• Publications
  • Influence
The phylogeny of Tetanurae (Dinosauria: Theropoda)
An exhaustive examination of all basal tetanurans and all existing character data, taking advantage of recent discoveries and adding new morphological, temporal and geographic data achieved significantly improved phylogenetic resolution. Expand
Faunal turnover of marine tetrapods during the Jurassic–Cretaceous transition
The observation of discordant extinction patterns in other marine tetrapod groups such as ichthyosaurs and marine crocodylomorphs suggests that clade‐specific factors may have been more important than overarching extrinsic drivers of faunal turnover during the Jurassic–Cretaceous boundary interval. Expand
Global interrelationships of Plesiosauria (Reptilia, Sauropterygia) and the pivotal role of taxon sampling in determining the outcome of phylogenetic analyses
  • H. Ketchum, R. Benson
  • Biology, Medicine
  • Biological reviews of the Cambridge Philosophical…
  • 1 May 2010
A new phylogenetic data set of 66 taxa (67% of ingroup taxa examined directly) and 178 characters (eight new) is presented, indicating that the large‐headed, short‐necked ‘pliosauromorph’ body plan evolved twice within Plesiosauria. Expand
Rates of Dinosaur Body Mass Evolution Indicate 170 Million Years of Sustained Ecological Innovation on the Avian Stem Lineage
Early dinosaurs showed rapid evolutionary rates, which were sustained on the line leading to birds. Maintenance of evolvability in key lineages might explain the uneven distribution of traitExpand
A description of Megalosaurus bucklandii (Dinosauria: Theropoda) from the Bathonian of the UK and the relationships of Middle Jurassic theropods
Megalosaurus bucklandii (Dinosauria: Theropoda), the oldest named dinosaur taxon, from the Bathonian of England, is a valid taxon diagnosed by a unique character combination of the lectotype dentary, and a new phylogenetic analysis focuses on basal tetanurans, revealing several new results. Expand
Mesozoic marine tetrapod diversity: mass extinctions and temporal heterogeneity in geological megabiases affecting vertebrates
Some evidence supports an extinction event near the Jurassic/Cretaceous boundary, but the proposed end-Cenomanian extinction is probably an artefact of poor sampling, and consideration of sampling biases allows re-evaluation of proposed mass extinction events. Expand
Interrelationships of basal synapsids: cranial and postcranial morphological partitions suggest different topologies
A new phylogenetic dataset comprising 45 taxa (plus four outgroups and four therapsids) and 239 characters reveals considerable uncertainty in the relationships of higher clades of basal synapsids, and suggests well-supported phylogenetic placements for several taxa of historically uncertain affinities. Expand
High Diversity, Low Disparity and Small Body Size in Plesiosaurs (Reptilia, Sauropterygia) from the Triassic–Jurassic Boundary
High rhomaleosaurid diversity immediately following the Triassic-Jurassic boundary supports the gradual model of Late Triassic extinctions, mostly predating the boundary itself. Expand
A Giant Pliosaurid Skull from the Late Jurassic of England
The authors' data support a trend of decreasing length of the mandibular symphysis through Late Jurassic time, as previously suggested, and may be correlated with increasing adaptation to feeding on large prey. Expand
The cranial anatomy and taxonomy of Peloneustes philarchus (Sauropterygia, Pliosauridae) from the Peterborough Member (Callovian, Middle Jurassic) of the United Kingdom
Well-preserved material clearly indicates that P. philarchus lacked nasals, but possessed a lacrimal, and a previously unrecognised ‘palpebral’ forms part of the dorsal orbit margin adjacent to the prefrontal. Expand