Find research datasets worth reusing
Search datasets from major research repositories and use ShareScore to quickly assess how well each record supports discovery, access, and reuse.
249
datasets available to search
ShareScore release 0.9.0
Dataset results
249 results for “archosaurs”
Figure 1 in Braincase evolution in suchian archosaurs (Reptilia: Diapsida): evidence from the rauisuchian Batrachotomus kupferzellensis
Figure 1. Batrachotomus kupferzellensis Gower. Ventral part of braincase of SMNS 80260 in posterior view. Scale bar = 30 mm mpr = median pharyngeal recess.
Figure 6 in New data on the braincase of the aetosaurian archosaur (Reptilia: Diapsida) Stagonolepis robertsoni Agassiz
Figure 6. Summary of hypothesis of suchian braincase evolution, based on phylogeny presented in Fig. 5B and morphological and phylogenetic evidence presented in text. Key caveats include the omission of ornithosuchians and Gracilisuchus stipanicicorum from consideration. Schematic figures depict the left otic region in lateral view. Some proposed braincase synapomorphies are shown on some branches – for a broader context and consideration of more characters, see Gower (2002b). Sphenosuchus redrawn from Walker (1990), Crocodylus redrawn from Gower & Weber (1998). For Crocodylus, only the detail of the ventral ramus of the opisthotic is shown. The metotic foramen does not exist because the metotic fissure is subdivided so that the external foramina for the vagus nerve (X) lies far posterior to the ventral ramus of the opisthotic. External foramina for the hypoglossal nerve (XII) are indicated by solid black dots. cr = cochlear recess; lcs = loop closure suture of ventral ramus of the opisthotic; pr = prootic. Diagrams not drawn to scale.
Figure 10 in Braincase evolution in suchian archosaurs (Reptilia: Diapsida): evidence from the rauisuchian Batrachotomus kupferzellensis
Figure 10. Strict consensus tree of five most parsimonious trees (MPTs) retrieved by parsimony analysis of data in Table 1. These MPTs have a length of 37 steps, a consistency index of 0.811, and a retention index of 0.889. Numbers above and below nodes represent decay indices and bootstrap proportions, respectively. Node A represents Crurotarsi (and all crown-group archosaurs here, in the absence of any ornithodiran taxa), node B represents Crocodylomorpha. The two nodes marked with medium thickness internal branches indicate that some (but not all) of the shortest trees not including those nodes are a significantly worse fit to the data than are the unconstrained MPTs (as measured by the Templeton test; P £ 0.1). The single node (B) marked with the thickest internal branch indicates that all of the shortest trees not including that node are a significantly worse fit to the data than are the unconstrained MPTs. Constrained shortest trees lacking other nodes (thin internal branches) are not a significantly worse fit to the data.
Endocranial development in non-avian dinosaurs reveals an ontogenetic brain trajectory distinct from extant archosaurs
Open the record for dataset details and reuse information.
Data from: Feeding habits of the Middle Triassic pseudosuchian Batrachotomus kupferzellensis from Germany and palaeoecological implications for archosaurs
<p>Bite traces on fossil bones are key to deciphering feeding ecology and trophic interactions of vertebrate past ecosystems. However, similarities between traces produced by different carnivorous taxa with similar dentitions and misidentifications due to equifinality hinder confident identifications of the bite makers. Here, we correlate bite traces with macroscopic wear and microanatomy of the teeth of the pseudosuchian archosaur <i>Batrachotomus kupferzellensis</i> from the Triassic Lower Keuper fossil lagerstätten (southern Germany), untangling its feeding habits and shedding light on the bite traces generated by ziphodont teeth (teeth with serrated carinae). Individually, bite traces reflect tooth morphology, whereas composite bite traces and their frequency are related to feeding behaviour and explain tooth macroscopic wear and microanatomy. Therefore the identification of the bite maker is possible by analysing composite bite traces, their location on bones, and their relative abundance. In addition, tooth macroscopic wear and microanatomy are proven as independent lines of evidence of feeding ecology. Comparing bite traces on fossil and present-day bone assemblages, we observe that bone modifications by the crocodylomorph lineage (from Triassic pseudosuchian archosaurs to extinct and extant crocodylians) are strikingly similar, including taxa with and without ziphodont teeth. Such a set of features differs from bone modification assemblages produced by taxa with similar ziphodont teeth outside the pseudosuchian lineage (such as theropod dinosaurs and the Komodo monitor), suggesting a phylogenetic signal in feeding ecology among saurian reptiles. --</p>
Data from: Extreme neck elongation evolved despite strong developmental constraints in bizarre Triassic reptiles – implication for neck modularity in archosaurs
<p>The Triassic radiation of vertebrates saw the emergence of the modern vertebrate groups, as well as numerous extinct animals exhibiting conspicuous, unique anatomical characteristics. Among these, members of Tanystropheidae (Reptilia: Archosauromorpha) displayed cervical vertebral elongation to an extent unparalleled in any other vertebrate. Tanystropheids were exceptionally ecologically diverse and had a wide spatial and temporal distribution. This may have been related to their neck anatomy, yet its evolution and functional properties remain poorly understood. We used geometric morphometrics to capture the intraspecific variation between the vertebrae comprising the cervical column among early archosauromorphs, to trace the evolutionary history of neck elongation in these animals. Our results show that the cervical series of these reptiles can be divided into modules corresponding to those of extant animals. Tanystropheids achieved neck elongation through somite elongation and a shift between cervical and thoracic regions, without presacral vertebrae count increase - contrary to crown archosaurs. This suggests a peculiar developmental constraint that strongly affected the evolution of tanystropheids. The data obtained just at the base of the archosauromorph phylogenetic tree is crucial for further studies on the modularity of vertebral columns of not only Triassic reptile groups but extant and other extinct animals as well.</p>
Fig. 62 in Postcranial Osteology Of Azendohsaurus Madagaskarensis (?Middle To Upper Triassic, Isalo Group, Madagascar) And Its Systematic Position Among Stem Archosaur Reptiles
Fig. 62. Right fibula of Azendohsaurus madagaskarensis (FMNH PR 3813) in (A) proximal, (B) lateral,
Fig. 74 in Postcranial Osteology Of Azendohsaurus Madagaskarensis (?Middle To Upper Triassic, Isalo Group, Madagascar) And Its Systematic Position Among Stem Archosaur Reptiles
Fig. 74. The relationships of Allokotosauria found in the analyses of this study.
Fig. 8 in Postcranial Osteology Of Azendohsaurus Madagaskarensis (?Middle To Upper Triassic, Isalo Group, Madagascar) And Its Systematic Position Among Stem Archosaur Reptiles
Fig. 8. The reconstructed vertebral column of Azendohsaurus madagaskarensis.
Fig. 6 in Postcranial Osteology Of Azendohsaurus Madagaskarensis (?Middle To Upper Triassic, Isalo Group, Madagascar) And Its Systematic Position Among Stem Archosaur Reptiles
Fig. 6. Elements present in the holotype of Azendohsaurus madagaskarensis (UA 7-20-99-653).
Fig. 2 in Postcranial Osteology Of Azendohsaurus Madagaskarensis (?Middle To Upper Triassic, Isalo Group, Madagascar) And Its Systematic Position Among Stem Archosaur Reptiles
Fig. 2. Map of the location of the holotype locality of Azendohsaurus madagaskarensis.
Fig. 1 in Postcranial Osteology Of Azendohsaurus Madagaskarensis (?Middle To Upper Triassic, Isalo Group, Madagascar) And Its Systematic Position Among Stem Archosaur Reptiles
Fig. 1. Skeletal reconstruction of Azendohsaurus madagaskarensis.
Data from: The endocast of Euparkeria sheds light on the ancestral archosaur nervous system
<p>Understanding the evolution of the tetrapod brain is essential to trace the history of ecomorphological diversification of modern clades. While previous studies focused on the morphological transformation of the nervous system along the dinosaur-bird transition, little is known about the brain anatomy of archosauriformes and early archosaurs. Here, we describe the endocast of <em>Euparkeria</em> <em>capensis</em>, a small-bodied, terrestrial archosauriform closely related to Archosauria, with the goal of resolving the current uncertainties surrounding the ancestral condition of the archosaurian nervous system. The endocast of <em>Euparkeria</em> is sigmoidal, with large olfactory bulbs, an expanded cerebral hemisphere and an elongated flocculus. We suggest that this pivotal taxon was an active predator with a remarkable olfactory acuity. Overall, the endocast of <em>Euparkeria</em> resembles the ones observed in phytosaurs, crocodilians and early dinosaurs, implying that modern crocodilians retain an archosaurian plesiomorphic brain morphology.</p>
Automated analysis of bird head motion in unconstrained settings: A foundational study on semicircular canal evolution in archosaurs
Open the record for dataset details and reuse information.
Data from: Extreme neck elongation evolved despite strong developmental constraints in bizarre Triassic reptiles – implication for neck modularity in archosaurs
Open the record for dataset details and reuse information.
Widespread convergence towards functional optimisation in the lower jaws of crocodile-line archosaurs
Open the record for dataset details and reuse information.
Data from: The endocast of Euparkeria sheds light on the ancestral archosaur nervous system
Open the record for dataset details and reuse information.
Data from: Feeding habits of the Middle Triassic pseudosuchian Batrachotomus kupferzellensis from Germany and palaeoecological implications for archosaurs
Open the record for dataset details and reuse information.
Data from: The earliest bird-line archosaurs and the assembly of the dinosaur body plan
Open the record for dataset details and reuse information.
Data from: Joint histology in Alligator mississippiensis challenges the identification of synovial joints in fossil archosaurs and inferences of cranial kinesis
Archosaurs, like all vertebrates, have different types of joints that allow or restrict cranial kinesis, such as synovial joints and fibrous joints. In general, synovial joints are more kinetic than fibrous joints, because the former possess a fluid-filled cavity and articular cartilage that facilitate movement. Even though there is a considerable lack of data on the microstructure and the structure–function relationships in the joints of extant archosaurs, many functional inferences of cranial kinesis in fossil archosaurs have hinged on the assumption that elongated condylar joints are (i) synovial and/or (ii) kinetic. Cranial joint microstructure was investigated in an ontogenetic series of American alligators, Alligator mississippiensis. All the presumably synovial, condylar joints found within the head of the American alligator (the jaw joint, otic joint and laterosphenoid–postorbital (LS–PO) joint) were studied by means of paraffin histology and undecalcified histology paired with micro-computed tomography data to better visualize three-dimensional morphology. Results show that among the three condylar joints of A. mississippiensis, the jaw joint was synovial as expected, but the otherwise immobile otic and LS–PO joints lacked a synovial cavity. Therefore, condylar morphology does not always imply the presence of a synovial articulation nor mobility. These findings reveal an undocumented diversity in the joint structure of alligators and show that crocodylians and birds build novel, kinetic cranial joints differently. This complicates accurate identification of synovial joints and functional inferences of cranial kinesis in fossil archosaurs and tetrapods in general.
ScienceDex guides
Understand access before you commit
These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.