K.Kubo
@kkubo.bsky.social
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/
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/
Reposted by K.Kubo
東ゴビ盆地の白亜紀後期初期の地層内に保存された長期にわたる大陸間乾燥化
白亜紀後期初めバインシレ層について、堆積学的・同位体比解析アプローチにより古環境を復元
一貫した乾燥化ではなく、下部：広大なエルグ（砂丘）が卓越 上部：成熟した氾濫原
これまでバインシレ層上部と誤認されていた赤色層シーケンスは、ジャヴクラント層（旧称ジャドフタ層またはバルンゴヨト層）として再定義
バヤンシリー層とジャヴクラント層において、エルグ、氾濫原、交代古土壌という3つの連続した環境相を経た気候変遷の証拠を示す
論文OA onlinelibrary.wiley.com/doi/10.1111/...
白亜紀後期初めバインシレ層について、堆積学的・同位体比解析アプローチにより古環境を復元
一貫した乾燥化ではなく、下部：広大なエルグ（砂丘）が卓越 上部：成熟した氾濫原
これまでバインシレ層上部と誤認されていた赤色層シーケンスは、ジャヴクラント層（旧称ジャドフタ層またはバルンゴヨト層）として再定義
バヤンシリー層とジャヴクラント層において、エルグ、氾濫原、交代古土壌という3つの連続した環境相を経た気候変遷の証拠を示す
論文OA onlinelibrary.wiley.com/doi/10.1111/...
onlinelibrary.wiley.com
November 18, 2025 at 12:31 PM
東ゴビ盆地の白亜紀後期初期の地層内に保存された長期にわたる大陸間乾燥化
白亜紀後期初めバインシレ層について、堆積学的・同位体比解析アプローチにより古環境を復元
一貫した乾燥化ではなく、下部：広大なエルグ（砂丘）が卓越 上部：成熟した氾濫原
これまでバインシレ層上部と誤認されていた赤色層シーケンスは、ジャヴクラント層（旧称ジャドフタ層またはバルンゴヨト層）として再定義
バヤンシリー層とジャヴクラント層において、エルグ、氾濫原、交代古土壌という3つの連続した環境相を経た気候変遷の証拠を示す
論文OA onlinelibrary.wiley.com/doi/10.1111/...
白亜紀後期初めバインシレ層について、堆積学的・同位体比解析アプローチにより古環境を復元
一貫した乾燥化ではなく、下部：広大なエルグ（砂丘）が卓越 上部：成熟した氾濫原
これまでバインシレ層上部と誤認されていた赤色層シーケンスは、ジャヴクラント層（旧称ジャドフタ層またはバルンゴヨト層）として再定義
バヤンシリー層とジャヴクラント層において、エルグ、氾濫原、交代古土壌という3つの連続した環境相を経た気候変遷の証拠を示す
論文OA onlinelibrary.wiley.com/doi/10.1111/...
Reposted by K.Kubo
Our new MADEx team paper is out now in Sedimentology: we refine the geology & paleoenvironment of Mongolia’s Bayanshiree Fm, home to iconic taxa like Segnosaurus & Garudimimus: a 95.5-89.6 Ma age places this rich paleobiota at the acme of the Cretaceous Thermal Maximum! 🏜️🦕🌡
🔗 doi.org/10.1111/sed....
🔗 doi.org/10.1111/sed....
November 18, 2025 at 10:48 AM
Our new MADEx team paper is out now in Sedimentology: we refine the geology & paleoenvironment of Mongolia’s Bayanshiree Fm, home to iconic taxa like Segnosaurus & Garudimimus: a 95.5-89.6 Ma age places this rich paleobiota at the acme of the Cretaceous Thermal Maximum! 🏜️🦕🌡
🔗 doi.org/10.1111/sed....
🔗 doi.org/10.1111/sed....
Reposted by K.Kubo
#SVP2025 was finally an opportunity to show the excellent reconstructions of Dysalotosaurus created by @dragonsofwales.bsky.social
November 15, 2025 at 7:56 PM
#SVP2025 was finally an opportunity to show the excellent reconstructions of Dysalotosaurus created by @dragonsofwales.bsky.social
Reposted by K.Kubo
#2025SVP For people who missed my talk: I’m happy to give this or longer versions via zoom/in person for your seminars/colloquiums. Being based at a small museum w/ little daily exchange among peers, it’s a great opportunity for me to stay connected & for you to learn about our shelled overlords.
#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.
November 16, 2025 at 9:06 AM
#2025SVP For people who missed my talk: I’m happy to give this or longer versions via zoom/in person for your seminars/colloquiums. Being based at a small museum w/ little daily exchange among peers, it’s a great opportunity for me to stay connected & for you to learn about our shelled overlords.
Reposted by K.Kubo
Join us in Sheffield! We are keen to support early career researchers in applying for independent research fellowships (IRFs) to join our friendly and collaborative environment, in areas related to developmental biology, stem cells and regenerative biology, and neuroscience.
November 12, 2025 at 10:16 AM
Join us in Sheffield! We are keen to support early career researchers in applying for independent research fellowships (IRFs) to join our friendly and collaborative environment, in areas related to developmental biology, stem cells and regenerative biology, and neuroscience.
#FossilFriday
Embryonic and juvenile specimens of tyrannosaurid lower jaws (Daspletosaurus) in MOR!
Embryonic and juvenile specimens of tyrannosaurid lower jaws (Daspletosaurus) in MOR!
November 14, 2025 at 12:05 PM
#FossilFriday
Embryonic and juvenile specimens of tyrannosaurid lower jaws (Daspletosaurus) in MOR!
Embryonic and juvenile specimens of tyrannosaurid lower jaws (Daspletosaurus) in MOR!
Reposted by K.Kubo
I’m currently at SVP in Birmingham! On the final day, in the skull symposium, I’ll be giving a talk showing that the mammalian face is an evolutionary novelty that arose by overriding the ancestral jaw framework — and that the mammalian premaxilla is the septomaxilla. #SVP2025 #2025SVP
November 13, 2025 at 12:01 PM
Reposted by K.Kubo
恐竜卵殻から年代を知る新手法
卵殻中の方解石に含まれる微量のウラン・鉛を測定
北米西部内陸盆地から回収された恐竜の卵化石を直接年代測定したところ、灰層を挟む高精度年代の5%以内の誤差で年代測定
ゴビ白亜紀後期の恐竜卵殻年代を初測定
地球化学データと微量元素マッピングを組み合わせた結果、非鳥類型恐竜の卵殻は堆積物との接触を通じてウラン（U）を初期に吸収していたことが示され、これは第四紀の鳥類卵の知見と一致
ニュース www.su.ac.za/en/faculties...
論文OA www.nature.com/articles/s43...
卵殻中の方解石に含まれる微量のウラン・鉛を測定
北米西部内陸盆地から回収された恐竜の卵化石を直接年代測定したところ、灰層を挟む高精度年代の5%以内の誤差で年代測定
ゴビ白亜紀後期の恐竜卵殻年代を初測定
地球化学データと微量元素マッピングを組み合わせた結果、非鳥類型恐竜の卵殻は堆積物との接触を通じてウラン（U）を初期に吸収していたことが示され、これは第四紀の鳥類卵の知見と一致
ニュース www.su.ac.za/en/faculties...
論文OA www.nature.com/articles/s43...
Dinosaur eggshells unlock a new way to tell time in the fossil record
Novel method developed to date fossilized dinosaur eggshells. Regarded as a breakthrough to date the age of fossil-bearing rocks.
www.su.ac.za
November 11, 2025 at 9:55 PM
恐竜卵殻から年代を知る新手法
卵殻中の方解石に含まれる微量のウラン・鉛を測定
北米西部内陸盆地から回収された恐竜の卵化石を直接年代測定したところ、灰層を挟む高精度年代の5%以内の誤差で年代測定
ゴビ白亜紀後期の恐竜卵殻年代を初測定
地球化学データと微量元素マッピングを組み合わせた結果、非鳥類型恐竜の卵殻は堆積物との接触を通じてウラン（U）を初期に吸収していたことが示され、これは第四紀の鳥類卵の知見と一致
ニュース www.su.ac.za/en/faculties...
論文OA www.nature.com/articles/s43...
卵殻中の方解石に含まれる微量のウラン・鉛を測定
北米西部内陸盆地から回収された恐竜の卵化石を直接年代測定したところ、灰層を挟む高精度年代の5%以内の誤差で年代測定
ゴビ白亜紀後期の恐竜卵殻年代を初測定
地球化学データと微量元素マッピングを組み合わせた結果、非鳥類型恐竜の卵殻は堆積物との接触を通じてウラン（U）を初期に吸収していたことが示され、これは第四紀の鳥類卵の知見と一致
ニュース www.su.ac.za/en/faculties...
論文OA www.nature.com/articles/s43...
Reposted by K.Kubo
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
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...
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
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
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
アメリカ自然史博物館に、セントラルパーク
Reposted by K.Kubo
#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.
November 5, 2025 at 11:25 AM
#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.
Reposted by K.Kubo
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
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.
Reposted by K.Kubo
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 🦖
October 30, 2025 at 9:43 PM
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 🦖
First trip for collection visits in MOR and AMNH!
October 31, 2025 at 10:16 PM
First trip for collection visits in MOR and AMNH!
Reposted by K.Kubo
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!
October 31, 2025 at 6:51 PM
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!
Reposted by K.Kubo
New skull material of the early therizinosaurian dinosaur Falcarius: anatomypubs.onlinelibrary.wiley.com/doi/10.1002/... 🧪 (📷 @freewillie643.bsky.social & Zanno)
October 25, 2025 at 4:49 PM
New skull material of the early therizinosaurian dinosaur Falcarius: anatomypubs.onlinelibrary.wiley.com/doi/10.1002/... 🧪 (📷 @freewillie643.bsky.social & Zanno)
Reposted by K.Kubo
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! 💻📊📈🦐🦪🦣🐚🪸🦕🦖🐋🐊🐟🦑🐢🐍🦎🐦⬛🦂
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
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! 💻📊📈🦐🦪🦣🐚🪸🦕🦖🐋🐊🐟🦑🐢🐍🦎🐦⬛🦂
Hope it helps! 💻📊📈🦐🦪🦣🐚🪸🦕🦖🐋🐊🐟🦑🐢🐍🦎🐦⬛🦂
Reposted by K.Kubo
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/...
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
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/...
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/...
Reposted by K.Kubo
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） 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
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） www.hokudai.ac.jp/news/2025/10...
Reposted by K.Kubo
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
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...
Reposted by K.Kubo
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.
October 10, 2025 at 10:31 PM
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.
Reposted by K.Kubo
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... 🐢
October 7, 2025 at 7:27 PM
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... 🐢
Reposted by K.Kubo
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
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....