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paleontology
7 downloads
65 views

Homalozoa are a weird group of echinoderms, for their complete lack of radiate symmetry. Indeed, they are typified by their tendency to marked asymmetric body forms. It has been proposed that they asymmetric forms evolved from bilaterally symmetric ones, but so...

["Developmental Biology","Evolutionary Studies","Paleontology"]
doi:10.7287/peerj.preprints.2009v1
627 downloads
2,623 views

The early evolution of archosauromorphs during the Permo-Triassic constitutes an excellent empirical case study to shed light on evolutionary radiations in deep time and the timing and processes of recovery of terrestrial faunas after a mass extinction. However,...

["Evolutionary Studies","Paleontology","Taxonomy","Zoology"]
doi:10.7717/peerj.1778
47 downloads
288 views

A profound understanding of the influence of trackmaker anatomy, foot movements and substrate properties is crucial for any interpretation of fossil tracks. In this case study we analyze variability of footprint shape within one large theropod (T3), one medium-sized...

["Paleontology"]
doi:10.7287/peerj.preprints.2004v1
52 downloads
411 views

Pleurocystitid rhombiferans are among the most unusual echinoderms whose mode of life has been long debated. These echinoderms are usually interpreted as vagile epibenthic echinoderms, moving over the sea bottom by means of a flexible stem. Although their life...

["Ecology","Evolutionary Studies","Paleontology"]
doi:10.7717/peerj.1820
78 downloads
328 views

The hypotheses about the origin of the primitive amniotic tarsus are very speculative. Early studies argued that the origin of the astragalus, one of the largest proximal bones in the tarsus of basal amniotes, was produced by either the fusion of two, three, or...

["Evolutionary Studies","Paleontology"]
doi:10.7287/peerj.preprints.1952v2
96 downloads
525 views

The Drimolen Palaeocave System Main Quarry deposits (DMQ) are some of the most prolific hominin and primate-bearing deposits in the Fossil Hominids of South Africa UNESCO World Heritage Site. Discovered in the 1990s, excavations into the DMQ have yielded a demographically...

["Anthropology","Paleontology"]
doi:10.7717/peerj.1941
321 downloads
1,244 views

The cranial and postcranial anatomy of the basal hadrosaurid dinosaur Eotrachodon orientalis, from the uppermost Santonian of southern Appalachia (southeastern U.S.A.), is described in detail. This animal is the only known pre-Campanian non-lambeosaurine hadrosaurid,...

["Paleontology","Taxonomy","Zoology","Histology"]
doi:10.7717/peerj.1872
177 downloads
666 views

A second species of Yuanansuchus, Y. maopingchangensis, is erected for new temnospondyl material from the Maopingchang site, Yuanan County, Hubei Province, China. These specimens are from the same horizon that produced Y. laticeps, the type species. Y. maopingchangensis...

["Paleontology"]
doi:10.7717/peerj.1903
91 downloads
287 views

Aetosaurs are some of the most common fossils collected from the Upper Triassic Chinle Formation of Arizona, especially at the Petrified Forest National Park. Four partial skeletons collected from the park from 2002 through 2009 represent the holotype and referred...

["Paleontology"]
doi:10.7287/peerj.preprints.1924v1
245 downloads
1,126 views

Definitive therizinosaurid cranial materials are exceptionally rare, represented solely by an isolated braincase and tooth in the North American taxon Nothronychus mckinleyi, the remarkably complete skull of the Asian taxon Erlikosaurus andrewsi, and the lower...

["Paleontology","Taxonomy"]
doi:10.7717/peerj.1885
20 downloads
149 views

In this paper we describe fossil conifer branches discovered in the Mesaverde Group, Williams Fork Formation in northeastern Utah, along Snake John Reef. Fossil conifers from the Campanian of northeastern Utah have not been previously studied, despite their common...

["Paleontology","Plant Science"]
doi:10.7287/peerj.preprints.1862v1
343 downloads
1,428 views

Two extremely-long necked elasmosaurids, AMNH 1495, holotype of Hydralmosaurus serpentinus, and AMNH 5835, previously referred to H. serpentinus, are here reviewed in detail. Unique features of the cervical vertebrae, which are only present on elasmosaurids from...

["Biogeography","Paleontology","Taxonomy"]
doi:10.7717/peerj.1777
266 downloads
1,590 views

Despite the increasing number of exceptional feathered fossils discovered in the Late Jurassic and Cretaceous of northeastern China, representatives of Ornithurae, a clade that includes comparatively-close relatives of crown clade Aves (extant birds) and that clade,...

["Biodiversity","Paleontology","Zoology"]
doi:10.7717/peerj.1765
137 downloads
642 views

Stegodons are a commonly recovered extinct proboscidean (elephants and allies) from the Pleistocene record of Southeast Asian oceanic islands. Estimates on when stegodons arrived on individual islands and the timings of their extinctions are poorly constrained...

["Biogeography","Paleontology"]
doi:10.7717/peerj.1788
61 downloads
331 views

Deposits spanning the Radotruncana calcarata Taxon Range Zone at the Postalm section, Northern Calcareous Alps (Austria) are examined quantitatively for foraminiferal assemblages, especially the planktonic group. This study focuses on establishing a high resolution...

["Ecology","Marine Biology","Paleontology"]
doi:10.7717/peerj.1757

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