Zobrazeno 1 - 10
of 110
pro vyhledávání: '"David J. Varricchio"'
Autor:
Sara E. Oser, Karen Chin, Joseph J. W. Sertich, David J. Varricchio, Seung Choi, Jeffrey Rifkin
Publikováno v:
Scientific Reports, Vol 11, Iss 1, Pp 1-15 (2021)
Abstract A new Cretaceous ootaxon (eggshell type) from the Kaiparowits Formation of Grand Staircase-Escalante National Monument is among a growing number of very small eggs described from the Mesozoic. Analyses of two partial eggs (~ 17.7 mm in diame
Externí odkaz:
https://doaj.org/article/a906b911855e4a198743e996ba20ed95
Autor:
Nizar Ibrahim, Paul C. Sereno, David J. Varricchio, David M. Martill, Didier B. Dutheil, David M. Unwin, Lahssen Baidder, Hans C. E. Larsson, Samir Zouhri, Abdelhadi Kaoukaya
Publikováno v:
ZooKeys, Vol 928, Iss , Pp 1-216 (2020)
The geological and paleoenvironmental setting and the vertebrate taxonomy of the fossiliferous, Cenomanian-age deltaic sediments in eastern Morocco, generally referred to as the “Kem Kem beds”, are reviewed. These strata are recognized here as th
Externí odkaz:
https://doaj.org/article/518f833dcb8e468cb4515f9331fbecd5
Publikováno v:
eLife, Vol 12 (2023)
The avian palaeognath phylogeny has been recently revised significantly due to the advancement of genome-wide comparative analyses and provides the opportunity to trace the evolution of the microstructure and crystallography of modern dinosaur eggshe
Externí odkaz:
https://doaj.org/article/7dea13d31c8f4787875c7d2c0c1d6ff7
Publikováno v:
Historical Biology. :1-13
Hadrosauriformes is a group of ornithopod dinosaurs with a rich and extensive Cretaceous track record. However, their rear foot (pes) anatomy is rather conservative. Thus, distinguishing different putative track producers from morphological differenc
Publikováno v:
Historical Biology. :1-24
Autor:
Mark A. Norell, Jasmina Wiemann, Iris Menéndez, Matteo Fabbri, Congyu Yu, Claudia A. Marsicano, Anita Moore-Nall, David J. Varricchio, Diego Pol, Darla K. Zelenitsky
Publikováno v:
Nature. 610:E11-E14
In the accompanying Comment, Choi et al. dispute morphological, histological, geochemical and biomechanical evidence for a soft-shelled egg in Mussaurus, an Early Jurassic sauropodomorph, based on three main assertions, namely that: (1) the carbonate
Publikováno v:
Journal of the Arizona-Nevada Academy of Science. 50
Publikováno v:
PALAIOS. 36:283-300
The terrestrial feeding trace Edaphichnium lumbricatum is known from the Triassic to the Pleistocene and is characterized by tubular burrows with ellipsoidal fecal pellets, indicating substrate feeding by earthworms or other invertebrates. We describ
Publikováno v:
Canadian Journal of Earth Sciences. 58:796-811
Dale Russell described the osteology, morphology, and ecology of the small theropod “Stenonychosaurus inequalis” in two papers, speculating on its life habits, brain power, vision, movement, feeding, and hand capabilities. Russell even pondered a