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|Display all details of Yoakum Dissertation MicroCT scans||327||168|
|Display all details of Triassic stem caecilian supports dissorophoid origin of living amphibians||Living amphibians (Lissamphibia) include frogs and salamanders (Batrachia), and the limbless worm-like caecilians (Gymnophiona). The estimated Paleozoic gymnophionan-batrachian molecular divergence suggests a major gap in the record of crown lissamphibians prior to their earliest fossil occurrences in the Triassic Period. Recent studies find a monophyletic Batrachia within dissorophoid temnospondyls, but the absence of pre-Jurassic caecilian fossils has made their relationships to batrachians and affinities to Paleozoic tetrapods controversial. Here we report the geologically-oldest stem caecilian, a crown lissamphibian, from the Late Triassic of Arizona, USA, extending the caecilian record by ~35 Ma. These fossils illuminate the tempo and mode of early caecilian morphological and functional evolution, demonstrating a delayed acquisition of musculoskeletal features associated with fossoriality in living caecilians, including the dual jaw closure mechanism, reduced orbits, and the tentacular organ. The provenance of these fossils suggests a Pangean equatorial origin for caecilians, implying that living caecilian biogeography reflects conserved aspects of caecilian function and physiology in combination with vicariance patterns driven by plate tectonics. These fossils reveal a combination of features unique to caecilians alongside features shared with batrachian and dissorophoid temnospondyls, providing new and compelling evidence supporting a single origin of living amphibians within dissorophoid temnospondyls.||Kligman, Ben||8||8|
|Display all details of Shark x-ray computed tomography||A database containing calibrated x-ray computed tomography scans of several species of sharks.||Lauridsen, Henrik||31||31|
|Display all details of Herpetology at University of Kansas||A series of CT scans of University of Kansas Natural History Museum herpetology specimens.||143||79|
|Display all details of Evidence for a novel cranial thermoregulatory pathway in thalattosuchian crocodylomorphs||Evidence for a novel cranial thermoregulatory pathway in thalattosuchian crocodylomorphs. PeerJ. Abstract: Thalattosuchian crocodylomorphs were a diverse clade that lived from the Early Jurassic to the Early Cretaceous. The subclade Metriorhynchoidea underwent a remarkable transition, evolving from semi-aquatic ambush predators into fully aquatic forms living in the open oceans. Thalattosuchians share a peculiar palatal morphology with semi-aquatic and aquatic fossil cetaceans: paired anteroposteriorly aligned grooves along the palatal surface of the bony secondary palate. In extant cetaceans, these grooves are continuous with the greater palatine artery foramina, arteries that supply their oral thermoregulatory structures. Herein, we investigate the origins of thalattosuchian palatal grooves by examining CT scans of six thalattosuchian species (one teleosauroid, two early-diverging metriorhynchoids and three metriorhynchids), and CT scans of eleven extant crocodylian species. All thalattosuchians had paired osseous canals, enclosed by the palatines, that connect the nasal cavity to the oral cavity. These osseous canals open into the oral cavity via foramina at the posterior terminus of the palatal grooves. Extant crocodylians lack both the external grooves and the internal canals. We posit that in thalattosuchians these novel palatal canals transmitted hypertrophied medial nasal vessels (artery and vein), creating a novel heat exchange pathway connecting the palatal vascular plexus to the endocranial region. Given the general hypertrophy of thalattosuchian cephalic vasculature, and their increased blood flow and volume, thalattosuchians would have required a more extensive suite of thermoregulatory pathways to maintain stable temperatures for their neurosensory tissues.||Mark Young||15||7|
|Display all details of Educational CAD Model Library - Mathematical Objects Collection||The Educational CAD Model Library is a curated repository for teaching and learning in K-12 schools. The Mathematical Objects Collection is a subset that addresses mathematics education.||Association of Mathematics Teacher Education (AMTE)||3||1|
|Display all details of The mode of life and feeding strategies of psammosteids (Vertebrata: Pteraspidomorphi) with insights from body-shape reconstructions of Middle Devonian Pycnosteus and Tartuosteus (Baltic Region)||To clarify the functional morphology and the feeding strategy of psammosteid heterostracans (Vertebrata: Pteraspidomorphi) were used their dermal plates from the Middle Devonian sandstones of the Baltic region, as they are three-dimension preserved and retain traces of lifetime abrasion on the bottom substrate. The method of the 3D reconstructions makes it possible to better understand the relative position and proportions of the plates, and, consequently, to refine the life form of animals significantly.||Dmitry Grigoriev||36||36|
|Display all details of Carnivoran dental morphology||data associated with "Bayesian prediction of multivariate ecology from phenotypic data yields new insights into the diets of extant and extinct taxa"||266||108|
|Display all details of Armored Fishes||Cassandra Donatelli||17||17|
|Display all details of Foramina and brain perfusion in mammals and birds||Repository of specimens used in the doctoral thesis of Thomas Jack Nelson.||Seymour, Roger||46||23|