The Complete Skull and Skeleton of an Early Dinosaur

  title={The Complete Skull and Skeleton of an Early Dinosaur},
  author={Paul C. Sereno and Fernando E Novas},
  pages={1137 - 1140}
The unearthing of a complete skull and skeleton of the early dinosaur Herrerasaurus ischigualastensis sheds light on the early evolution of dinosaurs. Discovered in the Upper Triassic Ischigualasto Formation of Argentina, the fossils show that Herrerasaurus, a primitive theropod, was an agile, bipedal predator with a short forelimb specialized for grasping and raking. The fossils clarify anatomical features of the common ancestor of all dinosaurs. Herrerasaurus and younger dinosaurs from Upper… 

Primitive dinosaur skeleton from Argentina and the early evolution of Dinosauria

The discovery of Eoraptor supports the hypothesis that dinosaurs diverged rapidly at small body size from a common ancestor, with the principal herbivorous and carnivorous lineages present by the middle Carnian.

The skull and neck of the basal theropod Herrerasaurus ischigualastensis

The skull of Herrerasaurus ischigualastensis has a rectangular profile and a transversely narrow snout and other features of the skull constitute dinosaurian synapomorphies, such as the loss of the postfrontal and small post-temporal opening.


  • J. Dzik
  • Environmental Science, Geography
  • 2003
Abstract An accumulation of skeletons of the pre-dinosaur Silesaurus opolensis, gen. et sp. nov. is described from the Keuper (Late Triassic) claystone of Krasiejów in southern Poland. The strata are

Basal Dinosauriform Remains from Britain and the Diagnosis of the Dinosauria

The definition and diagnosis of the Dinosauria are restated and the positions of the new form, herrerasaurs and Eoraptor relative to true dinosaurs are discussed.

The phylogenetic relationships of early dinosaurs: a comparative report

A comparative approach is taken here to show, first, that character choice is a major factor behind differing results; only half of the character data critical for each interpretation is incorporated into the opposing analysis.

Osteology of Eoraptor lunensis (Dinosauria, Sauropodomorpha)

ABSTRACT We describe the basal sauropodomorph Eoraptor lunensis, based on the nearly complete holotypic skeleton and referred specimens, all of which were discovered in the Cancha de Bochas Member

A New Basal Archosauriform Diapsid from the Lower Triassic of Argentina

Koilamasuchus importantly increases the diversity of Archosauriformes during the biotic recovery following the Permo-Triassic mass extinction.

New Specimen Sheds Light on the Anatomy and Taxonomy of the Early Late Triassic Dinosauriforms from the Chañares Formation, NW Argentina

The morphology of the new specimen is completely congruent with that of specimens of Pseudolagosuchus major, bolstering the hypothesis that the latter species is a subjective junior synonym of Lewisuchus admixtus.

The Early Fossil Record of Dinosaurs in North America: A New Neotheropod from the Base of the Upper Triassic Dockum Group of Texas

Using the most comprehensive analysis of early theropod relationships currently available, it is determined that the new specimen represents one of the oldest neotheropods and was present at or just after the onset of both the Chinle Formation and Dockum Group deposits.

The osteology of the early-diverging dinosaur Daemonosaurus chauliodus (Archosauria: Dinosauria) from the Coelophysis Quarry (Triassic: Rhaetian) of New Mexico and its relationships to other early dinosaurs

The osteology of the unusual early-diverging dinosaur Daemonosaurus chauliodus from the latest Triassic Coelophysis Quarry in northern New Mexico, USA is fully detail and demonstrates that members of the original diversification of dinosaurs survived until nearly the end of the Triassic Period.



The tibia and tarsus in Herrerasauridae (Dinosauria, incertae sedis) and the origin and evolution of the dinosaurian tarsus

  • F. Novas
  • Biology, Geography
    Journal of Paleontology
  • 1989
It is concluded that Herrerasauridae retained the primitive tibiotarsal condition for Dinosauria, from which those of the Ornithischia, Sauropodomorpha, and Theropoda were derived.

Dinosaur Monophyly and a New Class of Vertebrates

Evidence is presented that dinosaurs are a single, monophyletic group, and that the key advancements of endothermy and high exercise metabolism are justification for removing dinosaurs from the Reptilia and placing them with birds in a new class, the Dinosauria.

Faunal replacement in the Triassic of South America

Improvements in the locomotor apparatus are discernible in seven groups of archosaurs and indicate that a great adaptive radiation took place before the oldest recorded fauna dominated by archosaurs appeared.

OnStaurikosaums pricei, an early saurischian dinosaur from the Triassic of Brazil, with notes on the Herrerasauridae and Poposauridae

The anatomy of the saurischian dinosaurStaurikosaums pricei Colbert from the Santa Maria Formation (Middle or Upper Triassic) of Rio do Sul, Brazil is redescribed.Staurikosaurus has 9 (or possibly

A preliminary classification of evolutionary radiations

  • D. Erwin
  • Biology, Environmental Science
  • 1992
This work has identified four distinct patterns of evolutionary radiation: novelty events, which generate new morphological complexity but not necessarily with the associated production of many lower taxa; broad diversification events involving many independent lineages that undergo diversification, generate many new species and are driven by new ecological opportunities.

Sues, in The Beginning of the Age

  • J. Vertebr. Paleontol
  • 1986

Paleontol., in press

  • 1992

Lesothosaurus, “Fabrosaurids,” and the early evolution of Ornithischia

New materials of Lesothosaurus diagnosticus permit a detailed understanding of one of the earliest and most primitive ornithischians and suggests long-axis rotation of the mandibular rami during mastication.