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zoology
2 downloads

Torsional loading is a common feature of skeletal biomechanics during vertebrate flight. The importance of resisting torsional loads is best illustrated by the convergence of wing bone structure (e.g., long with thin walls) across extant bats and birds. Whether...

["Zoology","Anatomy and Physiology","Histology"]
doi:10.7717/peerj.823
1 download

Background. Neochelys franzeni (Schelich, 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:10.7287/peerj.preprints.874v1
8 downloads

Background. A new podocnemidid taxon from the Adamantina Formation (Campanian to Maastrichtian), Bauru Group - Paraná Basin (southeastern Brazil) is presented. Some multifragmented specimens were discovered near 30 years ago, in the region of Álvarez Machado (State...

["Paleontology","Zoology"]
doi:10.7287/peerj.preprints.873v1
90 downloads
287 views

In August 2013, we observed a high incidence (44%) of synchronous bands of reduced melanin (a type of fault bar we have termed “pallid bands”) across the rectrices of juvenile Grasshopper Sparrows (Ammodrammus savannarum) captured near El Reno, Oklahoma. Earlier...

["Conservation Biology","Ecology","Zoology"]
doi:10.7717/peerj.814
19 downloads
76 views

Rapid morphological change has been shown in rodent populations on islands, including endemic deer mice (Peromyscus maniculatus subspp.) on the California Channel Islands. Surprisingly, most of these changes were towards a smaller size. Black rats were introduced...

["Biodiversity","Conservation Biology","Ecology","Evolutionary Studies","Zoology"]
doi:10.7717/peerj.812
7 downloads
7 views

Background. Studies on the geographic variation of the matamata, Chelus fimbriatus, have previously demonstrated differences between carapace shape, plastral pigmentation and the ventral coloration of the neck between populations from the Amazon and Orinoco river...

["Biodiversity","Taxonomy","Zoology"]
doi:10.7287/peerj.preprints.870v1
8 downloads
7 views

Little is known about mechanisms promoting the diversity of antipredation strategies found in nature. In this study I explore how habitat heterogeneity may have profound effects on predator–prey communication. Habitat heterogeneity inevitably increases background...

["Animal Behavior","Biodiversity","Ecology","Evolutionary Studies","Zoology"]
doi:10.7287/peerj.preprints.865v1
33 downloads
64 views

Background. Previous quantitative studies about Bauruemys elegans (Suárez, 1969) shell variation, as well as the taphonomy interpretation of its type locality, have suggested that all specimens collected in this locality may have belonged to the same population....

["Paleontology","Zoology"]
doi:10.7287/peerj.preprints.859v1
78 downloads
140 views

Background. The origin of turtles, their earliest evolution and the homologies of the elements building their shell are still enigmatic and remain an object of ongoing discussion and research. Although the oldest fully shelled turtle – Proterochersis robusta from...

["Evolutionary Studies","Paleontology","Zoology"]
doi:10.7287/peerj.preprints.858v1
98 downloads
483 views

Marsupials or metatherians are a group of mammals that are distinct in giving birth to young at early stages of development and in having a prolonged investment in lactation. The group consists of nearly 350 extant species, including kangaroos, koala, possums,...

["Biodiversity","Biogeography","Evolutionary Studies","Taxonomy","Zoology"]
doi:10.7717/peerj.805
119 downloads
184 views

In this paper, I comment on Porfiri et al. (2014), "Juvenile specimen of Megaraptor (Dinosauria, Theropoda) sheds light about tyrannosauroid radiation". Though Porfiri et al. provided numerous coelurosaurian characters on the Megaraptor specimen, their referral...

["Evolutionary Studies","Paleontology","Taxonomy","Zoology"]
doi:10.7287/peerj.preprints.851v1
136 downloads
160 views

In this paper, I comment on Larson's 2013 paper "The case for Nanotyrannus". All the osteological differences proposed by Larson (2013) seem to be due to ontogeny and individual variation. Therefore, Larson's claim that "Nanotyrannus lancensis" is not a juvenile...

["Evolutionary Studies","Paleontology","Taxonomy","Zoology"]
doi:10.7287/peerj.preprints.852v1
49 downloads
125 views

The taxon Beloniformes represents a heterogeneous group of teleost fishes that show an extraordinary diversity of jaw morphology. I present new anatomical descriptions of the jaw musculature in six selected beloniforms and four closely related species. A reduction...

["Taxonomy","Zoology"]
doi:10.7717/peerj.769
87 downloads
209 views

The Permo-Triassic archosauromorph record is crucial to understand the impact of the Permo-Triassic mass extinction on the early evolution of the group and its subsequent dominance in Mesozoic terrestrial ecosystems. However, the Permo-Triassic archosauromorph...

["Biogeography","Evolutionary Studies","Paleontology","Taxonomy","Zoology"]
doi:10.7717/peerj.776
29 views

Data are the foundation of empirical research, yet all too often the datasets underlying published papers are unavailable, incorrect, or poorly curated. This is a serious issue, because future researchers are then unable to validate published results or reuse data...

["Evolutionary Studies","Taxonomy","Zoology","Science Policy"]
doi:10.7287/peerj.preprints.832v1

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