Total of 38 results Filter on subject area
paleontology
209 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
87 downloads
209 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
283 downloads
410 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
109 downloads
381 views

Emus (Dromaius novaehollandiae) are exclusively terrestrial, bipedal and cursorial ratites with some similar biomechanical characteristics to humans. Their growth rates are impressive, as their body mass increases eighty-fold from hatching to adulthood whilst maintaining...

["Bioengineering","Developmental Biology","Evolutionary Studies","Paleontology","Anatomy and Physiology"]
doi:10.7717/peerj.716
256 downloads
725 views

Attempts to reconstruct the neutral neck posture of sauropod dinosaurs, or indeed any tetrapod, are doomed to failure when based only on the geometry of the bony cervical vertebrae. The thickness of the articular cartilage between the centra of adjacent vertebrae...

["Animal Behavior","Evolutionary Studies","Paleontology","Anatomy"]
doi:10.7717/peerj.712
1 citation
75 downloads
209 views

The patella (kneecap) exhibits multiple evolutionary origins in birds, mammals, and lizards, and is thought to increase the mechanical advantage of the knee extensor muscles. Despite appreciable interest in the specialized anatomy and locomotion of palaeognathous...

["Evolutionary Studies","Paleontology","Histology"]
doi:10.7717/peerj.711
252 downloads
852 views

The South African species Euparkeria capensis is of great importance for understanding the early radiation of archosauromorphs (including archosaurs) following the Permo–Triassic mass extinction, as most phylogenetic analyses place it as the sister taxon to crown...

["Biodiversity","Evolutionary Studies","Paleontology","Taxonomy","Zoology"]
doi:10.7717/peerj.658
361 downloads
1,254 views

Though the dinosaur Thescelosaurus neglectus was first described in 1913 and is known from the relatively fossiliferous Lance and Hell Creek formations in the Western Interior Basin of North America, the cranial anatomy of this species remains poorly understood....

["Paleontology","Taxonomy"]
doi:10.7717/peerj.669
249 downloads
908 views

Arachnids are an important group of arthropods. They are: diverse and abundant; a major constituent of many terrestrial ecosystems; and possess a deep and extensive fossil record. In recent years a number of exceptionally preserved arachnid fossils have been investigated...

["Evolutionary Studies","Paleontology","Taxonomy","Zoology"]
doi:10.7717/peerj.641
78 downloads
179 views

The Moscovian plant macroflora at Cottage Grove southeastern Illinois, USA, is a key example of Pennsylvanian (323–299 Million years ago) dryland vegetation. There is currently no palynological data from the same stratigraphic horizons as the plant macrofossils,...

["Ecology","Paleontology","Plant Science"]
doi:10.7717/peerj.630
212 downloads
795 views

We document a new species of ovulate cone (Pararaucaria collinsonae) on the basis of silicified fossils from the Late Jurassic Purbeck Limestone Group of southern England (Tithonian Stage: ca. 145 million years). Our description principally relies on the anatomy...

["Evolutionary Studies","Paleontology","Plant Science"]
doi:10.7717/peerj.624
304 downloads
1,267 views

The capacity for aerial maneuvering was likely a major influence on the evolution of flying animals. Here we evaluate consequences of paravian morphology for aerial performance by quantifying static stability and control effectiveness of physical models for numerous...

["Biophysics","Evolutionary Studies","Paleontology","Zoology"]
doi:10.7717/peerj.632
208 downloads
534 views

The Otodontidae include some of the largest sharks to ever live in the world’s oceans (i.e., Carcharocles megalodon). Here we report on Paleocene and Eocene occurrences of Otodus obliquus and Carcharocles auriculatus from Alabama, USA. Teeth of Otodus are rarely...

["Paleontology"]
doi:10.7717/peerj.625
252 downloads
528 views

Tyrannoneustes lythrodectikos is one of numerous metriorhynchid crocodylomorph species known from the Oxford Clay Formation of England (Callovian-Oxfordian; Middle-Late Jurassic). This taxon is of evolutionary importance, as it is the oldest and most basal known...

["Paleontology"]
doi:10.7717/peerj.608
248 downloads
1,708 views

Atoposaurid crocodyliforms represent an important faunal component of Late Jurassic to Early Cretaceous Laurasian semi-aquatic to terrestrial ecosystems, with numerous spatiotemporally contemporaneous atoposaurids known from western Europe. In particular, the Late...

["Paleontology","Taxonomy"]
doi:10.7717/peerj.599

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