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paleontology
17 downloads
27 views

Knowledge regarding the early evolution within the dinosaurian clade Ankylopollexia drastically increased over the past two decades, in part because of an increase in described taxa from the Early Cretaceous of North America. These advances motivated the recent...

["Evolutionary Studies","Paleontology","Taxonomy"]
doi:10.7287/peerj.preprints.1135v1
6 downloads
9 views

Background. The turtle body plan differs markedly from that of other vertebrates and serves as a model system for studying structural and developmental evolution. Incorporation of the ribs into the iconic turtle shell negates the rib movements that effect lung...

["Evolutionary Studies","Paleontology","Zoology"]
doi:10.7287/peerj.preprints.1128v1
42 downloads
112 views

An unusual tetrapod tooth was discovered in the Late Triassic Chinle Formation of southeastern Utah. The tooth was originally thought to belong to Revueltosaurus but further investigations have rejected that hypothesis. In this paper we compare MNA V10668 to other...

["Biodiversity","Paleontology"]
doi:10.7287/peerj.preprints.1110v1
11 downloads
36 views

Background. Sakya Bogachev, 1960 is a genus of geoemydid turtles with unusual scalation of the carapace consisting of 9–10 vertebrals and 8–10 pairs of pleurals. It is known from Neogene localities of Eastern Europe and includes two species: Sakya riabinini (Khosatzky,...

["Paleontology"]
doi:10.7287/peerj.preprints.1089v1
8 downloads
14 views

Background. Xinjiangchelyidae are a group of basal cryptodires from the Middle Jurassic – Early Cretaceous of Asia and Early Cretaceous of Europe. Recent studies show that xinjiangchelyids are rather uniform and conservative in their shell morphology and comparatively...

["Paleontology"]
doi:10.7287/peerj.preprints.1088v1
10 downloads
19 views

Background. This report reviews data on taxonomic diversity and paleobiogeography of Late Cretaceous (K2) non-marine turtles of Asia accumulated since latest reviews in 2000s. K2 non-marine turtles of Asia are known from four main geographical areas: Middle Asia-Kazakhstan...

["Biodiversity","Biogeography","Paleontology"]
doi:10.7287/peerj.preprints.1087v1
16 downloads
44 views

Background. Regardless using a rank-based or a phylogenetic nomenclature code, the use of Latinized binomens to describe the extant and extinct species has been essential. Ever since the times of Linnaeus, the use of Latinized Greek names has been a common practice...

["Paleontology","Taxonomy"]
doi:10.7287/peerj.preprints.1081v1
554 downloads
1,370 views

Open-nesting birds use biological pigments in eggshell to camouflage their unhatched offspring, varying the colour to account for the nesting environment and location. The tetrapyrrolic pigments protoporphyrin (PP) and biliverdin (BV), which both participate in...

["Evolutionary Studies","Molecular Biology","Paleontology"]
doi:10.7287/peerj.preprints.1080v1
16 downloads
42 views

Background. Podocnemis bassleri Williams, 1956 is the oldest definite record for Podocnemis, dating back to the Miocene of South America. However, the diagnosis of P. ba. is fragile, as assumed by Williams himself. Here we evaluated the hypothesis of P. ba. as...

["Bioinformatics","Evolutionary Studies","Paleontology","Taxonomy","Zoology"]
doi:10.7287/peerj.preprints.1077v1
323 downloads
1,001 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
94 downloads
420 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
14 downloads
26 views

Background. The recent data on Panchelonioidea’s phylogeny suggested the family level relationships as (Toxochelyidae, (Cheloniidae, (Protostegidae, Dermochelyidae))). Despite the similarity between their limbs, it is known that the flippers morphology on marine...

["Evolutionary Studies","Paleontology","Zoology"]
doi:10.7287/peerj.preprints.1039v1
20 downloads
28 views

Rothschild (2014) argues that many tyrannosaurid tooth marks left on isolated dinosaur bones cannot be attributable to their feeding behavior but instead, can be attributable to their play behavior. However, the evidence suggested by Rothschild (2014) are very...

["Animal Behavior","Paleontology","Zoology"]
doi:10.7287/peerj.preprints.1028v1
93 downloads
247 views

The origin of mammalian endothermy has long been held to reside within the early therapsid groups. However, shared histological characteristics have been observed in the bone matrix and vascularity between Ophiacodontidae and the later therapsids (Synapsida). Historically,...

["Paleontology"]
doi:10.7287/peerj.preprints.1027v1
194 downloads
869 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

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