534 Projects

A project is a themed assortment of media and specimens. 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. Examples of projects could include the 3D data used in a single research paper or a collections digitization project. 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 MicroCT scans of an iodine stained prenatal rabbit The datasets herein represent a pilot study involving iodine staining and subsequent µCT scanning of a prenatal lagomorph. The specimen used is <i>Oryctolagus cuniculus</i> (SNG 17032), 57.8 mm long (from dorsal part of head to tail as measured from the µCT scans), collected in 1908, and was preserved in formalin. We used a preprepared 1% solution of Lugol’s iodine. This solution stained the specimen over the course of almost three months, and was exchanged every two weeks, or whenever the staining solution became clear rather than dark brown. The amount of penetration visible in the µCT scans of the whole specimen after 5 weeks and 2 days extends to a few millimeters into the specimen. After 7 weeks more penetration is visible, extending almost fully to the interior of the specimen except for parts of the heart, liver, and other deep structures in this area. After 11 weeks and 2 days, only a small part near the posterior liver and nearby area is not fully penetrated by the stain. The contrast between tissues is sufficient to see the majority of the internal anatomy after 11 weeks. 3 1
Display all details of Osteology and digital reconstruction of the skull of the early tetrapod Whatcheeria deltae The Early Carboniferous stem tetrapod Whatcheeria deltae is among the earliest-branching limbed tetrapods represented by multiple near-complete specimens, making it an important taxon in understanding the vertebrate water-to-land transition. However, all preserved skulls of Whatcheeria suffer from post-mortem crushing and lateral compression, which has made cranial reconstruction problematic. In this study, computed tomography data of three Whatcheeria specimens were segmented using visualization software to digitally separate each individual skull bone from matrix. Digital methods were used to repair and retrodeform the bones and produce the first complete three-dimensional skull reconstruction of Whatcheeria, revealing that this taxon had one of the narrowest skulls of any known early tetrapod, a gap between the nasals, and significant overlap of the lacrimal onto the nasal and prefrontal. We provide a revised description of the cranial and lower jaw anatomy of Whatcheeria based on CT data, focusing on sutural morphology and previously unknown anatomical details. Sutural morphology is used to infer loading regime in the skull during feeding and suggests the skull of Whatcheeria was well-adapted to resist stresses induced by biting large prey with its enlarged anterior fangs. Rawson, James 4 3
Display all details of MCZ - oVert 508 448
Display all details of Ramadapis sahnii New sivaladapid primate from Lower Siwalik deposits surrounding Ramnagar (Jammu and Kashmir State), India 3 1
Display all details of EVOLUTIONARY HOMOLOGY IN THE FIN-TO-LIMB TRANSITION: EVALUATING THE MORPHOLOGY OF FORAMINA IN A LATE DEVONIAN HUMERUS FROM THE CATSKILL FORMATION, CLINTON COUNTY, PENNSYLVANIA The shift from life in the water to life on land is regarded as a key transition in vertebrate evolution. This transition in tetrapodomorph vertebrates is marked by a number of morphological shifts, including, but not limited to, the evolution of a neck (Daeschler et al., 2006, Shubin et al., 2015), distinct digits (Coates and Clack, 1990, Boisvert et al., 2008), and weightbearing limbs (Coates and Clack, 1990, Niedzwiedzki et al., ́ 2010, Clack, 2012, Pierce et al., 2012, 2013, Hohn-Schulte et al., 2013, Molnar et al., 2018). The forelimb, specifically the humerus, has been highlighted in this transition because of its reorientation in the evolution of a weight-bearing limb (Coates and Clack, 1990, Lebedev and Coates, 1995, Coates, 1996, Shubin et al., 2004, 2006, Boisvert, 2009, Sanchez et al., 2014, Daeschler and Downs, 2018, Downs et al., 2018). Early in tetrapodomorph evolution, a novel humeral feature emerged: the ventral ridge (Shubin et al., 2004, Clack, 2012, Sanchez et al., 2014, Downs et al., 2018). The ventral ridge is an ossification resulting from the relocation of humeral musculature (Clack, 2012, Molnar et al., 2018), and it commonly has many foramina in its proximal and/or distal surfaces (Shubin et al., 2004, 2006, Boisvert, 2009, Daeschler and Downs, 2018, Downs et al., 2018, Kamska et al., 2018). However, the morphology, function, and evolutionary history of these foramina have not been explored previously. ANSP 21350 (Shubin et al., 2004, Daeschler et al., 2009), an isolated left humerus from the Late Devonian of Pennsylvania, preserves both plesiomorphic and derived characteristics in the fin-to-limb transition (Ahlberg, 2011, Clack, 2012). The taxonomic and phylogenetic position of ANSP 21350 remains uncertain (Daeschler et al., 2009, Ahlberg, 2011, Clack, 2012), although its morphology remains unique and informative, particularly with respect to that of the ventral ridge. The ventral ridge in ANSP 21350 preserves five distinct foramina in conjunction with a tripartite entepicondylar foramen (Shubin et al., 2004). However as with other tetrapodomorphs, the internal morphology of the ventral ridge and the extent to which foramina anastomose in ANSP 21350 remains a mystery. Here, we reconstruct the internal morphology of ANSP 21350 using micro-computed tomography (µCT) scan data, and we present an evolutionary pathway for the ventral ridge foramina that incorporates the existing tetrapodomorph fossil record. 2 1
Display all details of Endocast structures are reliable proxies for the sizes of corresponding regions of the brain in extant birds 48 34
Display all details of NMHM Paleopathology Digital repository of paleopathological specimens from the National Museum of Health and Medicine 41 28
Display all details of Gecko feet 0 0
Display all details of Neogloboquadrina pachyderma and Uvigerina peregrina from the Gulf of Alaska (IODP 341; U1419) Payne and Belanger, 2021. Enhanced carbonate dissolution associated with deglacial dysoxic events in the subpolar North Pacific. Paleoceanography and Paleoclimatology. Here we use volume density (ρV) measurements as a metric of size-normalized weights for Neogloboquadrina pachyderma, a planktonic foraminifer, from upper OMZ and abyssal depth sites in the Gulf of Alaska over the past ~20,000 years to test for covariation between carbonate preservation and OMZ intensity. We find that dissolution of N. pachyderma is most intense at the upper OMZ site where oxygenation is generally lower than at the abyssal site. We also examine Uvigerina peregrina, a benthic foraminifer, at the upper OMZ site and find that the lowest ρV measurements in both taxa occur during deglacial and early Holocene dysoxic events. We use computed tomography images to confirm that changes in ρV are related to shell thickness, observe dissolution features, and test for growth influences on ρV. Further, we use stepwise selection of multiple regression models in which co-registered environmental proxies are potential predictors of ρV and find that the best supported models retain negative associations between ρV and the concentration of redox sensitive metals and the relative abundance of dysoxia-tolerant and opportunistic benthic foraminifera, indicating that low ρV is associated with low-oxygen conditions and pulsed availability of organic matter at the seafloor contribute to low ρV. Taken together, our results suggest the primary driver of carbonate dissolution here is related to organic carbon respiration at the seafloor. This highlights the importance of metabolic dissolution in understanding the inorganic carbon cycle and the role regions with high organic carbon export, such as OMZs, can have as CO2 sources as metabolic dissolution intensifies. 0 0
Display all details of Earliest Palaeocene purgatoriids and the initial radiation of stem primates All specimens were scanned as part of Wilson et al. (2021). See link to publication below. 10 8
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