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paleontology
4 downloads
5 views

Background. Neochelys franzeni (Schelich, 1993) is the only pleurodire or side-necked turtle from the middle Eocene, Messel Pit (the first UNESCO, World Natural Heritage Site in Germany, since 1995). The original description of the species is based on two specimens...

["Biodiversity","Evolutionary Studies","Paleontology","Taxonomy","Zoology"]
doi:10.7287/peerj.preprints.874v1
8 downloads
12 views

Background. A new podocnemidid taxon from the Adamantina Formation (Campanian to Maastrichtian), Bauru Group - Paraná Basin (southeastern Brazil) is presented. Some multifragmented specimens were discovered near 30 years ago, in the region of Álvarez Machado (State...

["Paleontology","Zoology"]
doi:10.7287/peerj.preprints.873v1
49 views

Background. Solemydidae is an enigmatic clade of stem turtles, which is primarily represented by fragmentary shell material found in Upper Jurassic and Cretaceous deposits of Europe and North America. Specimens are typically identified by a distinct surface ornamentation...

["Paleontology"]
doi:10.7287/peerj.preprints.863v1
22 views

Background. Large-sized testudinids had a long evolutionary history in Europe during the last 50 million years before becoming extinct in the beginning of the Pleistocene. Despite a 150-year long history in research and a decent fossil record, the European large...

["Paleontology"]
doi:10.7287/peerj.preprints.862v1
33 downloads
64 views

Background. Previous quantitative studies about Bauruemys elegans (Suárez, 1969) shell variation, as well as the taphonomy interpretation of its type locality, have suggested that all specimens collected in this locality may have belonged to the same population....

["Paleontology","Zoology"]
doi:10.7287/peerj.preprints.859v1
78 downloads
140 views

Background. The origin of turtles, their earliest evolution and the homologies of the elements building their shell are still enigmatic and remain an object of ongoing discussion and research. Although the oldest fully shelled turtle – Proterochersis robusta from...

["Evolutionary Studies","Paleontology","Zoology"]
doi:10.7287/peerj.preprints.858v1
9 downloads
5 views

In 2011, I proposed a new hypothesis for the evolution and development of the five-rayed structure of echinoderms, the Hexamer Hypothesis (Lussanet, 2011). According to this hypothesis, the five-rayed structure develops by reduction from a six-rayed Bauplan. Crinoids...

["Developmental Biology","Paleontology"]
doi:10.7287/peerj.preprints.857v1
31 downloads
49 views

Background. Over the course of the last decades, much effort has gone into unraveling the biogeographic history of turtles, but while much progress has been achieved in resolving post- Jurassic dispersal events, traditional phylogenetic hypotheses have yielded...

["Paleontology"]
doi:10.7287/peerj.preprints.853v1
119 downloads
184 views

In this paper, I comment on Porfiri et al. (2014), "Juvenile specimen of Megaraptor (Dinosauria, Theropoda) sheds light about tyrannosauroid radiation". Though Porfiri et al. provided numerous coelurosaurian characters on the Megaraptor specimen, their referral...

["Evolutionary Studies","Paleontology","Taxonomy","Zoology"]
doi:10.7287/peerj.preprints.851v1
136 downloads
160 views

In this paper, I comment on Larson's 2013 paper "The case for Nanotyrannus". All the osteological differences proposed by Larson (2013) seem to be due to ontogeny and individual variation. Therefore, Larson's claim that "Nanotyrannus lancensis" is not a juvenile...

["Evolutionary Studies","Paleontology","Taxonomy","Zoology"]
doi:10.7287/peerj.preprints.852v1
211 downloads
422 views

The neuroanatomy of hadrosaurid dinosaurs is well known from North America and Asia. In Europe only a few cranial remains have been recovered that include the braincase. Arenysaurus is the first European endocast for which the paleoneuroanatomy has been studied....

["Paleontology"]
doi:10.7717/peerj.802
84 downloads
231 views

The Kayenta Formation has yielded numerous tetrapod fossils, including, amphibians, theropods, prosauropods, ornithischians, crocodylomorphs, sphenodonts, tritylodonts, pterosaurs, turtles, and rare mammals. Despite the phylogenetic diversity of the preserved animals,...

["Biogeography","Evolutionary Studies","Paleontology"]
doi:10.7287/peerj.preprints.848v1
88 downloads
217 views

The Permo-Triassic archosauromorph record is crucial to understand the impact of the Permo-Triassic mass extinction on the early evolution of the group and its subsequent dominance in Mesozoic terrestrial ecosystems. However, the Permo-Triassic archosauromorph...

["Biogeography","Evolutionary Studies","Paleontology","Taxonomy","Zoology"]
doi:10.7717/peerj.776
297 downloads
407 views

In the summer of 1878, American paleontologist Edward Drinker Cope published the discovery of a sauropod dinosaur that he named Amphicoelias fragillimus. What distinguishes A. fragillimus in the annals of paleontology is the immense magnitude of the skeletal material....

["Paleontology"]
doi:10.7287/peerj.preprints.838v1
284 downloads
414 views

Eusuchian crocodyliforms, which include all living crocodylians, have historically been characterized by two anatomical specializations: a ball-in-socket vertebral joint and an extensive secondary hard palate with a pterygoid-bound internal choana. The Early Cretaceous...

["Evolutionary Studies","Paleontology"]
doi:10.7717/peerj.759

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