Losso et al. (2026-10 preprint, bioRxiv)
「三葉虫類の神経系および大顎類の中心複合体の初期進化」
The trilobite nervous system and the early evolution of the mandibulate central complex
doi.org/10.64898/202...
三葉虫類がステム大顎類であることを支持！！
Supports that trilobites are stem mandibulates!
「三葉虫類の神経系および大顎類の中心複合体の初期進化」
The trilobite nervous system and the early evolution of the mandibulate central complex
doi.org/10.64898/202...
三葉虫類がステム大顎類であることを支持！！
Supports that trilobites are stem mandibulates!
October 7, 2026 at 1:50 PM
Losso et al. (2026-10 preprint, bioRxiv)
「三葉虫類の神経系および大顎類の中心複合体の初期進化」
The trilobite nervous system and the early evolution of the mandibulate central complex
doi.org/10.64898/202...
三葉虫類がステム大顎類であることを支持！！
Supports that trilobites are stem mandibulates!
「三葉虫類の神経系および大顎類の中心複合体の初期進化」
The trilobite nervous system and the early evolution of the mandibulate central complex
doi.org/10.64898/202...
三葉虫類がステム大顎類であることを支持！！
Supports that trilobites are stem mandibulates!
Quoient?! #wikifun
Je découvre que les insectes sont des crustacés. En gros :
Arthropodes
└ Chelicerates
└ par là des Arachnides mais pas que
└ Mandibulates
└ Myriapodes
└ Pancrustacés
└ Crustacé
└ Insectes
en.wikipedia.org/wiki/Crustac...
Je découvre que les insectes sont des crustacés. En gros :
Arthropodes
└ Chelicerates
└ par là des Arachnides mais pas que
└ Mandibulates
└ Myriapodes
└ Pancrustacés
└ Crustacé
└ Insectes
en.wikipedia.org/wiki/Crustac...
Crustacean - Wikipedia
en.wikipedia.org
August 16, 2026 at 1:53 PM
Quoient?! #wikifun
Je découvre que les insectes sont des crustacés. En gros :
Arthropodes
└ Chelicerates
└ par là des Arachnides mais pas que
└ Mandibulates
└ Myriapodes
└ Pancrustacés
└ Crustacé
└ Insectes
en.wikipedia.org/wiki/Crustac...
Je découvre que les insectes sont des crustacés. En gros :
Arthropodes
└ Chelicerates
└ par là des Arachnides mais pas que
└ Mandibulates
└ Myriapodes
└ Pancrustacés
└ Crustacé
└ Insectes
en.wikipedia.org/wiki/Crustac...
Taco-shaped arthropod fossils give new insights into the history of the first mandibulates phys.org/news/2024-07...
Taco-shaped arthropod fossils give new insights into the history of the first mandibulates
A new study, led by paleontologists at the Royal Ontario Museum (ROM) is helping resolve the evolution and ecology of Odaraia, a taco-shaped marine animal that lived during the Cambrian period.
phys.org
July 25, 2024 at 2:51 PM
Taco-shaped arthropod fossils give new insights into the history of the first mandibulates phys.org/news/2024-07...
Absolutely. There's a tendency to view arthropods, and even just Invertebrates, as this monolith of alien life, much the same thing together. But it's nothing like that. Mandibulates, chelicerates, the groups therein - it's so much more beautiful when you realise how complex the relationships are.
October 29, 2025 at 2:07 PM
Absolutely. There's a tendency to view arthropods, and even just Invertebrates, as this monolith of alien life, much the same thing together. But it's nothing like that. Mandibulates, chelicerates, the groups therein - it's so much more beautiful when you realise how complex the relationships are.
okay no i know they're myriapods and not insects or crustaceans, naturally. But "arthropod" is what i'd call bug, maybe even panarthropod.
And even if you wanna go further in they ARE mandibulates. So more closely related to crustaceans and thusly insects than any other arthropods. I think bugs
And even if you wanna go further in they ARE mandibulates. So more closely related to crustaceans and thusly insects than any other arthropods. I think bugs
October 19, 2025 at 3:37 PM
okay no i know they're myriapods and not insects or crustaceans, naturally. But "arthropod" is what i'd call bug, maybe even panarthropod.
And even if you wanna go further in they ARE mandibulates. So more closely related to crustaceans and thusly insects than any other arthropods. I think bugs
And even if you wanna go further in they ARE mandibulates. So more closely related to crustaceans and thusly insects than any other arthropods. I think bugs
Why Mollisonia is important in understanding chelicerates' evolution is because of what it represent before the group really exploded later in the Ordovician (+the usual drawing auto-feedback & some refs).
Thank you for reading & I’ll see you on the next #Cheliceratime!
4/4
Thank you for reading & I’ll see you on the next #Cheliceratime!
4/4
February 27, 2026 at 6:50 PM
Why Mollisonia is important in understanding chelicerates' evolution is because of what it represent before the group really exploded later in the Ordovician (+the usual drawing auto-feedback & some refs).
Thank you for reading & I’ll see you on the next #Cheliceratime!
4/4
Thank you for reading & I’ll see you on the next #Cheliceratime!
4/4
古代のタコス型節足動物に大顎があることが判明し長年の謎が解明される
https://gigazine.net/news/20240729-odaraia-mandibulates-insights/
https://gigazine.net/news/20240729-odaraia-mandibulates-insights/
古代のタコス型節足動物に大顎があることが判明し長年の謎が解明される
体全体が背甲で包まれ、まるで「タコス」のように見える古代生物「オダライア」に大顎があることが判明しました。100年以上前に発見されたオダライアが一体どんな生き物だったのか、何をどのように食べていたのかといった疑問が、今回の発見で解消される見込みです。
gigazine.net
July 28, 2024 at 9:00 PM
古代のタコス型節足動物に大顎があることが判明し長年の謎が解明される
https://gigazine.net/news/20240729-odaraia-mandibulates-insights/
https://gigazine.net/news/20240729-odaraia-mandibulates-insights/
Sea spiders are one of the three living types of chelicerate, along with horseshoe crabs and arachnids. Sea spiders are of course not spiders (spiders come under arachnids), and horseshoe crabs are not crabs (crabs are mandibulates, the cheeky devils!).
February 21, 2026 at 7:08 PM
Sea spiders are one of the three living types of chelicerate, along with horseshoe crabs and arachnids. Sea spiders are of course not spiders (spiders come under arachnids), and horseshoe crabs are not crabs (crabs are mandibulates, the cheeky devils!).
I can’t look at crabs the same way now I know they’re mandibulates. Mouth-legs not good enough for you, eh? Quitters!
February 18, 2025 at 10:06 PM
I can’t look at crabs the same way now I know they’re mandibulates. Mouth-legs not good enough for you, eh? Quitters!
#SICB2018 Caron: origin of mandibulates still very controversial. Reconstructing body plan evolution depends critically on fossil record. Burgess Shale displays various stem-groups of many phyla, suggesting rapid radiation of body plans.
February 22, 2025 at 8:52 AM
#SICB2018 Caron: origin of mandibulates still very controversial. Reconstructing body plan evolution depends critically on fossil record. Burgess Shale displays various stem-groups of many phyla, suggesting rapid radiation of body plans.
"These spines could intertwine, capturing smaller prey as though a fishing net, suggesting how some of these first mandibulates were able to leave the sea floor and survive in the water column, setting the seeds for their future ecological success."
August 5, 2024 at 1:17 PM
"These spines could intertwine, capturing smaller prey as though a fishing net, suggesting how some of these first mandibulates were able to leave the sea floor and survive in the water column, setting the seeds for their future ecological success."
youre picking up on convergent evolutionary traits! the second pair of antennae on a crab are more similar in origin to the scorpion's claws than crab pincers despite their similarity in appearance. crabs are NOT arachnids but spiders and crabs ARE both arthropods. chelicerates vs mandibulates.
August 16, 2025 at 2:31 PM
youre picking up on convergent evolutionary traits! the second pair of antennae on a crab are more similar in origin to the scorpion's claws than crab pincers despite their similarity in appearance. crabs are NOT arachnids but spiders and crabs ARE both arthropods. chelicerates vs mandibulates.
That whole group (including sea spiders) are chelicerates. That's like one side of arthropods. Then there's mandibulates, containing centipedes/millipedes, all of crustaceans, and insects (insects are part of crustaceans)
There's a lot of arthropods 🤣
There's a lot of arthropods 🤣
June 20, 2023 at 1:11 AM
That whole group (including sea spiders) are chelicerates. That's like one side of arthropods. Then there's mandibulates, containing centipedes/millipedes, all of crustaceans, and insects (insects are part of crustaceans)
There's a lot of arthropods 🤣
There's a lot of arthropods 🤣
Taco-shaped arthropod fossils gives new insights into the history of the first mandibulates – ScienceDaily | MORE at EcoSearch
July 24, 2024 at 5:08 PM
Taco-shaped arthropod fossils give new insights into the history of the first mandibulates – Phys.org | MORE at EcoSearch
July 23, 2024 at 11:22 PM
種のリストすごく分かりやすい。他の分類群にもこういう表が欲しかった。
rs.figshare.com/articles/jou...
rs.figshare.com/articles/jou...
Supplementary Material, contents from The problematic Cambrian arthropod Tuzoia and the origin of mandibulates revisited
The origin of mandibulates, the hyperdiverse arthropod group that includes pancrustaceans and myriapods, dates back to the Cambrian. Bivalved arthropod groups such as hymenocarines have been argued to be early mandibulates, but many species are still poorly known, and their affinities remain uncertain. One of the most common and globally distributed Cambrian bivalved arthropods is Tuzoia. Originally described in 1912 from the Burgess Shale based on isolated carapaces, its full anatomy has remained largely unknown. Here, we describe new specimens of Tuzoia from the Canadian Burgess Shale (Wuliuan, Cambrian) showcasing exceptionally preserved soft tissues, allowing for the first comprehensive reconstruction of its anatomy, ecology and evolutionary affinities. The head bears antennae and differentiated cephalic appendages. The body is divided into a cephalothorax and a homonomous trunk bearing ca 10 pairs of legs with heptopodomerous endopods and enlarged basipods, and two pairs of caudal rami form a tail fan. These traits suggest that Tuzoia swam along the seafloor and used its spinose legs for predation or scavenging. Tuzoia is retrieved by a Bayesian phylogenetic analysis as an early mandibulate hymenocarine lineage, exemplifying the rapid diversification of this group in open marine environments during the Cambrian Explosion.
rs.figshare.com
February 10, 2026 at 2:21 AM
種のリストすごく分かりやすい。他の分類群にもこういう表が欲しかった。
rs.figshare.com/articles/jou...
rs.figshare.com/articles/jou...
New fossil evidence from Jiangfengia multisegmentalis clarifies the evolutionary split between mandibulates and chelicerates, offering insight into the origins of arthropod diversity.
An ancient signpost: Minute fossils tell big story about arthropod evolution
A tiny fossil of a sea creature that lived more than half a billion years ago sheds new light on the evolution of arthropods, the most species-rich and successful group of animals to inhabit Earth, according to a study published in Nature Communications.
phys.org
August 28, 2025 at 9:00 AM
New fossil evidence from Jiangfengia multisegmentalis clarifies the evolutionary split between mandibulates and chelicerates, offering insight into the origins of arthropod diversity.
Granted, some arthropods use external genitals for alternating current in reproduction too, but diverse as mandibulates & chelicerates may be, we can't base our biophysical sciences entirely on niche animals, when other living kingdoms flourish with none but direct current pulse to stimulate growth.
•Ovipositor
•Gonopores
•Scape
•Epygyne
Arthropod reproductive exocrine is vastly more complex than vertebrate.
At the very least,
GIVE WOMEN BACK THEIR CLITORIDES, COMMON AMONG ALL EUTHERIANS!
•Gonopores
•Scape
•Epygyne
Arthropod reproductive exocrine is vastly more complex than vertebrate.
At the very least,
GIVE WOMEN BACK THEIR CLITORIDES, COMMON AMONG ALL EUTHERIANS!
January 1, 2026 at 6:20 AM
Granted, some arthropods use external genitals for alternating current in reproduction too, but diverse as mandibulates & chelicerates may be, we can't base our biophysical sciences entirely on niche animals, when other living kingdoms flourish with none but direct current pulse to stimulate growth.
ニュースだよ～
＞古代のタコス型節足動物に大顎があることが判明し長年の謎が解明される
- https://gigazine.net/news/20240729-odaraia-mandibulates-insights/
＞古代のタコス型節足動物に大顎があることが判明し長年の謎が解明される
- https://gigazine.net/news/20240729-odaraia-mandibulates-insights/
July 28, 2024 at 9:07 PM
ニュースだよ～
＞古代のタコス型節足動物に大顎があることが判明し長年の謎が解明される
- https://gigazine.net/news/20240729-odaraia-mandibulates-insights/
＞古代のタコス型節足動物に大顎があることが判明し長年の謎が解明される
- https://gigazine.net/news/20240729-odaraia-mandibulates-insights/
Trilobites actually belong to a completely extinct arthropod group called Artiopoda.
It’s currently debated whether Artiopoda are closer to:
1) centipedes, crustaceans and insects (mandibulates)
2) sea spiders, horseshoe crabs and arachnids (chelicerates)
3) equally distant from both 1 and 2.
It’s currently debated whether Artiopoda are closer to:
1) centipedes, crustaceans and insects (mandibulates)
2) sea spiders, horseshoe crabs and arachnids (chelicerates)
3) equally distant from both 1 and 2.
November 15, 2024 at 4:34 PM
Trilobites actually belong to a completely extinct arthropod group called Artiopoda.
It’s currently debated whether Artiopoda are closer to:
1) centipedes, crustaceans and insects (mandibulates)
2) sea spiders, horseshoe crabs and arachnids (chelicerates)
3) equally distant from both 1 and 2.
It’s currently debated whether Artiopoda are closer to:
1) centipedes, crustaceans and insects (mandibulates)
2) sea spiders, horseshoe crabs and arachnids (chelicerates)
3) equally distant from both 1 and 2.
I looked up mandibulates & I was EXTREMELY WRONG! It's the sister branch to chelicerates, i.e. spiders, scorpions & horseshoe crabs family. My mind is slightly blown, I'm not sure if I forgot or never realized how distant spiders & insects actually are. Lobsters and millipedes are closer relatives.
July 24, 2024 at 10:02 AM
I looked up mandibulates & I was EXTREMELY WRONG! It's the sister branch to chelicerates, i.e. spiders, scorpions & horseshoe crabs family. My mind is slightly blown, I'm not sure if I forgot or never realized how distant spiders & insects actually are. Lobsters and millipedes are closer relatives.
(reading more carefully I think I understand a bit better the true innovation of this paper is discovering the animal's mandibles, thus proving it's one of the first mandibulates. So "it's like, a shrimp" actually IS the cool part lol)
July 24, 2024 at 9:55 AM
(reading more carefully I think I understand a bit better the true innovation of this paper is discovering the animal's mandibles, thus proving it's one of the first mandibulates. So "it's like, a shrimp" actually IS the cool part lol)
They are!
I wonder why they think it swam upside-down. The actual article isn't open access.
I bet it's one of those things where if they drew it right-side up we'd realize it's just, like, a shrimp
(til about the clade "mandibulates" which sounds in practice like "all the arthropods u think of")
I wonder why they think it swam upside-down. The actual article isn't open access.
I bet it's one of those things where if they drew it right-side up we'd realize it's just, like, a shrimp
(til about the clade "mandibulates" which sounds in practice like "all the arthropods u think of")
July 24, 2024 at 9:47 AM
They are!
I wonder why they think it swam upside-down. The actual article isn't open access.
I bet it's one of those things where if they drew it right-side up we'd realize it's just, like, a shrimp
(til about the clade "mandibulates" which sounds in practice like "all the arthropods u think of")
I wonder why they think it swam upside-down. The actual article isn't open access.
I bet it's one of those things where if they drew it right-side up we'd realize it's just, like, a shrimp
(til about the clade "mandibulates" which sounds in practice like "all the arthropods u think of")
Apparently reasons to reject mandibulates, chelicerates and artiopoda (Trilobite kin) as parent clades, as well as other potential affinities, but I highly suspect this might change if we get hard parts.
April 6, 2025 at 3:17 PM
Apparently reasons to reject mandibulates, chelicerates and artiopoda (Trilobite kin) as parent clades, as well as other potential affinities, but I highly suspect this might change if we get hard parts.