Preprints (not yet peer-reviewed)

257 downloads
552 views

Crocodyliformes have undergone few modifications in their morphology since they have emerged. The change in the position of the choana was important during the evolutionary history of this group. Such character is relevant in the phylogenetic position of many crocodyliforms....

["Paleontology"]
doi:10.7287/peerj.preprints.26956v1
697 downloads
1,402 views

It is widely accepted that birds evolved from theropod dinosaurs, and few paleontologists disagree preferring a more ancient split of the avian and dinosaur lineages. The difference in digestive physiology between members of the theropod and crocodile lineages,...

["Evolutionary Studies","Paleontology","Zoology","Anatomy and Physiology"]
doi:10.7287/peerj.preprints.26902v2
55 downloads
225 views

We present two cases of study of ontogenetic allometry in outlines of bivalves using longitudinal data, a rarity among fossils, based on the preserved post-larval record of shells. The examples are two infaunal burrowing bivalves of the southern South America,...

["Evolutionary Studies","Marine Biology","Paleontology","Zoology"]
doi:10.7287/peerj.preprints.26892v1
137 downloads
466 views

Background. Yunnanolepidoids constitute either the basal-most consecutive segments or the most primitive clade of antiarchs, a highly diversified jawed vertebrate group from the Silurian and Early Devonian periods. Although the general morphology of yunnanolepidoids...

["Evolutionary Studies","Paleontology","Zoology"]
doi:10.7287/peerj.preprints.26867v1
296 downloads
765 views

Background. The phylogenetic placement of Cretaceous marine turtles, especially Protostegidae, is still under debate among paleontologists. Whereas protostegids were traditionally thought to be situated within the clade of recent marine turtles (Chelonioidea),...

["Evolutionary Studies","Paleontology"]
doi:10.7287/peerj.preprints.26863v1
59 downloads
209 views

Acquiring data on the occurrences of many types of difficult to identify objects are often still made by human observation, e.g. in biodiversity and paleontologic research. Existing computer counting programs used to record such data have various limitations, including...

["Biodiversity","Bioinformatics","Ecology","Paleontology"]
doi:10.7287/peerj.preprints.26836v1
565 downloads
1,154 views

During the Cretaceous period, North America was divided into two landmasses, the eastern Appalachia and western Laramidia. Recent research on several sites scattered across the eastern margin of North America has allowed for the analysis of vertebrate faunas from...

["Biogeography","Paleontology","Taxonomy","Zoology"]
doi:10.7287/peerj.preprints.26829v1
40 downloads
173 views

Despite an estimated molecular divergence date of 40 million years (middle Eocene) between wombats and their closest living relative, the koala, the fossil record of wombats is poor. The two oldest described wombats, Nimbavombatus boodjamullensis and Rhizophascolonus...

["Evolutionary Studies","Paleontology","Taxonomy"]
doi:10.7287/peerj.preprints.26828v1
62 downloads
151 views

The ‘Lessepsian invasion’ – the massive influx of Indo-Pacific biota into the Mediterranean Sea via the Suez Canal – is the largest marine biological invasion. The lack of data on pre-invasion community composition, however, severely impairs our understanding to...

["Ecology","Marine Biology","Paleontology","Environmental Impacts"]
doi:10.7287/peerj.preprints.26762v1
125 downloads
494 views

The amphicyonid, or “bear-dog,” Paradaphoenus was a small-bodied, hypercarnivorous carnivoran that lived in North America during the Oligocene. Specimens of Paradaphoenus are rare, in part owing to the common inaccurate referral of specimens to the abundant canid...

["Biogeography","Paleontology"]
doi:10.7287/peerj.preprints.26735v1
94 downloads
149 views

Pavocosa sp. (Lycosidae) burrows found in an open sparsely vegetated area on the edge of the saline lake the “Gran Salitral”, in central Argentina, are described. Burrows were studied by capturing the occupant and casting them with dental plaster. The hosting sediments...

["Animal Behavior","Paleontology"]
doi:10.7287/peerj.preprints.26674v1
89 downloads
139 views

The Messinian stromatolites belonging to the Terminal Carbonate Complex unit, from the northern sector of the Bajo Segura Basin (CAM section, Sierra del Colmenar, SE Spain) have been studied. To understand the direct relationship between the morphologies of the...

["Marine Biology","Paleontology"]
doi:10.7287/peerj.preprints.26648v1
157 downloads
376 views

Large cylindrical structures with a dominantly laminated fill occurring in the loess-paleosol sequence of the late Miocene Cerro Azul Formation (central Argentina) are interpreted as mammal burrows. A total of 115 burrow fills from three localities were measured....

["Paleontology"]
doi:10.7287/peerj.preprints.26632v1
129 downloads
212 views

One of the first endocasts of a dipnoan (lungfish) to be realised was that of the Upper Devonian taxon Chirodipterus australis. This early interpretation was based on observations of the shape of the cranial cavity alone and was not based on a natural cast or 'steinkern'...

["Evolutionary Studies","Paleontology"]
doi:10.7287/peerj.preprints.26591v1
155 downloads
311 views

Background. The pycnodontiform fish Pycnodus is one of the representatives of the highly diverse actinopterygian fish fauna from the early Eocene Bolca Lagerstätte, representing one of the youngest and thus last occurrences of the extinct neopterygian clade Pycnodontiformes....

["Ecology","Evolutionary Studies","Paleontology","Taxonomy"]
doi:10.7287/peerj.preprints.26582v1
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