A new neoceratopsian (Ornithischia, Ceratopsia) from the Lower Cretaceous Ohyamashimo Formation (Albian), southwestern Japan DOI Open Access
Tomonori Tanaka, Kentaro Chiba, Tadahiro Ikeda

et al.

Papers in Palaeontology, Journal Year: 2024, Volume and Issue: 10(5)

Published: Sept. 1, 2024

Abstract The herbivorous dinosaur clade Ceratopsia flourished in the northern hemisphere during Late Jurassic to Cretaceous. Previous palaeobiogeographic studies have suggested that their initial diversification occurred Asia, with early‐branching neoceratopsians extending geographical range North America sometime Barremian Albian. However, specific timing and mode of dispersal from Asia remains unknown. Here we describe a new, neoceratopsian, Sasayamagnomus saegusai gen. et sp. nov., Albian Ohyamashimo Formation southwestern Japan, representing easternmost fossil record ceratopsians Asia. exhibits three diagnostic features jugal, squamosal coracoid, respectively, also has unique combination characters lacrimal. Our phylogenetic analysis indicates forms Aquilops americanus , one earliest America, followed by sister taxon Auroraceratops rugosus China. present time‐calibrated tree immigration latest Aptian or early Albian, refining previously timeframe. This aligns fragmentary neoceratopsian records Lower Cretaceous formation Bering land bridge. Furthermore, simultaneous occurrence global warming (which enabled development extensive forests Arctic region) emergence bridge Aptian–Albian, probably played crucial role facilitating America.

Language: Английский

A new neoceratopsian (Ornithischia, Ceratopsia) from the Lower Cretaceous Ohyamashimo Formation (Albian), southwestern Japan DOI Open Access
Tomonori Tanaka, Kentaro Chiba, Tadahiro Ikeda

et al.

Papers in Palaeontology, Journal Year: 2024, Volume and Issue: 10(5)

Published: Sept. 1, 2024

Abstract The herbivorous dinosaur clade Ceratopsia flourished in the northern hemisphere during Late Jurassic to Cretaceous. Previous palaeobiogeographic studies have suggested that their initial diversification occurred Asia, with early‐branching neoceratopsians extending geographical range North America sometime Barremian Albian. However, specific timing and mode of dispersal from Asia remains unknown. Here we describe a new, neoceratopsian, Sasayamagnomus saegusai gen. et sp. nov., Albian Ohyamashimo Formation southwestern Japan, representing easternmost fossil record ceratopsians Asia. exhibits three diagnostic features jugal, squamosal coracoid, respectively, also has unique combination characters lacrimal. Our phylogenetic analysis indicates forms Aquilops americanus , one earliest America, followed by sister taxon Auroraceratops rugosus China. present time‐calibrated tree immigration latest Aptian or early Albian, refining previously timeframe. This aligns fragmentary neoceratopsian records Lower Cretaceous formation Bering land bridge. Furthermore, simultaneous occurrence global warming (which enabled development extensive forests Arctic region) emergence bridge Aptian–Albian, probably played crucial role facilitating America.

Language: Английский

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