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paleontology
306 downloads
850 views

Adult large-bodied theropods are often found with numerous pathologies. A large, almost complete, probably adult Allosaurus specimen from the Howe Stephens Quarry, Morrison Formation (Late Kimmeridgian–Early Tithonian), Wyoming, exhibits multiple pathologies. Pathologic...

["Animal Behavior","Paleontology","Veterinary Medicine","Zoology","Pathology"]
doi:10.7717/peerj.940
90 downloads
385 views

Thylacinus yorkellus is described as a new, moderately small-bodied species of thylacinid from the latest Miocene or, more likely, earliest Pliocene of South Australia. The new species can be diagnosed by the autapomorphic presence a strongly developed precingulid...

["Biodiversity","Evolutionary Studies","Paleontology","Taxonomy","Zoology"]
doi:10.7717/peerj.931
186 downloads
820 views

Sexual dimorphism in body size is often used as a correlate of social and reproductive behavior in Australopithecus afarensis. In addition to a number of isolated specimens, the sample for this species includes two small associated skeletons (A.L. 288-1 or “Lucy”...

["Anthropology","Paleontology"]
doi:10.7717/peerj.925
63 downloads
275 views

The Paleozoic–Mesozoic transition is characterized by the most massive extinction of the Phanerozoic. Nevertheless, an impressive adaptive radiation of herbivorous insects occurred on gymnosperm-dominated floras not earlier than during the Middle to Late Triassic,...

["Ecology","Paleontology"]
doi:10.7717/peerj.921
96 downloads
534 views

Originally identified as an ornithischian dinosaur, Crosbysaurus harrisae has been found in New Mexico, Arizona, and its type locality in Texas, as well as in North Carolina. The genus has been reassessed by other workers in light of reinterpretations about the...

["Paleontology"]
doi:10.7717/peerj.905
142 downloads
534 views

We report a new deltatheroidan mammal from the Upper Cretaceous of Henna, China. The new taxon, Lotheridium mengi, is based on a nearly complete skull and associated lower jaws with full adult dentition. Deltatheroidans are known mostly from fragmentary specimens...

["Paleontology"]
doi:10.7717/peerj.896
1 citation
687 downloads
4,616 views

Trace marks on the bones of non-avian dinosaurs may relate to feeding by large carnivores or as a result of combat. Here the cranium and mandible of a specimen of Daspletosaurus are described that show numerous premortem injuries with evidence of healing and these...

["Animal Behavior","Ecology","Paleontology"]
doi:10.7717/peerj.885
3,029 downloads
19,132 views

Diplodocidae are among the best known sauropod dinosaurs. Several species were described in the late 1800s or early 1900s from the Morrison Formation of North America. Since then, numerous additional specimens were recovered in the USA, Tanzania, Portugal, and...

["Paleontology","Taxonomy"]
doi:10.7717/peerj.857
80 downloads
372 views

We describe a Mesozoic fish Paralycoptera sp. (Teleostei: Osteoglossoidei), on the basis of a postcranial skeleton collected from the volcaniclastic mudstones of the Lai Chi Chong Formation of Hong Kong, China. The new finding—representing the city’s first Mesozoic...

["Aquaculture, Fisheries and Fish Science","Evolutionary Studies","Paleontology","Taxonomy","Zoology"]
doi:10.7717/peerj.865
219 downloads
794 views

Quantitative morphometric analyses, particularly ontogenetic allometry, are common methods used in quantifying shape, and changes therein, in both extinct and extant organisms. Due to incompleteness and the potential for restricted sample sizes in the fossil record,...

["Evolutionary Studies","Paleontology","Zoology","Statistics"]
doi:10.7717/peerj.818
228 downloads
662 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
131 downloads
348 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
266 downloads
526 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
130 downloads
481 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
308 downloads
835 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

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