K.Kubo
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kkubo.bsky.social
K.Kubo
@kkubo.bsky.social
210 followers 270 following 110 posts
JSPS Postdoctoral fellow, Paleontologist, Ph.D. (Science) /Vertebrate palaeontology🦖/ EvoDevo🐣/Univ. of Tokyo

学振PD/博士(理学)/ 東京大学で、恐竜などを対象に古脊椎動物学と進化発生学的アプローチから研究しています。
https://kohta-kubo.webnode.jp/
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arctomet.bsky.social
Tucker, R.T., Venter, K.E., Lana, C. et al. U-Pb calcite age dating of fossil eggshell as an accurate deep time geochronometer. Commun Earth Environ 6, 872 (2025). doi.org/10.1038/s432...
U-Pb calcite age dating of fossil eggshell as an accurate deep time geochronometer - Communications Earth & Environment
Biogenic carbonate of eggshells can be used as a new geochronometer through direct calcite U-Pb dating, producing high accurate ages, as revealed by two tests on dinosaur eggs from North America and M...
doi.org
November 10, 2025 at 12:34 PM
kkubo.bsky.social
違国日記、なんかいい
November 9, 2025 at 5:36 AM
kkubo.bsky.social
ニューヨーク、またちゃんと時間とって滞在したいな
アメリカ自然史博物館に、セントラルパーク
November 8, 2025 at 10:13 PM
Reposted by K.Kubo
sirjoscha.bsky.social
#2025SVP ! If you want to get an idea of the major steps of 🐢turtle🐢 evolution, come to see my talk on Friday, Nov 14, 8:30 AM, Hall 8. My student Guilherme Hermanson talks just before me (8:15). 4 years of macroevolutionary research on turtles went into our talks, covering many unpublished results.
Powerpoint title slide of my SVP talk, showing a transparently rendered turtle shell with skull, limbs, and neck inside. The title of the talk is "Drivers and constraints in the evolution of the turtle body plan".
November 5, 2025 at 11:25 AM
Reposted by K.Kubo
stevebrusatte.bsky.social
Bittersweet to see our obituary of Mark Norell published in @currentbiology.bsky.social this week. Godspeed Mark, from Pete, Jim, and me--and the whole AMNH community.
November 3, 2025 at 4:30 PM
Reposted by K.Kubo
witmerlab.bsky.social
Today's bombshell in @nature.com by Lindsay Zanno & James Napoli @jgn-paleo.bsky.social (bit.ly/4qBE6ng) shows that putative juvvy T. rex fossils actually are Nanotyrannus. I reviewed the manuscript, so Nature invited me to write the News & Views commentary. Free link: rdcu.be/eNv94 🦖
The figure used in my News & Views commentary. I generated the CT-based rendering of the holotype skull of Nanotyrannus lancensis (CMNH 7541), based on a recent scan. The lower image was done by the Nature art department. Here's the free link to the print version that I'm permitted to share: https://rdcu.be/eNv94. You can't download it but you can screen-capture its two pages if you really need a copy. Our casts of (bottom) the holotype of Nanotyrannus lancensis (CMNH 7541), (middle) the newly named holotype of N. lethaeus (BMRP 2002.4.1), and (top) T. rex (AMNH 5027). We published on CMNH 7541 in 2010 (http://bit.ly/3X5nCGm).
October 30, 2025 at 9:43 PM
kkubo.bsky.social
First trip for collection visits in MOR and AMNH!
October 31, 2025 at 10:16 PM
Reposted by K.Kubo
witmerlab.bsky.social
We'll close out this #FossilFriday with the obvious choice of Nanotyrannus. I couldn't share this CT scanning session at the time (June 2023) but can now. @jgn-paleo.bsky.social brought the holotype Cleveland skull he had on loan, and CMNH VP curator Caitlin Colleary & I joined in the fun!
James Napoli, Witmer, and Cleveland Museum of Natural History Curator of Vertebrate Paleontology Caitlin Colleary with the holotype skull of Nanotyrannus (CMNH 7541) for CT scanning (June 2023). James Napoli with the holotype skull of Nanotyrannus (CMNH 7541) for CT scanning (June 2023). Cleveland Museum of Natural History Curator of Vertebrate Paleontology Caitlin Colleary with the holotype skull of Nanotyrannus (CMNH 7541) for CT scanning (June 2023). Witmer with the holotype skull of Nanotyrannus (CMNH 7541) for CT scanning (June 2023). I had this same skull on loan in my Ohio University lab for study and CT scanning for over a year and, as far as I can tell, never appeared in a photo with it. I didn't my chance this time!
October 31, 2025 at 6:51 PM
Reposted by K.Kubo
albertonykus.bsky.social
New skull material of the early therizinosaurian dinosaur Falcarius: anatomypubs.onlinelibrary.wiley.com/doi/10.1002/... 🧪 (📷 @freewillie643.bsky.social & Zanno)
Known bones in a reconstructed skull of the herbivorous theropod dinosaur Falcarius, shown in multiple views.
October 25, 2025 at 4:49 PM
Reposted by K.Kubo
macroecoevoale.bsky.social
Happy #FossilFriday! Interested in fossil data handling & building analysis-ready databases? New paper out today in Palaeontology @thepalass.bsky.social with @palaeoverse.bsky.social team led by @lewisajones.bsky.social onlinelibrary.wiley.com/doi/10.1111/...
Hope it helps! 💻📊📈🦐🦪🦣🐚🪸🦕🦖🐋🐊🐟🦑🐢🐍🦎🐦‍⬛🦂
Ten simple rules to follow when cleaning occurrence data in palaeobiology
Large datasets of fossil occurrences, often downloaded from online community-maintained databases, are a vital resource for understanding broad-scale evolutionary patterns, such as how biodiversity h...
onlinelibrary.wiley.com
October 24, 2025 at 9:40 AM
Reposted by K.Kubo
johnrhutchinson.bsky.social
New paper on crocodylian locomotor evolution led by Masaya Iijima, w/Richard Blob & me!
More erect hindlimb postures help extant gators support their weight (esp. at ankle), & how these mechanics constrained giant Deinosuchus to a slow walk at best!
The paper-- www.science.org/doi/10.1126/...
Biomechanical simulations of hindlimb function in Alligator provide insights into postural shifts and body size evolution
Locomotor simulations in alligators reveal that transitions to erect limb postures facilitate the evolution of larger body sizes.
www.science.org
October 22, 2025 at 6:40 PM
Reposted by K.Kubo
dinopantheon.bsky.social
北海道大学
新着情報: 北海道中川町で化石を含む琥珀を大量発見～世界的にも希少な太古の陸上生態系の記録～（理学研究院　准教授　伊庭靖弘） www.hokudai.ac.jp/news/2025/10...
新着情報: 北海道中川町で化石を含む琥珀を大量発見～世界的にも希少な太古の陸上生態系の記録～（理学研究院　准教授　伊庭靖弘）
2025年10月15日 北海道大学中川町教育委員会 ポイント ●多様な生物化石群を保存する1億1,500万年前の琥珀を北海道北部中川町から発見。●琥珀内の植物・昆虫・菌類などの化石には微細な解剖学的特...
www.hokudai.ac.jp
October 15, 2025 at 5:06 AM
Reposted by K.Kubo
arctomet.bsky.social
Martínez, R.N., Colombi, C.E., Ezcurra, M.D. et al. A Carnian theropod with unexpectedly derived features during the first dinosaur radiation. Nat Ecol Evol (2025). doi.org/10.1038/s415...
Client Challenge
doi.org
October 14, 2025 at 12:23 PM
Reposted by K.Kubo
museumoftherockies.bsky.social
Happy #FossilFriday! Meet Brontotholus harmoni (MOR 480), a new pachycephalosaurid from the Cretaceous Two Medicine Formation of Montana. Named after former MOR Chief Preparator Bob Harmon. Bronotoholus was named this week in a @ZoolJLinnSoc paper by MSU alumnus @doublebeam and colleagues.
Fossilized dome of Brontotholus harmoni, a large pachycephalosaurid dinosaur from the Cretaceous Two Medicine Formation of Montana, showing its rounded, textured skull surface displayed against a dark background.
October 10, 2025 at 10:31 PM
Reposted by K.Kubo
witmerlab.bsky.social
Excited to see this new #OA article out on turtle head vasculature, led by @seishirotada.bsky.social. It was part of Sei's PhD diss. So much fun injection, dissection, sawing, & µCT of turtles & lizards in the lab with Sei and DJ Morgan—leading to this really nice article! doi.org/10.1186/s133... 🐢
Seishiro Tada dissects a snapping turtle head that previously had been injected and then microCT scanned. DJ Morgan (left) and Sei Tada (right) use the band saw to sagittally section a loggerhead sea turtle head. 3D volumetric rendering of a green sea turtle head (OUVC 11893) that had been injected with a barium-latex medium to visualize the vascular system. New research article out today! https://doi.org/10.1186/s13358-025-00403-3
October 7, 2025 at 7:27 PM
Reposted by K.Kubo
seishirotada.bsky.social
We have a new paper out! Turtle ancestors evolved a shell—but what else? We found that an unique rostral vasculature was also obtained gradually along the lineage, and that one of the earliest turtles Proganochelys likely retained a mostly ancestral state!🐢 sjpp.springeropen.com/articles/10....
October 7, 2025 at 9:02 AM
Reposted by K.Kubo
doublebeam.bsky.social
#ZAVACEPHALE IS FINALLY OUT! 🥳 Our first definitive Early Cretaceous pachycephalosaur! (~15 my older than the previous oldest pachycephalosaurs) And the first hand material for the clade! I can't tell y'all how much of a pleasure it was to review this paper! ☺️
September 17, 2025 at 7:30 PM
kkubo.bsky.social
友人の作ったオリジナル手帳のリフィルを交換。一年ぐらい使い続けて、皮の質感がちょっとずつ変化してきてる。

あとは靴を新調。このこも使いまくって、ちょっとずつ育ててく
September 27, 2025 at 11:27 AM
Reposted by K.Kubo
jessicalwarelab.bsky.social
Join us! We are hiring a new #curator at the #AMNH in #Vertebrate #Zoology careers.amnh.org/postings/4600 #academicjobs #tenuretrack
Assistant Curator, Vertebrate Zoology
The Division of Vertebrate Zoology at the American Museum of Natural History (AMNH) seeks an Assistant Curator in either the Department of Ornithology, Ichthyology, or Mammalogy to start on or after J...
careers.amnh.org
September 26, 2025 at 6:57 PM
Reposted by K.Kubo
witmerlab.bsky.social
Excited to be in Fukui, Japan, for the 6th International Symposium on Asian Dinosaurs #ISAD2025 which starts today. Fukui is a dinosaur town (my kind of town!), with life-size robotic dinosaurs around town! 🦖
September 25, 2025 at 11:40 PM
Reposted by K.Kubo
draliceclement.bsky.social
New paper out yesterday "New specimens of the arthrodire Bullerichthys fascidens Dennis and Miles 1980 show incipient site-specific osteichthyan-like tooth addition and resorption"

Read it now in Swiss Journal of Palaeontology: sjpp.springeropen.com/articles/10....
New specimens of the arthrodire Bullerichthys fascidens Dennis and Miles 1980 show incipient site-specific osteichthyan-like tooth addition and resorption - Swiss Journal of Palaeontology
The arthrodiran placoderm Bullerichthys fascidens, from the Late Devonian Gogo Formation, Western Australia, was originally described from an incomplete headshield with only the spinal and interolater...
sjpp.springeropen.com
September 23, 2025 at 4:12 AM
Reposted by K.Kubo
armanafzadeh.bsky.social
An exciting update on the human joint side – we found that lateral patellar tracking and malalignment are correlated with progressive cartilage damage, and that the 3D metrics we've been developing to describe PF morphology can be used to quantify the risk.

journals.sagepub.com/doi/10.1177/...
September 19, 2025 at 2:50 PM
Reposted by K.Kubo
peterfalkingham.com
Major update to Open Source photogrammetry software Meshroom

Meshroom has for some time been one of my top choices for open-source or free photogrammetry software, offering a really deep amount of customization and tinkering. However, while this blog made a big splash early on reviewing all the…
Major update to Open Source photogrammetry software Meshroom
Meshroom has for some time been one of my top choices for open-source or free photogrammetry software, offering a really deep amount of customization and tinkering. However, while this blog made a big splash early on reviewing all the different open-source photogrammetry software, I've found they haven't really kept up with Metashape or RealityScan, and I'm just not using them much any more.
peterfalkingham.com
September 19, 2025 at 3:10 PM
Reposted by K.Kubo
macroecoevoale.bsky.social
With a pristine skull, tiny phalanges, gastroliths, & an articulated tail, Zavacephale is the oldest & most complete pachycephalosaur ever found #fossilfriday I had the pleasure of photographing it last week, what a beauty! Congrats to the authors, read about it here: www.nature.com/articles/s41...
September 19, 2025 at 7:09 AM
Reposted by K.Kubo
witmerlab.bsky.social
Shaken to hear Mark Norell passed—good friend, trusted colleague, giant in our field. Coincidentally, I got the news as I was working on my talk for the Intl. Symp. on Asian Dinosaurs in Fukui later this month. Here's my slide on Mark’s impact on Asian dinosaur science. It hurt to add 1957–2025. 😥
September 9, 2025 at 4:47 PM