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Predatory Dinosaurs from the Sahara and Late Cretaceous Faunal Differentiation
Late Cretaceous (Cenomanian) fossils discovered in the Kem Kem region of Morocco include large predatory dinosaurs that inhabited Africa as it drifted into geographic isolation. One, represented by a
The Giant Crocodyliform Sarcosuchus from the Cretaceous of Africa
New fossils of the giant African crocodyliform Sarcosuchus imperator clarify its skeletal anatomy, growth patterns, size, longevity, and phylogenetic position. The skull has an expansive narial bulla
Ecologically distinct dinosaurian sister group shows early diversification of Ornithodira
TLDR
The analysis suggests that the dentition and diet of silesaurids, ornithischians and sauropodomorphs evolved independently from a plesiomorphic carnivorous form, and Asilisaurus demonstrates the antiquity of both Ornithodira and the dinosaurian lineage.
The earliest bird-line archosaurs and the assembly of the dinosaur body plan.
TLDR
It is demonstrated that several anatomical features long thought to characterize Dinosauria and dinosauriforms evolved much earlier, soon after the bird-crocodylian split, and that the earliest avemetatarsalians retained the croc Codylian-like ankle morphology and hindlimb proportions of stem archosaurs and early pseudosuchians.
Cranial Anatomy of Ennatosaurus tecton (Synapsida: Caseidae) from the Middle Permian of Russia and the Evolutionary Relationships of Caseidae
TLDR
Phylogenetic analysis of Caseidae yields a single most parsimonious tree and its topology reveals that the pattern of dental complexity in terms of the number of apical cuspules is homoplasious, cautioning against its use as a unidirectional phylogenetic character.
A NEW NOTOSUCHIAN FROM THE EARLY CRETACEOUS OF NIGER
P. C. SERENO1, C. A. SIDOR2, H. C. E. LARSSON3, and B. GADO4 1Department of Organismal Biology and Anatomy, University of Chicago, Chicago, Illinois 60615, dinosaur@uchicago.edu; 2Department of
GHOST LINEAGES AND MAMMALNESS : ASSESSING THE TEMPORAL PATTERN OF CHARACTER ACQUISITION IN THE SYNAPSIDA
The origin of mammals has been characterized as a gradual process, a claim based pri- marily on a well-preserved series of extinct nonmammalian synapsids ("mammal-like reptiles") that span some 200
ELLIOTHERIUM KERSTENI, A NEW TRITHELEDONTID FROM THE LOWER ELLIOT FORMATION (UPPER TRIASSIC) OF SOUTH AFRICA
Abstract We describe a new tritheledontid, Elliotherium kersteni n. gen. and sp., on the basis of a partial skull collected from the lower Elliot Formation (Upper Triassic; Euskelosaurus Range Zone)
SIMPLIFICATION AS A TREND IN SYNAPSID CRANIAL EVOLUTION
  • C. Sidor
  • Environmental Science
    Evolution; international journal of organic…
  • 1 July 2001
TLDR
The results of a new skull simplification metric (SSM), which is defined as a function of the number of distinct elements, show that pronounced simplification is evident on both temporal and phylogenetic scales.
SIMPLIFICATION AS A TREND IN SYNAPSID CRANIAL EVOLUTION
  • C. Sidor
  • Environmental Science
    Evolution; international journal of organic…
  • 1 July 2001
TLDR
The results of a new skull simplification metric (SSM), which is defined as a function of the number of distinct elements, show that pronounced simplification is evident on both temporal and phylogenetic scales.
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