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paleontology

Metriorhynchids were a widely distributed group of marine crocodylomorphs that thrived during the Middle Jurassic–Early Cretaceous. Within this group there is a subclade, Geosaurini, that evolved craniodential characteristics indicative of macrophagy (feeding on...

["Marine Biology","Paleontology","Taxonomy","Zoology"]
doi:10.7287/peerj.preprints.1345v1
51 downloads
81 views

The first dromaeosaurid theropod from the Early Cretaceous Bayan Gobi Formation is identified based on an incompletely preserved partially-articulated left leg, increasing the known diversity of its understudied ecosystem. The leg belongs to specimen IVPP V22530...

["Paleontology","Taxonomy","Zoology"]
doi:10.7287/peerj.preprints.1340v1
341 downloads
568 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.1135v2
75 downloads
336 views

The tails of extant crocodilians are anatomically the closest approximation of the tails of non-avian dinosaurs, and therefore a good starting point for any reconstruction of non-avian dinosaur tail muscles. However, we here demonstrate some methodological problems...

["Paleontology","Zoology"]
doi:10.7287/peerj.preprints.1339v1
247 downloads
1,418 views

In contrast to dominant mode of ecological transition in the evolution of marine mammals, different lineages of toothed whales (Odontoceti) have repeatedly invaded freshwater ecosystems during the Cenozoic era. The so-called ‘river dolphins’ are now recognized...

["Ecology","Evolutionary Studies","Marine Biology","Paleontology","Zoology"]
doi:10.7717/peerj.1227
57 downloads
378 views

Background. Neochelys franzeni Schleich, 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:10.7717/peerj.1221
79 downloads
194 views

Basal hadrosauriform iguanodontian dinosaurs have been invaluable towards understanding the evolution of the complex and highly efficient advanced hadrosauriform tooth battery dental system. Here we report a new basal hadrosauriform maxilla specimen - IVPP V22529...

["Paleontology","Taxonomy"]
doi:10.7287/peerj.preprints.1329v1
338 downloads
1,817 views

Despite being known for nearly two centuries, new specimens of the derived non-pterodactyloid pterosaur Rhamphorhynchus continue to be discovered and reveal new information about their anatomy and palaeobiology. Here we describe a specimen held in the collections...

["Paleontology"]
doi:10.7717/peerj.1191
1 citation
125 downloads
584 views

Background. The Late Cretaceous is a keystone period to understand the origin and early radiation of Crocodylia, the group containing all extant lineages of crocodilians. Among the taxa described from the latest Cretaceous of Europe, the genus Allodaposuchus is...

["Animal Behavior","Paleontology","Taxonomy","Zoology"]
doi:10.7717/peerj.1171
77 downloads
443 views

Background. The Cretaceous of southern Europe was characterized by an archipelago setting with faunas of mixed composition of endemic, Laurasian and Gondwanan elements. However, little is known about the relative timing of these faunal influences. The Lower Cretaceous...

["Paleontology"]
doi:10.7717/peerj.1160
36 downloads
123 views

Trilobites are extinct marine arthropods that dominated the faunas of the Palaeozoic. They were equipped with highly differentiated compound eyes. By contrast with all other arthropods, the lenses of these compound eyes were of pure calcite. Calcite shows photoluminescence...

["Biophysics","Paleontology"]
doi:10.7287/peerj.preprints.1288v1
45 downloads
380 views

Giraffa sivalensis occurred during the Plio-Pleistocene period and probably represents the terminal species of the genus in Southern Asia. The holotype is an almost perfectly preserved cervical vertebra of disputed anatomical location. Although there is also uncertainty...

["Evolutionary Studies","Paleontology","Zoology"]
doi:10.7717/peerj.1135
35 downloads
191 views

Background. In a recent paper, we proposed a lectotype for the species Plesiochelys langii Rütimeyer, 1873. However, we failed to register this publication in ZooBank as required by the International Commission on Zoological Nomenclature (ICZN) for electronic publication....

["Paleontology","Taxonomy"]
doi:10.7717/peerj.1108
234 downloads
662 views

Palaeopathology offers unique insight to the healing strategies of extinct organisms, permitting questions concerning bone physiology to be answered in greater depth. Unfortunately, most palaeopathological studies are confined to external morphological interpretations...

["Paleontology","Veterinary Medicine","Zoology","Histology"]
doi:10.7717/peerj.1130
82 downloads
449 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.1110v2

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