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Birds have paedomorphic dinosaur skulls
The interplay of evolution and development has been at the heart of evolutionary theory for more than a century. Heterochrony—change in the timing or rate of developmental events—has been implicatedExpand
A transitional snake from the Late Cretaceous period of North America
Snakes are the most diverse group of lizards, but their origins and early evolution remain poorly understood owing to a lack of transitional forms. Several major issues remain outstanding, such asExpand
Transitional fossils and the origin of turtles
The origin of turtles is one of the most contentious issues in systematics with three currently viable hypotheses: turtles as the extant sister to (i) the crocodile–bird clade, (ii) theExpand
New information on the braincase and inner ear of Euparkeria capensis Broom: implications for diapsid and archosaur evolution
Since its discovery, Euparkeria capensis has been a key taxon for understanding the early evolution of archosaurs. The braincase of Euparkeria was described based on a single specimen, but muchExpand
Earliest African Record of the Varanus Stem-Clade (Squamata: Varanidae) from the Early Oligocene of Egypt
KRISTER T. SMITH,",* BHART-ANJAN S. BHULLAR,2't and PATRICIA A. HOLROYD3; 1Vertebrate Paleontology Lab, J. J. Pickle Research Campus, 10100 Burnet Rd. Bldg. 6, The University of Texas, Austin,Expand
Mass extinction of lizards and snakes at the Cretaceous–Paleogene boundary
The Cretaceous–Paleogene (K-Pg) boundary is marked by a major mass extinction, yet this event is thought to have had little effect on the diversity of lizards and snakes (Squamata). A revision ofExpand
Structure of the Nasal Region of Non-Mammalian Cynodonts and Mammaliaforms: Speculations on the Evolution of Mammalian Endothermy
ABSTRACT Nasal regions of the non-mammalian cynodonts Massetognathus, Probainognathus, and Elliotherium were reconstructed from micro-computed tomography scans and compared with scans and publishedExpand
Evolutionary origin of the turtle skull
Transitional fossils informing the origin of turtles are among the most sought-after discoveries in palaeontology. Despite strong genomic evidence indicating that turtles evolved from within theExpand
Complete Ichthyornis skull illuminates mosaic assembly of the avian head
The skull of living birds is greatly modified from the condition found in their dinosaurian antecedents. Bird skulls have an enlarged, toothless premaxillary beak and an intricate kinetic system thatExpand
Synchrotron imaging of dentition provides insights into the biology of Hesperornis and Ichthyornis, the “last” toothed birds
BackgroundThe dentitions of extinct organisms can provide pivotal information regarding their phylogenetic position, as well as paleobiology, diet, development, and growth. Extant birds areExpand