Unstable taxa in cladistic analysis: identification and the assessment of relevant characters
A protocol for detecting unstable branches (either terminal taxa or clades) and identifying particular characters related to their instability in cladistic analysis and can be used as a guide for further research efforts focused on the revision or addition of (morphological or molecular) phylogenetic data for elucidating the affinities of unstable taxa.
A Basal Dromaeosaurid and Size Evolution Preceding Avian Flight
- A. Turner, D. Pol, J. Clarke, G. Erickson, M. Norell
- Biology, Environmental ScienceScience
- 7 September 2007
Change in theropod body size leading to flight's origin was not unidirectional, and the two dinosaurian lineages most closely related to birds, dromaeosaurids and troodontids, underwent four independent events of gigantism, and in some lineages size increased by nearly three orders of magnitude.
A pug-nosed crocodyliform from the Late Cretaceous of Madagascar
An exquisitely preserved specimen of a new taxon from the Late Cretaceous of Madagascar is reported, possessing an extremely blunt snout, a tall, rounded skull, an anteriorly shifted jaw joint and clove-shaped, multicusped teeth reminiscent of those of some ornithischian dinosaurs.
An Unusual Marine Crocodyliform from the Jurassic-Cretaceous Boundary of Patagonia
The morphological diversity of pelagic marine crocodyliforms was wider than had been thought and the snout and lower jaw are extremely robust, short, and high and only bear a few large teeth with serrated edges.
Morphology of the Late Cretaceous Crocodylomorph Shamosuchus djadochtaensis and a Discussion of Neosuchian Phylogeny as Related to the Origin of Eusuchia
A review of all the available evidence on the diversity of advanced neosuchians suggests this group achieved a worldwide distribution and a remarkable morphological diversity, pushing their evolutionary origins back to the Jurassic.
NEW REMAINS OF SPHAGESAURUS HUENEI (CROCODYLOMORPHA: MESOEUCROCODYLIA) FROM THE LATE CRETACEOUS OF BRAZIL
- D. Pol
- Biology, Geography
- 24 December 2003
The skull of Sphagesaurus huenei, a previously poorly known form from the Late Cretaceous of southern Brazil, shows unexpected morphology for a crocodyliform, including an extreme heterodonty with small lower incisors, large upper caniniforms, and reversed triangle-like postcanines.
Skull anatomy of Dakosaurus andiniensis (Thalattosuchia: Crocodylomorpha) and the phylogenetic position of Thalattosuchia
The phylogenetic analysis reported here results in a most parsimonious hypothesis that depicts Thalattosuchia nested within NeOSuchia and the strength and character evidence supporting this position is presented.
A Complete Skull of an Early Cretaceous Sauropod and the Evolution of Advanced Titanosaurians
A new sauropod dinosaur from the Early Cretaceous of Brazil represents the earliest advanced titanosaurian known to date, demonstrating that the initial diversification of advanced titosaurians was well under way at least 30 million years before their known radiation in the latest Cret Jurassic.
A New Notosuchian from the Late Cretaceous of Brazil and the Phylogeny of Advanced Notosuchians
- D. Pol, Paulo M. Nascimento, A. Carvalho, C. Riccomini, R. Pires-Domingues, H. Zaher
- BiologyPloS one
- 2 April 2014
The phylogenetic analysis results in a monophyletic genus Caipirasuchus, that is the sister group of a clade fomed by Sphagesaurus huenei, Caryonosuchus pricei, and Armadillosuchu arrudai, and Sphagesaurids also include a basal clade formed by Adamantinasuchus navae and Yacarerani boliviensis.
Postcranial Anatomy of Sebecus icaeorhinus (Crocodyliformes, Sebecidae) from the Eocene of Patagonia
The new material reveals numerous details on the postcranial anatomy of this crocodyliform, including the presence of proportionately long limbs and 10 autapomorphies in the vertebrae, forelimb, and pelvic girdle (some of which are interpreted as adaptations to terrestriality and an erect limb posture).