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Total of 124 results See all subject areas
paleontology

Shed dinosaur teeth are commonly collected microvertebrate remains that have been used for interpretations of dinosaur feeding behaviors, paleoecology, and population studies. However, such interpretations may be biased by taphonomic processes such as fluvial sorting...

["Paleontology"]
doi:10.7717/peerj.347

Therocephalians were a speciose clade of nonmammalian therapsids whose ecological diversity and survivorship of the end-Permian mass extinction offer the potential to investigate the evolution of growth patterns across the clade and their underlying influences...

["Evolutionary Studies","Histology","Paleontology"]
doi:10.7717/peerj.325

The dinosaur Plateosaurus engelhardti is the most abundant dinosaur in the Late Triassic of Europe and the best known basal sauropodomorph. Plateosaurus engelhardti was one of the first sauropdomorph dinosaurs to display a large body size. Remains can be found...

["Paleontology"]
doi:10.7287/peerj.preprints.325v1

The number of cervical vertebrae in mammals is highly conserved at seven. We have shown that changes of this number are selected against due to a coupling with major congenital abnormalities (pleiotropic effects). Here we show that the incidence of abnormal cervical...

["Evolutionary Studies","Paleontology"]
doi:10.7717/peerj.318

Excavations and studies of existing collections during the last decades have significantly increased the abundance as well as the diversity of the avian fossil record for Insular Southeast Asia. The avian fossil record covers the Eocene through the Holocene, with...

["Biogeography","Ecology","Paleontology","Zoology"]
doi:10.7717/peerj.295

The number of cervical vertebrae in mammals is highly conserved at seven. We have shown that changes of this number are selected against due to a coupling with major congenital abnormalities (pleiotropic effects, (Galis 1999, Galis et al. 2006, Varela-Lasheras...

["Evolutionary Studies","Paleontology","Veterinary Medicine"]
doi:10.7287/peerj.preprints.263v1

Centrosaurus apertus, a large bodied ceratopsid from the Late Cretaceous of North America, is one of the most common fossils recovered from the Belly River Group. This fossil record shows a wide diversity in morphology and size, with specimens ranging from putative...

["Paleontology"]
doi:10.7717/peerj.252

Plesiochelyidae are a major component of Late Jurassic shallow marine environments throughout Europe. However, the taxonomy of plesiochelyid turtles is rather confused. Over the years, many taxa have been synonymized with Plesiochelys etalloni, one of the first...

["Evolutionary Studies","Paleontology","Taxonomy"]
doi:10.7717/peerj.258

The discovery of Hongshanornis longicresta, a small ornithuromorph bird with unusually long hindlimb proportions, was followed by the discovery of two closely related species, Longicrusavis houi and Parahongshanornis chaoyangensis. Together forming the Hongshanornithidae,...

["Paleontology","Taxonomy","Zoology"]
doi:10.7717/peerj.234

Snout shape is a prominent aspect of herbivore feeding ecology, controlling both forage selectivity and intake rate. Many previous investigations have suggested that ruminant feeding classes can be discriminated via snout shape, with grazing and browsing species...

["Animal Behavior","Conservation Biology","Ecology","Paleontology","Zoology"]
doi:10.7287/peerj.preprints.176v1

Plesiochelyidae are a major component of Late Jurassic shallow marine environments throughout Europe. However, the taxonomy of the plesiochelyid turtles is rather confused. Over the years, many taxa have been synonymized with Plesiochelys etalloni, one of the first...

["Evolutionary Studies","Paleontology","Taxonomy"]
doi:10.7287/peerj.preprints.160v1

Finite element analysis (FEA) is a computational technique of growing popularity in the field of comparative biomechanics, and is an easily accessible platform for form-function analyses of biological structures. However, its rapid evolution in recent years from...

["Bioengineering","Computational Biology","Paleontology","Zoology","Anatomy and Physiology"]
doi:10.7717/peerj.204

A new species of an archaic primate (Pleisadapiformes) is described based on a maxilla containing the first and second upper molars from the Fort Union Formation, Atwell Gulch Member in northwestern Colorado. The preserved teeth show the unusual dental characteristics...

["Paleontology"]
doi:10.7717/peerj.191

The tube-crested hadrosaurid dinosaur Parasaurolophus is remarkable for its unusual cranial ornamentation, but little is known about its growth and development, particularly relative to well-documented ontogenetic series for lambeosaurin hadrosaurids (such as Corythosaurus,...

["Evolutionary Studies","Paleontology","Zoology"]
doi:10.7717/peerj.182

The new species Chelodina (Chelodina) murrayi is described from the late Miocene Alcoota Local Fauna of central Australia, in the Northern Territory. The new species is based on shell fragments and can be diagnosed by a ventrally reflexed anterior margin of the...

["Paleontology","Taxonomy","Zoology"]
doi:10.7717/peerj.170

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