Projects
1254 Projects

Media are grouped by projects created by users. Projects tend to contain media tied together by a theme. A project might represent the dataset for a single peer-reviewed paper, the results of a collections digitization project, or data for a digital lesson plan.

Projects can be used to share media ownership and access between project members, and projects can also be used to publish assortments of media and specimens for access and discovery by the public. If you want to share media ownership and access with multiple users across multiple projects, consider creating a user team. Projects can be managed by teams, and users with access to that team also gain access to any projects managed by that team.

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Title Description Team Creator Media Objects
Display all details of Dental pathology in Chondrichthyes represents definitive documentation of gemination outside Mammalia Gemination is a rare tooth pathology that results from a partial division of a single tooth bud, producing a bifurcated crown and pulp cavity. The etiological factors that contribute to gemination are not well understood and a variety of causes have been proposed, including developmental, genetic, physiological, environmental, morphological, and even behavioral factors. Here we report on tooth gemination in two species of Cenozoic sharks Otodus megalodon (NCSM 33639) and Carcharhinus leucas (NCSM 33640 and NCSM 33641), which is to our knowledge, the first definitive documentation of this double tooth pathology outside of Mammalia. We describe the gross and internal morphology of these teeth and compare these data against non-pathological teeth from their respective species. Nano-CT scans suggest the dental abnormalities in these specimens are most similar to gemination, indicated by a singular bifid crown in both, with a single, asymmetrically oriented pulp cavity in C. leucas and a doubling of main ascendant canals in O. megalodon. These results suggest that tooth gemination may occur across all vertebrate clades and highlights the importance of documenting and discriminating dental abnormalities in extant and extinct taxa. More research is needed to link paleobiological and/or paleoenvironmental factors to gemination in polyphyodont taxa. Miller, Harrison 3 3
Display all details of Regina feeding adaptation project 0 0
Display all details of Fetal rorqual respiratory plugs MRI and CT on fetal specimens of four species of rorquals (Balaenoptera musculus, Balaenoptera physalus, Megaptera novaeangliae, Balaenoptera acutorostrata) with focus on oral and nasal plugs. 5 5
Display all details of Long forgotten: Eunice woodwardi Baird, 1869 (Annelida, Eunicidae) revisited, with an insight on internal anatomy Eunice woodwardi Baird, 1869, originally described from the Ría de A Coruña (NW Iberian Peninsula), has been overlooked and never reported from the Atlantic coast of Spain after original description and the subsequent redescription of the holotype. In the present study, we revised comparatively the holotype, newly collected specimens of this species and specimens identified as Eunice vittata (Delle Chiaje, 1829) from western Mediterranean Sea. The validity of E. woodwardi is supported and previous descriptions are complemented after a throughout study of the external morphology by means of light compound microscopy and scanning electron microscopy, and that of the internal anatomy by histological sectioning and micro-computed tomography. The presence of eyes, nuchal organs, dorsal and ventral ciliary organs on parapodial cirri and paired nephridia in most segments is confirmed in E. woodwardi; the digestive tract is clearly regionalized and divided into pharynx, oesophagus, stomach, fore, mid- and hind intestine. The presence of E. woodwardi in the Ría de Ferrol is also reported, and we suggest that previous records of E. vittata in NW Iberian Peninsula should be reviewed. Eunice woodwardi is distinguished by a set of characters such as having non-articulated and non-constricted cephalic appendages, the maxillary formula, the range of branchial distribution, maximum number of branchial filaments, number of limbate and compound falciger chaetae per parapodium, the presence of an apical mucro in the guard of falciger chaetae blades and the number of teeth in pectinate chaetae. Epibiont Ciliophora on branchiae are also reported. Two zip files of 2D images of Eunice woodwardi. 2 2
Display all details of Ophiuroids vertebrae 12 12
Display all details of Micro-CT and STLs for Bicknell et al. Papers in Palaeontology Micro-CT DICOM stack and STLs associated with this work. Bicknell, Russell 2 1
Display all details of Australopithecus sediba Scan data related to Australopithecus sediba from the site of Malapa, South Africa 143 98
Display all details of Convergent Evolution In Dippers (Aves, Cinclidae): The Only Wing-propelled Diving Songbirds Smith, N. A., K. L. Koeller, J. A. Clarke, D. T. Ksepka, J. S. Mitchell, A. Nabavizadeh, R. C. Ridgely, and L. M. Witmer. 2021. Convergent evolution in dippers (Aves, Cinclidae): the only wing-propelled diving songbirds. Anatomical Record. Of the more than 6,000 members of the most speciose avian clade, Passeriformes (perching birds), only the five species of dippers (Cinclidae, Cinclus) use their wings to swim underwater. Among non-passerine wing-propelled divers (alcids, diving petrels, penguins, and plotopterids), convergent evolution of morphological characteristics related to this highly derived method of locomotion have been well documented, suggesting that the demands of this behavior exert strong selective pressure. However, despite their unique anatomical attributes, dippers have been the focus of comparatively few studies and potential convergence between dippers and non-passeriform wing-propelled divers has not been previously examined. In this study, a suite of characteristics that are shared among many wing-propelled diving birds were identified and the distribution of those characteristics across representatives of all clades of extant and extinct wing-propelled divers were evaluated to assess convergence. Putatively convergent characteristics were drawn from a relatively wide range of sources including osteology, myology, endocranial anatomy, integument, and ethology. Comparisons reveal that whereas non-passeriform wing-propelled divers do in fact share some anatomical characteristics putatively associated with the biomechanics of underwater ‘flight’, dippers have evolved this highly derived method of locomotion without converging on the majority of concomitant changes observed in other taxa. Changes in the flight musculature and feathers, reduction of the keratin bounded external nares and an increase in subcutaneous fat are shared with other wing-propelled diving birds, but endocranial anatomy shows no significant shifts and osteological modifications are limited. Muscular and integumentary novelties may precede skeletal and neuroendocranial morphology in the acquisition of this novel locomotory mode, with implications for understanding potential biases in the fossil record of other such transitions. Thus, dippers represent an example of a highly derived and complex behavioral convergence that is not fully associated with the anatomical changes observed in other wing-propelled divers, perhaps owing to the relative recency of their divergence from non-diving passeriforms. 6 3
Display all details of InSegtCone InSegtCone: Interactive Segmentation of crystalline Cones in compound eyes Pierre Tichit, Tunhe Zhou, Hans Martin Kjer, Vedrana Andersen Dahl, Anders Bjorholm Dahl, Emily Baird bioRxiv 2020.12.15.422850; doi: https://doi.org/10.1101/2020.12.15.422850 4 2
Display all details of Archaeological Creative Tank Jacopo Niccolò Cerasoni 2 1
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