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zoology

Background. Cryptodires represent the largest group of living turtles (Testudines) with a wide range of habitat preferences from terrestrial through freshwater to marine. Their origin and early evolution can be traced back to the extinct pancryptodires of the Middle...

["Biodiversity","Evolutionary Studies","Paleontology","Taxonomy","Zoology"]
doi:10.7287/peerj.preprints.1009v1

Background. While Computed Tomography scanning is a powerful non-invasive tool for the study of paleoneurology, the neuroanatomy of turtles remains unexplored in comparison to other higher taxa. I herein present data on the morphology of intracranial structures...

["Neuroscience","Paleontology","Zoology","Radiology and Medical Imaging"]
doi:10.7287/peerj.preprints.1008v1
4 downloads
19 views

Geographical patterns in body size have been described across a wide range of species, leading to the development of a series of fundamental biological rules. However, shape variables are less well-described despite having substantial consequences for organismal...

["Biogeography","Ecology","Entomology","Evolutionary Studies","Zoology"]
doi:10.7287/peerj.preprints.998v1
15 downloads
58 views

Background. Phrynops present four valid species, including P. geoffroanus that might represents a complex of cryptic species. Here, we provide a preliminary analysis of the taxonomy and phylogenetic affinities within Phrynops, with special reference to the taxonomic...

["Biodiversity","Evolutionary Studies","Molecular Biology","Taxonomy","Zoology"]
doi:10.7287/peerj.preprints.986v1
69 downloads
86 views

Rothschild (2013) suggested that many of the facial and postcranial scars in tyrannosaurid specimens are in fact caused by claws of the other tyrannosaurids. However, the evidences suggested by Rothschild (2013) are very weak. Tooth marks can have very different...

["Animal Behavior","Ecosystem Science","Paleontology","Zoology","Pathology"]
doi:10.7287/peerj.preprints.980v1
55 downloads
44 views

The American brine shrimp Artemia franciscana is invasive in the Mediterranean region where it has displaced native species (the sexual A. salina, and the clonal A. parthenogenetica) from many salt pond complexes. Artemia populations are parasitized by numerous...

["Biodiversity","Ecology","Parasitology","Zoology"]
doi:10.7287/peerj.preprints.975v1
28 downloads
25 views

Background. Crown-Pleurodira (i.e.: Cheloides and Pelomedusoides) possess a side-necked retraction mode with specialized cervical vertebrae (CV) anatomy. Moreover, there are distinctive ecological features among its lineages, as the convergent long neck in species...

["Paleontology","Zoology"]
doi:10.7287/peerj.preprints.973v1
34 downloads
117 views

The present study assesses swimbladder dynamics in natural occurring sardine, Sardina pilchardus, populations with the aim to examine whether this is affected by bathymetric positioning and the physiological state of the individuals. To do so, swimbladder size...

["Aquaculture, Fisheries and Fish Science","Marine Biology","Zoology"]
doi:10.7717/peerj.892
146 downloads
508 views

Whale sharks Rhincodon typus are globally threatened, but a lack of biological and demographic information hampers an accurate assessment of their vulnerability to further decline or capacity to recover. We used laser photogrammetry at two aggregation sites to...

["Conservation Biology","Ecology","Marine Biology","Zoology"]
doi:10.7717/peerj.886
567 downloads
158 views

Sloths are considered to have one of the lowest mass-specific metabolic rates of any mammal and, in tandem with a slow digestive rate, have been theorized to have correspondingly low rates of ingestion. Here, we show in a study conducted over five months, that...

["Animal Behavior","Ecology","Zoology"]
doi:10.7717/peerj.875
55 downloads
250 views

Reports on reddish carotenoid-based ornaments in female three-spined sticklebacks (Gasterosteus aculeatus) are few, despite the large interest in the species’ behaviour, ornamentation, morphology and evolution. We sampled sticklebacks from 17 sites in north-western...

["Animal Behavior","Aquaculture, Fisheries and Fish Science","Evolutionary Studies","Zoology"]
doi:10.7717/peerj.872
117 downloads
111 views

It is important to quantify patterns of morphological diversity to enhance our understanding of variation in ecological and evolutionary traits. Here, we present a quantitative analysis of morphological diversity in a family of small mammals, the tenrecs (Afrosoricida,...

["Evolutionary Studies","Zoology"]
doi:10.7287/peerj.preprints.811v2
35 downloads
48 views

A biosurvey was conducted in Samendu Lake and its surrounding wetlands of Eastern Himalayan Hill region of Mirik in Darjeeling in West Bengal, India. In the study, endemic and locally rare bird species Zapornia bicolor (Walden, 1872) was studied with point transect...

["Animal Behavior","Biodiversity","Conservation Biology","Ecosystem Science","Zoology"]
doi:10.7287/peerj.preprints.925v3
71 downloads
299 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
61 downloads
151 views

The study of animal movement commonly requires the segmentation of continuous data streams into individual strides. The use of forceplates and foot-mounted accelerometers readily allows the detection of the foot-on and foot-off events that define a stride. However,...

["Animal Behavior","Bioengineering","Veterinary Medicine","Zoology","Computational Science"]
doi:10.7717/peerj.783

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