopantopsalis pentheter Holocene (Present day), 4-ish mm in main body length The animal drawn is a harvestman, a spider-like animal with extremely long thin legs and a main body made of 1 part (spider's body is split in 2 parts) PARASITIFORMES Sternothyrus braueri Holocene (Present day), 0;5-ish cm in length The animal drawn is a reddish mite with a ball-shaped body and 8 walking legs Dermacentor rerticulatus Holocene (Present day), 4-ish mm in length The animal drawn is a tick (round body, short legs, short mouthparts to suck blood) with colored pattern on its back made of yellown red & black Macrocheles subbadius Holocene (Present day), 0,6-ish mm in length The animal drawn is a mite with a brown reddish main body, 8 yellow legs and ellongeted pincer-like chelicerae PHALANGIOTARBIDS Mesotarbus peteri Late Carboniferous, 1,2-ish cm in length The animal drawn is a phalangiotarbid, an arachnid looking a bit like a super heavy spider and with an abdomen made of 6 little segments followed by a broad plate taking up to 2/3 of the abdomen's length PALPIGRADES Eukoenenia mirabilis Holocene (Present day), 2-ish mm in length The animal drawn is a palpigrade, a beige scorpion/spider like animal but with long front legs and a long tail-like flagellum at its end Electrokoenenia yaksha Late Cretaceous, 1,5 mm in length The animal drawn is a palpigrade, a beige scorpion/spider like animal but with long front legs and a long tail-like flagellum at its end SOLIFUGES Rhagodes melanus Holocene (Present day), 2-ish cm in length The animal drawn is a black solifuge, looking a bit like a spider but with short large pincers instead of fangs, & with long pedipalps almost leg-like compared to the small pedipalps of spiders Metasolpuga picta Holocene (Present day), 2-ish cm in length The animal drawn is a black solifuge, looking a bit like a spider but with short large pincers instead of fangs, & with long pedipalps almost leg-like compared to the small pedipalps of spiders, and long legs. it's mainly yellow but a bit red & orange on its head ACARIFORMES Eriophyes tiliae Holocene (Present day), 0,2-ish mm in length The animal drawn is a mite with a worm-like body and 4 short legs at its body front Trombidium holosericeum Holocene (Present day), 2-ish mm in length The animal drawn is a mite with a large red main body & 8 short but thin legs Acarus siro Holocene (Present day), 0,5-ish mm in length The animal drawn is a small mite with a rounded oval body, long filaments and 8 stuby legs Gehypochthonimimus hibernicus Early Carboniferous, 0,43 mm in length The animal drawn is a yellow mite with long setae on its back
August 5, 2026 at 3:03 PM
amypteride.bsky.social
To end this thread, I wanted to add a lil' note on humans' perception about chelicerates, and of course some references, I hope this thread helped when it comes to understand what is said in Cheliceratime's posts!^^

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

6/6
Chelicerates & humans Human’s perception of chelicerates is... complicated. Arachnids (and especially spider-looking ones) are often subjects to arachnophobia, and the disconnection between humans and chelicerates often makes it hard for many people to sympathize with them. They are also harvested economically to the point of risking extinction, like for horseshoe crabs & many spiders. However, of the more than a hundred thousand species, very few pose a threat to humans, and we still know little of their behaviors for many species. Whether we like it or not, they are a vital part of Earth’s ecosystems, spiders’ regulation of insects making them the most important predators for land ecosystems. Most of these views are tied to our link with nature and how we perceive it, arachnids being typically non-charismatic animals for numerous people. And I hope your time on these posts will help you see them from a new perspective, not as monsters, but incredibly diverse & fascinating animals :) REFERENCES (part 1) · Aria C. & Caron J.-B., 2019. A middle Cambrian arthropod with chelicerae and proto-book gills. Nature 573, p. 586–589. · Benavides L.R., Cosgrove J.G., Harvey,M.S. & Giribet G., 2019. Phylogenomic interrogation resolves the backbone of the Pseudoscorpiones tree of life. Molecular Phylogenetics and Evolution 139, article 106509. • 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. • Cloudsley-Thompson J.L., 1977. Adaptational biology of Solifugae (Solpugida). Bulletin of the British Arachnological Society 4, p. 61-71. · Clouse R.M et al., 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. · De Miranda G.S., Kulkarni S.S., Tagliatela J., Baker C.M., Giupponi A.P.L., Labarque F.M., Gavish-Regev E., Rix M.G., Carvalho L.S., Fusari L.M., Harvey M.S., Wood H.M. & Sharma P.P., 2024. The Rediscovery of a Relict Unlocks the First Global Phylogeny of Whip Spiders (Amblypygi). Systematic Biology 73, p. 495–505. • Derkarabetian S., Lord A., Angier K., Frigyik E. & Giribet G., 2023. An Opiliones-specific ultraconserved element probe set with a near-complete family-level phylogeny. Molecular Phylogenetics and Evolution 187, article 107887. · Dunlop J.A. & Lamsdell J.C., 2017. Segmentation and tagmosis in Chelicerata. Arthropod Structure & Development 46, p. 395–418. • Dunlop J.A. & Penney D., 2012. Fossil Arachnids. Monograph Series Vol.2, Siri Scientific Press. 192 pp. • Garwood R.J., Dunlop J.A., 2023. Consensus and conflict in studies of chelicerate fossils and phylogeny. Arachnologische Mitteilungen: Arachnology Letters 66(1), p. 2-16. REFERENCES (part 2) • Garwood R.J. & Dunlop J.A., 2014. Three-dimensional reconstruction and the phylogeny of extinct chelicerate orders. PeerJ 2, e641, 33 pp. • Jocqué R. & Dippenaar-Schoeman A.S., 2007. Spider Families of the World. 2° Edition, Royal Museum of Central Africa, 336 pp. · 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, · Kulkarni S., Wood H.M., Hormiga G., 2023. Advances in the reconstruction of the spider tree of life: A roadmap for spider systematics and comparative studies. Cladistics 39, p. 479–532. • 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. · Penney D. & Selden P.A., 2012. Fossil Spiders The Evolutionary History of a Mega-diverse Order. Monograph Series Vol.1, Siri Scientific Press. 128 pp. • Sabroux R., 2018. Biodiversité et histoire évolutive des Pycnogonides (Arthropoda, Pycnogonida). Museum national d'histoire naturelle - MNHN PARIS, 345 pp. • Sato S., Derkarabetian S., Valdez-Mondragón A., Pérez-González A., Benavides L.R., Daniels S.R., Giribet G., 2024. Under the hood: Phylogenomics of hooded tick spiders (Arachnida, Ricinulei) uncovers discordance between morphology and molecules. Molecular Phylogenetics and Evolution 193, article 108026. • Sharma P.P. & Gavish-Regev E., 2025. The Evolutionary Biology of Chelicerata. Annual Review of Entomology 70, p. 143–163. 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.
March 25, 2026 at 5:15 PM