Results 51 to 60 of about 226 (117)

A new abelisaurid dinosaur from the end Cretaceous of Patagonia and evolutionary rates among the Ceratosauria

open access: yesCladistics, Volume 40, Issue 3, Page 307-356, June 2024.
Abstract Gondwanan dinosaur faunae during the 20 Myr preceding the Cretaceous–Palaeogene (K/Pg) extinction included several lineages that were absent or poorly represented in Laurasian landmasses. Among these, the South American fossil record contains diverse abelisaurids, arguably the most successful groups of carnivorous dinosaurs from Gondwana in ...
Diego Pol   +5 more
wiley   +1 more source

Reclassification of ankylosaurs with ambiguous taxonomy using tooth morphometrics

open access: yesZoological Journal of the Linnean Society
Abstract New morphometric methods of analysis of phylliform ornithischian teeth provide the opportunity to study clade associations of ankylosaurs of ambiguous taxonomy that include dental material. With recent extensive sampling of ex situ/in situ dentition of ankylosaurs, we present new dental characters for phylogenetic analyses of
Emily G Cross   +3 more
openaire   +1 more source

Comparative cranial biomechanics reveal that Late Cretaceous tyrannosaurids exerted relatively greater bite force than in early‐diverging tyrannosauroids

open access: yesThe Anatomical Record, Volume 307, Issue 5, Page 1897-1917, May 2024.
Abstract Tyrannosaurus has been an exemplar organism in feeding biomechanical analyses. An adult Tyrannosaurus could exert a bone‐splintering bite force, through expanded jaw muscles and a robust skull and teeth. While feeding function of adult Tyrannosaurus has been thoroughly studied, such analyses have yet to expand to other tyrannosauroids ...
Evan Johnson‐Ransom   +7 more
wiley   +1 more source

Patterns of variation in fleshy diaspore size and abundance from Late Triassic–Oligocene

open access: yesBiological Reviews, Volume 99, Issue 2, Page 430-457, April 2024.
ABSTRACT Vertebrate‐mediated seed dispersal is a common attribute of many living plants, and variation in the size and abundance of fleshy diaspores is influenced by regional climate and by the nature of vertebrate seed dispersers among present‐day floras.
Duhita Naware, Roger Benson
wiley   +1 more source

Endoscopic Features of Eosinophilic Esophagitis: From Its Origins to Current Practice and Innovations. Literature Review and Personal Experience

open access: yesРоссийский журнал гастроэнтерологии, гепатологии, колопроктологии
Aim: to systematize literature data and the authors’ own findings regarding the endoscopic features of eosinophilic esophagitis.Key points. Eosinophilic esophagitis is a chronic inflammatory disease of the esophagus characterized by marked eosinophilic ...
E. D. Fedorov   +6 more
doaj   +1 more source

Notes on Ceratopsians and Ankylosaurs at the Royal Ontario Museum

open access: yes, 2012
As part of my dissertation research and general research program focused on horned dinosaurs, I traveled to the Royal Ontario Museum (ROM, Toronto, Ontario, Canada) in the summer of 2006 for a few days of research. The notes were typed in Microsoft Word, and are presented in unedited format on the following pages.
openaire   +1 more source

A “bloat-and-float” taphonomic model best explains the upside-down preservation of ankylosaurs

open access: yesPalaeogeography, Palaeoclimatology, Palaeoecology, 2018
Abstract It is widely held that, within the Cretaceous fluvial and marine deposits of North America, ankylosaur remains are typically preserved upside-down; however, this anecdotal observation has yet to be substantiated. Likewise, none of the various hypotheses that purport to explain the frequent occurrence of overturned ankylosaurs has been tested
Jordan C. Mallon   +3 more
openaire   +1 more source

An ankylosaur (Ornithischia: Reptilia) from the Lower Cretaceous of southern Queensland

open access: yes, 1980
(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
openaire   +2 more sources

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