On a Sacrum, apparently indicating a new type of Bird, Ornithodesmus cluniculus, Seeley, from the Wealden of Brook

@article{SeeleyOnAS,
  title={On a Sacrum, apparently indicating a new type of Bird, Ornithodesmus cluniculus, Seeley, from the Wealden of Brook},
  author={Harry Govier Seeley},
  journal={Quarterly Journal of the Geological Society of London},
  volume={43},
  pages={206 - 211}
}
  • H. Seeley
  • Published 1 February 1887
  • Geology
  • Quarterly Journal of the Geological Society of London
The discovery of the pneumatic condition of the vertebræ in Ornithosaurs and certain Dinosaurs showed that they diverge from Reptiles in structural characters which are typically Ornithic. The augmented number of vertebræ in the sacrum in both those groups also shows a divergence from existing Reptiles, which is markedly Avian. On the other hand, the small number of sacral vertebræ found in the Archæopteryx has proved that a bird may have the sacrum no more complex than in Ornithosaurs and… 

Figures from this paper

Giant azhdarchid pterosaurs from the terminal Cretaceous of Transylvania (western Romania)
Abstract Pterosaur remains from the Late Cretaceous of the Haţeg Basin of western Romania were reported by Nopcsa as early as 1899. Recent discoveries from the Late Maastrichtian Densuş-Ciula
A small, unusual theropod (Dinosauria) femur from the Wealden Group (Lower Cretaceous) of the Isle of Wight, England
A complete femur of a small theropod dinosaur from the Wessex l Formation (Wealden Group, Lower Cretaceous) of the Isle of Wight, England, is described for the first time. In differing from other
Computational modelling of locomotor muscle moment arms in the basal dinosaur Lesothosaurus diagnosticus: assessing convergence between birds and basal ornithischians
TLDR
Results suggest that locomotor muscle leverage in Lesothosaurus (and by inference basal ornithischians in general) was more similar to that of other non‐avian dinosaurs than the ostrich, representing what was probably the basal dinosaur condition, which contradicts previous hypotheses of ornithischer–bird functional convergence.
Osteology of Cryolophosaurus ellioti (Dinosauria: Theropoda) from the Early Jurassic of Antarctica and implications for early theropod evolution
TLDR
An in-depth morphological description of Cryolophosaurus is pre-sented here, along with a rigorous phylogenetic analysis of theropod relationships consisting of 347 characters and 56 taxa, in an attempt to clarify the relationships of Crylophosaurus and to provide insight into questions sur-rounding early theropid evolution.
The skull of Velociraptor [Theropoda] from the Late Cretaceous of Mongolia
The well preserved material of the Late Cretaceous dromaeosaurid, Velociraptor mongoliensis, has allowed us to supplement earlier descriptions of the skull in this species. The skull of I?
Pennaraptoran Theropod Dinosaurs Past Progress and New Frontiers
...
1
2
...