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The evolution of the pedal morphology and the ontogeny of early oviraptorosaur theropods remain inadequately understood, largely owing to the poor preservation of available material and the limitation...

The evolution of the pedal morphology and the ontogeny of early oviraptorosaur theropods remain inadequately understood, largely owing to the poor preservation of available material and the limitation...

Recent decades have witnessed an unprecedented rise in avian fossil discoveries that directly inform our understanding of bird origins and evolution, the stepwise assemblage of the avian body plan,...

Cephalopod paleobiology and evolution: new insights, rising problems, and perspectives

It is widely assumed that the first placental mammals were solitary. Here, we tested this assumption and which ecological and life history factors ...

Snake embryos coil, but how and why they corkscrew remains unexplored. Weber et al. find that the embryos wind up clockwise via buckling of the rapidly elongating axial body against the slow-growing, ...

Abstract. The lower carnassial tooth (m1) is a key innovation underlying the ecological diversification of Carnivora. However, their exceptionally diverse

The North American thescelosaurine ornithischian Fona herzogae (Cenomanian Mussentuchit Member of the Cedar Mountain Formation) is represented by one of the largest samples of isolated cranial element...

Lungfishes are commonly considered to be the sister group to tetrapods. They appeared around 415 million years ago, then rapidly evolved, diversified and spread. Although many morphological characteri...

Abstract. Vertebrates have varied body size distributions. Among these, non-avian dinosaurs have uniquely large minimum and maximum sizes, but the reasons

Dinosaurs are famous for being big, from the towering Tyrannosaurus rex to the colossal Apatosaurus. But a new study suggests that one of the greatest mysteries of dinosaur evolution isn’t ...

定評あるVERTEBRATE PALAEONTOLOGY 5th ed.を3分冊で全訳．オールカラー．最新の古生物学・進化発生学の知見を取り入れ，脊椎動物の進化史の全体像を把握．第I巻では起源からペルム紀-三畳紀大量絶滅まで解説．［内容］脊椎動物の誕生／化石脊椎動物の研究法／初期古生代の魚類／初期四肢動物／初期有羊膜類の進化

Abstract. Mesozoic ecosystems differed from the present in the abundance of large-bodied herbivores that grew through several feeding envelopes, raising th

A reconstruction of the evolutionary history of passerine body plans over the past ~50 Myr shows rare bursts of phenotypic innovation near the origin of major taxonomic groups that are temporally alig...

The metacarpals of sauropod dinosaurs were arranged to form a tube or semi-tube, and those of stegosaurs were arranged to form a semi-tube. This orientation aimed the fingers toward each other duri...

Gastrolith shape as an indicator of digestive function and its implications for dinosaurian digestive strategies

Abstract. Birds and mammals mostly produce clutches with small numbers of large individual offspring compared to non-bird reptiles, including dinosaurs on

The Triassic was a unique time for beak evolution, as seen in a wide diversity of terrestrial tetrapods. Beaks were present in dicynodont synapsid survivors of the Permo-Triassic mass extinction even...

Complex axial skeletal morphology has evolved in mammals and some reptiles. Here the authors combine morphometrics with a maximum likelihood model to find that axial heterogeneity is associated with b...

Archosauromorphs are a diverse clade of vertebrates that originated in the Early Triassic and persist today as crown birds (ornithodirans) and crocodi…