Projects
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 Dermochelys coriacea M-14943 3 1
Display all details of Nanger dama M-12386 2 1
Display all details of Petrosal morphology and cochlear function in Mesozoic stem therians Here we describe the bony anatomy of the inner ear and surrounding structures seen in three plesiomorphic crown mammalian petrosal specimens. Our study sample includes the triconodont Priacodon fruitaensis from the Upper Jurassic of North America, and two isolated stem therian petrosal specimens colloquially known as the Höövör petrosals, recovered from Aptian-Albian sediments in Mongolia. The second Höövör petrosal is here described at length for the first time. All three of these petrosals and a comparative sample of extant mammalian taxa have been imaged using micro-CT, allowing for detailed anatomical descriptions of the osteological correlates of functionally significant neurovascular features, especially along the abneural wall of the cochlear canal.The high resolution imaging provided here clarifies several hypotheses regarding the mosaic evolution of features of the cochlear endocast in early mammals. In particular, these images demonstrate that the membranous cochlear duct adhered to the bony cochlear canal abneurally to a secondary bony lamina before the appearance of an opposing primary bony lamina or tractus foraminosus. Additionally, while corroborating the general trend of reduction of venous sinuses and plexuses within the pars cochlearis seen in crownward mammaliaforms generally, the Höövör petrosals show the localized enlargement of a portion of the intrapetrosal venous plexus. This new vascular feature is here interpreted as the bony accommodation for the vein of cochlear aqueduct, a structure that is solely, or predominantly, responsible for the venous drainage of the cochlear apparatus in extant therians. Given that our fossil stem therian inner ear specimens appear to have very limited high-frequency capabilities, the development of these modern vascular features of the cochlear endocast suggest that neither the initiation or enlargement of the stria vascularis (a unique mammalian organ) was originally associated with the capacity for high-frequency hearing or precise sound-source localization. 3 3
Display all details of Alec Wilken Many vertebrates exhibit cranial kinesis, or movement between bones of the skull other than at the jaw joint. Many kinetic species possess a particular suite of features to accomplish this movement, including flexible cranial joints and protractor musculature. Whereas the skeletal anatomy of these kinetic systems is well understood, how these joints are biomechanically loaded, how different soft tissues affect joint loading and kinetic capacity, and how the protractor musculature loads the skull remain poorly understood. Here we developed a Finite Element Model of the savannah monitor, Varanus exanthematicus, a modestly kinetic lizard, to better elucidate the roles of soft tissue in mobile joints and protractor musculature on cranial loading. We described the 3D resultants of jaw muscles and histology of palatobasal, otic and jaw joints. We tested the effects of joint tissue types, bite point, and muscle loads to evaluate the biomechanical role of muscles have on the palate and braincase. We found the jaw muscles have significant mediolateral components and resultants that can impart stability across palatocranial joints. We found articular tissues affect the magnitude of strains experienced across the palatobasal and otic joints. We found that without protractor muscle loading, the palate, quadrate and braincase experience higher strains suggesting this muscle helps insulate the braincase and palatoquadrate from high loads. Finally, we found the cross-sectional properties of the bones of Varanus exanthematicus is well suited for performing under torsional loads. These findings suggest that torsion may be a significant driver in the evolution of cranial kinesis in lepidosaurs. 0 0
Display all details of A new leptoceratopsid dinosaur from Maastrichtian-aged deposits of the Sustut Basin, northern British Columbia, Canada A partial dinosaur skeleton from the Sustut Basin of northern British Columbia, Canada, previously described as an indeterminate neornithischian, is here reinterpreted as a leptoceratopsid ceratopsian, Ferrisaurus sustutensis, gen. et. sp. nov. The skeleton includes parts of the pectoral girdles, left forelimb, left hindlimb, and right pes. It can be distinguished from other named leptoceratopsids based on the proportions of the ulna and pedal phalanges. This is the first unique dinosaur species reported from British Columbia, and can be placed within a reasonably resolved phylogenetic context, with Ferrisaurus recovered as more closely related to Leptoceratops than Montanoceratops. At 68.2 to 67.2 Ma in age, Ferrisaurus falls between, and slightly overlaps with, both Montanoceratops and Leptoceratops, and represents a western range extension for Laramidian leptoceratopsids. 16 1
Display all details of Reflectance Transformation Imaging of Gordoniconus, an early coleoid cephalopod Gordoniconus beargulchensis is currently the oldest coleoid that is preserved with soft tissues such as the arms, gills, digestive tract and the cephalic cartilage. It was discovered at Bear Gulch, Montana, and is of Mississippian age. Although flattened, the soft tissues and the hard parts are still slightly elevated. In order to visualize these structures, we chose Reflectance Transformation Imaging (RTI), which allows the viewer to change the direction and angle of light. 0 0
Display all details of USNM 450071 4 1
Display all details of Cranial shape divergence of Dasyurus hallucatus 101 101
Display all details of Knee function through Finite Element Analysis and the role of Miocene hominoids to understand the origin of antipronograde behaviours: the Pierolapithecus catalaunicus’ patella as a test-case study This project was created in relation to the article "Knee function through finite element analysis and the role of Miocene hominoids in our understanding of the origin of antipronograde behaviours: the Pierolapithecus catalaunicus patella as a case study" Pina et al. 2020 published in the Journal of Palaeontology: https://doi.org/10.1111/pala.12466 Other supporting data available through https://datadryad.org/stash: https://doi.org/10.5061/dryad.453dg14 24 12
Display all details of Paleocene fruits and seeds from Newell's Nook, Montana The Newell's Nook locality of Montana is one of the few fruit and seed assemblages described from the Paleocene of North America. Likely early Tiffanian in age, this site is known for its rich vertebrate fossil record, which co-occur with the paleobotanical material presented here. The site includes members of modern day families, including Sabiaceae, Menispermaceae, Juglandaceae, and Vitaceae, alongside other unique taxa with uncertain affinities. Study of localities like Newell's Nook will help us create a more complete picture of Paleocene life. 16 8
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