[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

Dino news and new non-dino papers

From: Ben Creisler

OK--it's April Fools and the Internet has a bunch of joke dinosaur
items up such as:


Here are a number of legitimate online news stories related to dinosaurs:

Paleoart by Tyler Keillor


Sauropod tracks found in Germany (in German)




Hadrosaur tracks found in Mexico (in Spanish):




Online dinosaur identification quiz (in Portuguese!)
Test your knowledge of the Portuguese versions of dinosaur names:

Recent Non-Dino Papers:

Roger B. J. Benson (2012)
Interrelationships of basal synapsids: cranial and postcranial
morphological partitions suggest different topologies.
Journal of Systematic Palaeontology (advance online publication)

Basal synapsids (‘pelycosaurs’) form the basalmost portion of the
mammalian stem lineage and document the transition from primitive
‘reptile-like’ basal amniotes to derived, mammal-like therapsids. They
dominated terrestrial ecosystems of the latest Carboniferous and Early
Permian (300–271 million years ago), producing large-bodied
terrestrial animals (3–6.5 metres long), high-fibre herbivores, and
macropredators for the first time in vertebrate history, alongside an
array of smaller-bodied forms. Despite numerous recent discoveries and
reassessments of fossils collected over the past 250 years, and
despite their importance for understanding the early diversification
of terrestrial vertebrates, a comprehensive assessment of global
relationships among basal synapsids has not been undertaken. A new
phylogenetic dataset comprising 45 taxa (plus four outgroups and four
therapsids) and 239 characters (147 cranial; 92 postcranial) reveals
considerable uncertainty in the relationships of higher clades of
basal synapsids. Although cranial data support the current consensus
that Caseasauria is the most basal clade, postcranial data and the
full dataset suggest that a clade of Ophiacodontidae + Varanopidae
occupies this position. Although relationships within higher clades
are well supported, relationships among those clades are poorly
supported. The likely source of this uncertainty lies in the
exceptionally poor early record of the group, which renders
determinations of the plesiomorphic condition of higher clades
speculative, although cranial data are generally represented by
shorter ghost lineages and should perhaps be favoured. The new dataset
suggests well-supported phylogenetic placements for several taxa of
historically uncertain affinities: Trichasaurus is a caseid;
Lupeosaurus is an edaphosaurid; and Basicranodon and Ruthiromia are


Kenneth D. Angielczyk & Bruce S. Rubidge (2012)
Skeletal morphology, phylogenetic relationships and stratigraphic
range of Eosimops newtoni Broom, 1921, a pylaecephalid dicynodont
(Therapsida, Anomodontia) from the Middle Permian of South Africa.
Journal of Systematic Palaeontology (advance online publication)

Robert Broom described Eosimops newtoni in 1921 based on a skull
collected in Tapinocephalus Assemblage Zone strata in South Africa,
and the species has been largely overlooked since that time. Here we
present several new specimens of E. newtoni, including a nearly
complete skeleton, that allow a much more thorough description of its
morphology. Eosimops newtoni is diagnosed by two autapomorphies, a
postorbital bar that is anteroposteriorly expanded in lateral view and
a posterior median palatal ridge that forms a flattened, Y-shaped
platform surrounding the anterior median palatal ridges. Other
characters include a single median nasal boss; parietals widely
exposed on the skull roof; presence of lateral anterior palatal
ridges; anterior edge of caniniform process set off from the palatal
rim forming a notch; a small number of ‘postcanine’ teeth on the
maxilla; a large, ventrally directed transverse flange on the anterior
pterygoid ramus; a robust, tall, blocky crista oesophagea; a
shovel-shaped jaw symphysis; dentary tables absent; posterior dentary
sulcus present and bounded medially by a dorsally convex blade; at
least one ‘postcanine’ tooth present on the dentary blade; three
sacral vertebrae; cleithrum present; dorsal margin of the coracoid
foramen formed by the scapula; proximal and distal ends of the humerus
offset by approximately 90°; ectepicondylar foramen present; and
trochlea and capitellum distinct. Comparison with Brachyprosopus
broomi and Koupia koupensis shows that neither species is likely to be
a junior synonym of E. newtoni. Phylogenetic analysis reconstructs E.
newtoni as the most basal member of Pylaecephalidae. We also reassess
the homologies and distribution of the dentary table and posterior
dentary sulcus in dicynodonts in light of the jaw morphology of E.
newtoni. The stratigraphic range of Eosimops newtoni begins in the
Tapinocephalus Assemblage Zone, 1565 metres above the Ecca–Beaufort
contact, and extends into the Pristerognathus Assemblage Zone.