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Yoshitsugu Kobayashi
Hokkaido University
64Publications
15H-index
634Citations
Publications 64
Newest
#1Ryuji Takasaki (Hokkaido University)H-Index: 2
#2Anthony R. Fiorillo (Perot Museum of Nature and Science)H-Index: 19
Last.Paul J. McCarthy (UAF: University of Alaska Fairbanks)H-Index: 16
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The Prince Creek Formation of Alaska, a rock unit that represents lower coastal plain and delta deposits, is one of the most important formations in the world for understanding vertebrate ecology in the Arctic during the Cretaceous. Here we report on an isolated cranial material, supraoccipital, of a lambeosaurine hadrosaurid from the Liscomb Bonebed of the Prince Creek Formation. The lambeosaurine supraoccipital has well-developed squamosal bosses and a short sutural surface with the exoccipita...
#1Yoshitsugu Kobayashi (Hokkaido University)H-Index: 15
#2Tomohiro NishimuraH-Index: 11
Last.Kazuhiko SakuraiH-Index: 1
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A nearly complete skeleton of a new hadrosaurid, Kamuysaurus japonicus gen. et sp. nov., was discovered from the outer shelf deposits of the Upper Cretaceous Hakobuchi Formation of the Yezo Group in Hobetsu area of Mukawa town in Hokkaido, Japan. Kamuysaurus belongs to the sub-clade of Hadrosaurinae, Edmontosaurini, and forms a monophyly with Laiyangosaurus and Kerberosaurus from the northern Far East. Kamuysaurus has a long anterior platform for the nasofrontal sutural surface, which may indica...
#1Yuong-Nam Lee (SNU: Seoul National University)H-Index: 14
#2Hang-Jae Lee (Geological Museum)H-Index: 5
Last.Khishigjav Tsogtbaatar (Mongolian Academy of Sciences)H-Index: 11
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Abstract Crocodyliform tracks are reported from the Upper Cretaceous (?Cenomanian-Santonian) Bayanshiree Formation in southeastern Mongolia. Ten tracks are preserved as natural casts, forming a trackway with a quadrupedal gait pattern with a tail trail. All tracks are short and wide, and dominated by toe traces without plantar impressions. Pes tracks are characterized by four deep claw impressions and push-back marks behind them. Manus tracks have shallow claw marks and long, sub-parallel scratc...
#1Anthony R. Fiorillo (Perot Museum of Nature and Science)H-Index: 19
#2Paul J. McCarthy (UAF: University of Alaska Fairbanks)H-Index: 16
Last.Christopher R. Noto (University of Wisconsin–Parkside)H-Index: 4
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We report details of a unique association of hadrosaur and therizinosaur tracks found in the Late Cretaceous lower Cantwell Formation, Denali National Park, central Alaska Range, Alaska. This rock unit is now well-documented as a source of thousands of fossil footprints of vertebrates such as fishes, pterosaurs, and avialan and non-avialan dinosaurs. The lower Cantwell Formation in this area consists of numerous fining-upward successions of conglomerates and pebbly sandstones, cross-stratified a...
#1Kohei Tanaka (Japan Society for the Promotion of Science)H-Index: 1
#2Darla K. Zelenitsky (U of C: University of Calgary)H-Index: 15
Last.Yoshitsugu Kobayashi (Hokkaido University)H-Index: 15
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Dinosaurs thrived and reproduced in various regions worldwide, including the Arctic. In order to understand their nesting in diverse or extreme environments, the relationships between nests, nesting environments, and incubation methods in extant archosaurs were investigated. Statistical analyses reveal that species of extant covered nesters (i.e., crocodylians and megapodes) preferentially select specific sediments/substrates as a function of their nesting style and incubation heat sources. Rela...
#1Ryuji Takasaki (Hokkaido University)H-Index: 2
#2Kentaro Chiba (U of T: University of Toronto)H-Index: 2
Last.Anthony R. Fiorillo (Perot Museum of Nature and Science)H-Index: 19
view all 5 authors...
AbstractNipponosaurus sachalinensis is the only definitive lambeosaurine hadrosaurid from Sakhalin Island of Russia. Previous studies suggested it was a member of Lambeosaurini (derived lambeosaurines). However, its phylogenetic status within Lambeosaurini remains controversial. In addition, some studies argued the juvenile ontogenetic stage of the holotype and regarded Nipponosaurus as an invalid taxon. In order to solve these problems, its definite growth stage is determined through histologic...
#1Tomonori Tanaka (Hokkaido University)H-Index: 2
#2Yoshitsugu Kobayashi (Hokkaido University)H-Index: 15
Last.Manabu KanoH-Index: 1
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Asian hesperornithiforms are extremely rare in contrast to the much more abundant record from North America. In Asia, these fossil birds are only known from fragmentary materials from Mongolia. Here we describe the skeletal remains of a new hesperornithiform Chupkaornis keraorum gen. et sp. nov. from the Upper Cretaceous Kashima Formation (Coniacian to Santonian) of the Yezo Group in Mikasa City, Hokkaido, Japan. This is the best-preserved hesperornithiform material from Asia and it is the first...
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