Tail-propelled aquatic locomotion in a theropod dinosaur

@article{Ibrahim2020TailpropelledAL,
  title={Tail-propelled aquatic locomotion in a theropod dinosaur},
  author={Nizar Ibrahim and Simone Maganuco and Cristiano Dal Sasso and Matteo Fabbri and Marco Auditore and Gabriele Bindellini and David M. Martill and Samir Zouhri and Diego A. Mattarelli and David M. Unwin and Jasmina Wiemann and Davide Bonadonna and Ayoub Amane and Juliana Jakubczak and Ulrich. Joger and George V. Lauder and Stephanie E. Pierce},
  journal={Nature},
  year={2020},
  volume={581},
  pages={67-70}
}
In recent decades, intensive research on non-avian dinosaurs has strongly suggested that these animals were restricted to terrestrial environments 1 . Historical proposals that some groups, such as sauropods and hadrosaurs, lived in aquatic environments 2 , 3 were abandoned decades ago 4 – 6 . It has recently been argued that at least some of the spinosaurids—an unusual group of large-bodied theropods of the Cretaceous era—were semi-aquatic 7 , 8 , but this idea has been challenged on… Expand
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References

SHOWING 1-10 OF 81 REFERENCES
Semiaquatic adaptations in a giant predatory dinosaur
TLDR
Adaptations for a semiaquatic lifestyle in the dinosaur Spinosaurus aegyptiacus are described, including retraction of the fleshy nostrils to a position near the mid-region of the skull and an elongate neck and trunk that shift the center of body mass anterior to the knee joint. Expand
Aquatic adaptation in the skull of carnivorous dinosaurs (Theropoda: Spinosauridae) and the evolution of aquatic habits in spinosaurids
TLDR
New spinosaurid specimens from the Kem Kem beds of Morocco reveal aquatic adaptations in the cranium, suggesting that the extinction of large crocodylomorphs was associated with the rise of dinosaurs as apex predators in the freshwater ecosystem in North Africa. Expand
Convergent Evolution of Jaws between Spinosaurid Dinosaurs and Pike Conger Eels
TLDR
A suite of craniodental characters unexpectedly shared by spinosaurs and pike conger eels are reported, providing an additional convincing argument regarding the decades-long and widely debated lifestyle of spinosaurs. Expand
Semi-aquatic adaptations in a spinosaur from the Lower Cretaceous of Brazil
Abstract Spinosaurinae are known to have a strong relationship with aquatic environments, involving several anatomical adaptations. Nonetheless, this group of theropods remains enigmatic, due to theExpand
Synchrotron scanning reveals amphibious ecomorphology in a new clade of bird-like dinosaurs
TLDR
This lineage adds an amphibious ecomorphology to those evolved by maniraptorans: it acquired a predatory mode that relied mainly on neck hyperelongation for food procurement, it coupled the obligatory bipedalism of theropods with forelimb proportions that may support a swimming function, and it developed postural adaptations convergent with short-tailed birds. Expand
Adaptive features of protoceratopoids (Ornithischia: Neoceratopsia)
The analysis of some morphological characteristics of protoceratopoid skeletons, the extent of mobility of the vertebral column, and the probable adaptive significance of these features suggest thatExpand
A buoyancy, balance and stability challenge to the hypothesis of a semi-aquatic Spinosaurus Stromer, 1915 (Dinosauria: Theropoda)
TLDR
The Spinosaurus model was found to be unsinkable, even with its lungs deflated by 75%, and this would greatly hinder a semi-aquatic, pursuit predator, but would still have been a competent terrestrial animal. Expand
The Taphonomy of a Centrosaurus (Ornithischia: Certopsidae) Bone Bed from the Dinosaur Park Formation (Upper Campanian), Alberta, Canada, with Comments on Cranial Ontogeny
Abstract Bone bed 43 is one of at least eight paucispecific Centrosaurus bone beds located in the Dinosaur Park Formation (Upper Campanian) in Dinosaur Provincial Park, Alberta, Canada. It long hasExpand
Kinematics and efficiency of steady swimming in adult axolotls (Ambystoma mexicanum)
  • Août, Aerts
  • Biology, Medicine
  • The Journal of experimental biology
  • 1997
TLDR
The kinematics of steady swimming at a wide range of velocities was analysed using high-speed video recordings of eight individuals of Ambystoma mexicanum, indicating that the fish swims less efficiently than do anuran tadpoles and most fishes. Expand
Comment on: Aquatic adaptation in the skull of carnivorous dinosaurs (Theropoda: Spinosauridae) and the evolution of aquatic habits in spinosaurids. 93: 275–284
TLDR
It is found that the presented traits of spinosaurine theropods were either loosely defined and/or are clearly distinct from those traits seen in extant animals with adaptations to life in water. Expand
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