@article{vance‐chalcraft_gates_hurlbert_2024, title={Bringing Global Ecological Research to Undergraduate Students Through Citizen Science}, url={https://doi.org/10.1002/bes2.2169}, DOI={10.1002/bes2.2169}, abstractNote={Abstract Research integrated into higher education curricula has been shown by numerous studies to be beneficial to undergraduate students. Citizen science provides an alternative to research performed in a lab and is gaining traction as a good choice for integration into classes. The Undergraduate Student Experiences in Citizen Science (USE Cit Sci) research collaboration network is working to help more instructors in higher education adopt citizen science as part of their curriculum by providing training and educational materials. To date, the Network has identified areas of critical need for citizen science to be more readily used in higher education courses and created a clearinghouse of lessons for faculty to use freely. Forthcoming products of the USE Cit Sci network include direct partnerships between educators and citizen science projects in addition to a peer mentoring program. Given the preponderance of ecology citizen science projects available, bringing this educational opportunity to students opens new avenues of pedagogical experiences.}, journal={The Bulletin of the Ecological Society of America}, author={Vance‐Chalcraft, Heather D. and Gates, Terry A. and Hurlbert, Allen H.}, year={2024}, month={Jul} } @article{zanno_gates_avrahami_tucker_makovicky_2023, title={An early-diverging iguanodontian (Dinosauria: Rhabdodontomorpha) from the Late Cretaceous of North America}, volume={18}, ISSN={["1932-6203"]}, url={https://doi.org/10.1371/journal.pone.0286042}, DOI={10.1371/journal.pone.0286042}, abstractNote={Intensifying macrovertebrate reconnaissance together with refined age-dating of mid-Cretaceous assemblages in recent decades is producing a more nuanced understanding of the impact of the Cretaceous Thermal Maximum on terrestrial ecosystems. Here we report discovery of a new early-diverging ornithopod, Iani smithi gen. et sp. nov., from the Cenomanian-age lower Mussentuchit Member, Cedar Mountain Formation of Utah, USA. The single known specimen of this species (NCSM 29373) includes a well-preserved, disarticulated skull, partial axial column, and portions of the appendicular skeleton. Apomorphic traits are concentrated on the frontal, squamosal, braincase, and premaxilla, including the presence of three premaxillary teeth. Phylogenetic analyses using parsimony and Bayesian inference posit Iani as a North American rhabdodontomorph based on the presence of enlarged, spatulate teeth bearing up to 12 secondary ridges, maxillary teeth lacking a primary ridge, a laterally depressed maxillary process of the jugal, and a posttemporal foramen restricted to the squamosal, among other features. Prior to this discovery, neornithischian paleobiodiversity in the Mussentuchit Member was based primarily on isolated teeth, with only the hadrosauroid Eolambia caroljonesa named from macrovertebrate remains. Documentation of a possible rhabdodontomorph in this assemblage, along with published reports of an as-of-yet undescribed thescelosaurid, and fragmentary remains of ankylosaurians and ceratopsians confirms a minimum of five, cohabiting neornithischian clades in earliest Late Cretaceous terrestrial ecosystems of North America. Due to poor preservation and exploration of Turonian–Santonian assemblages, the timing of rhabdodontomorph extirpation in the Western Interior Basin is, as of yet, unclear. However, Iani documents survival of all three major clades of Early Cretaceous neornithischians (Thescelosauridae, Rhabdodontomorpha, and Ankylopollexia) into the dawn of the Late Cretaceous of North America.}, number={6}, journal={PLOS ONE}, author={Zanno, Lindsay E. and Gates, Terry A. and Avrahami, Haviv M. and Tucker, Ryan T. and Makovicky, Peter J.}, editor={Liu, JunEditor}, year={2023}, month={Jun} } @article{paciulli_jevnikar_kwon_gates_2023, title={When Life Gives You Lemons, Do Outreach! A Program for University Professors to Virtually Connect to K-12 Students during the COVID-19 Pandemic and beyond}, url={https://doi.org/10.46767/kfp.2016-0050}, DOI={10.46767/kfp.2016-0050}, abstractNote={At the beginning of the coronavirus pandemic in the Spring of 2020, North Carolina (NC) public schools moved to distance education in which all students attended classes on video conferencing programs. During this time, NC State University faculty offered virtual guest talks to NC K-12 students. Eighty-eight faculty from three NC State colleges volunteered and 161 teachers requested talks, with approximately 5,400 students. Overall, significantly more teachers from the NC Piedmont region requested speakers (p<.0001); significantly more urban teachers requested talks (p<.0001); and, significantly more elementary school teachers requested speakers than middle (p<.0001) or high school (p<.0001) teachers. The program was beneficial to teachers and students, exposing them to real-world research. In the future, the program should be}, journal={Journal of Interdisciplinary Teacher Leadership}, author={Paciulli, Lisa M. and Jevnikar, McKenzie N. and Kwon, Taeim and Gates, Terry A.}, year={2023}, month={Dec} } @article{tucker_hyland_gates_king_roberts_foley_berndt_hanta_khansubha_aswasereelert_et al._2022, title={Age, depositional history, and paleoclimatic setting of Early Cretaceous dinosaur assemblages from the Sao Khua Formation (Khorat Group), Thailand}, volume={601}, ISSN={["1872-616X"]}, DOI={10.1016/j.palaeo.2022.111107}, abstractNote={We describe the sedimentology, geochronology, and geochemistry of the Early Cretaceus Sao Khua Formation of the Khorat Basin, northeastern Thailand, and report a temporal range adjustment for its dinosaurian assemblage. Facies analysis and architectural studies reveal that sedimentation occurred within a floodplain setting fed by large meandering bedload-rich channels. Interfluve areas comprised freshwater lakes and emergent areas subject to pedogenic modification. Multiple paleosol types are identified and geochemistry is indicative of a stable humid subtropical climate regime. Based on radiometric dating of detrital zircons (via LA-ICP-MS), we interpret that the middle part of the Sao Khua Formation was deposited no later than 133.8 (±1.8) Ma (late Valanginian), and grain ages collected from the overlying lowermost Phu Phan Fm constrain sedimentation of the upper part of the Sao Khua Formation to no earlier than 132.4 (±2.0) Ma (early Hauterivian). In consideration of the Early Cretaceous regional tectonic framework, we interpret that youthful igneous zircon grains are derived from the adjacent South China-Vietnam South Borneo Volcanic Arc. We establish that the entombed dinosaur biota (including members of the Ornithomimosauria, Spinosauridae, Megaraptora, and Somphospondylia) is ~5–9 million years older than previously recognized and that these records are among the oldest known globally for these clades. Constraining the age of the Sao Khua Formation indicates that the shift from sauropod-dominated, ornithischian depauperate ecosystems of the Sao Khua Formation to iguanodontian-rich ecosystems of the Khok Kruat Formation occurred sometime between the early Hauterivian and Aptian on the Khorat Plateau.}, journal={PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY}, author={Tucker, Ryan T. and Hyland, Ethan G. and Gates, Terry A. and King, M. Ryan and Roberts, Eric M. and Foley, Elliot K. and Berndt, David and Hanta, Rattanaphorn and Khansubha, Sasa-on and Aswasereelert, Wasinee and et al.}, year={2022}, month={Sep} } @article{gates_cai_hu_han_griffith_burgener_hyland_zanno_2022, title={Estimating ancient biogeographic patterns with statistical model discrimination}, volume={9}, ISSN={["1932-8494"]}, url={https://doi.org/10.1002/ar.25067}, DOI={10.1002/ar.25067}, abstractNote={AbstractThe geographic ranges in which species live is a function of many factors underlying ecological and evolutionary contingencies. Observing the geographic range of an individual species provides valuable information about these historical contingencies for a lineage, determining the distribution of many distantly related species in tandem provides information about large‐scale constraints on evolutionary and ecological processes generally. We present a linear regression method that allows for the discrimination of various hypothetical biogeographical models for determining which landscape distributional pattern best matches data from the fossil record. The linear regression models used in the discrimination rely on geodesic distances between sampling sites (typically geologic formations) as the independent variable and three possible dependent variables: Dice/Sorensen similarity; Euclidean distance; and phylogenetic community dissimilarity. Both the similarity and distance measures are useful for full‐community analyses without evolutionary information, whereas the phylogenetic community dissimilarity requires phylogenetic data. Importantly, the discrimination method uses linear regression residual error to provide relative measures of support for each biogeographical model tested, not absolute answers orp‐values. When applied to a recently published dataset of Campanian pollen, we find evidence that supports two plant communities separated by a transitional zone of unknown size. A similar case study of ceratopsid dinosaurs using phylogenetic community dissimilarity provided no evidence of a biogeographical pattern, but this case study suffers from a lack of data to accurately discriminate and/or too much temporal mixing. Future research aiming to reconstruct the distribution of organisms across a landscape has a statistical‐based method for determining what biogeographic distributional model best matches the available data.}, journal={ANATOMICAL RECORD-ADVANCES IN INTEGRATIVE ANATOMY AND EVOLUTIONARY BIOLOGY}, author={Gates, Terry A. and Cai, Hengrui and Hu, Yifei and Han, Xu and Griffith, Emily and Burgener, Landon and Hyland, Ethan and Zanno, Lindsay E.}, year={2022}, month={Sep} } @article{mcdonald_wolfe_fowler_gates_2021, title={A new brachylophosaurin (Dinosauria: Hadrosauridae) from the Upper Cretaceous Menefee Formation of New Mexico}, volume={9}, ISSN={["2167-8359"]}, DOI={10.7717/peerj.11084}, abstractNote={Brachylophosaurini is a clade of hadrosaurid dinosaurs from the Campanian of western North America. Although well-known from northern localities in Montana and Alberta, including abundant material of Brachylophosaurus canadensis and Maiasaura peeblesorum and the holotypes of Acristavus gagslarsoni and Probrachylophosaurus bergei, material from southern localities in Utah and Colorado is restricted to a partial skull referred to A. gagslarsoni and several indeterminate specimens. Here we describe Ornatops incantatus gen. et sp. nov., a new brachylophosaurin known from a partial skeleton from the Allison Member of the Menefee Formation in New Mexico. Ornatops is the first brachylophosaurin reported from New Mexico and the southernmost occurrence of the clade. Ornatops shares with Probrachylophosaurus and Brachylophosaurus a caudally expanded nasofrontal suture on the frontals, but also exhibits an autapomorphic nasofrontal suture morphology, with a horizontal rostral region and elevated caudal region with two prominent parasagittal bumps, which is different from other brachylophosaurin specimens, including juvenile and adult Brachylophosaurus. A phylogenetic analysis places Ornatops in a trichotomy with Probrachylophosaurus and Brachylophosaurus, with Maiasaura and Acristavus as successive outgroups.}, journal={PEERJ}, author={McDonald, Andrew T. and Wolfe, Douglas G. and Fowler, Elizabeth A. Freedman and Gates, Terry A.}, year={2021}, month={Apr} } @article{gates_lamb_2021, title={A redescription of Lophorhothon atopus (Ornithopoda: Dinosauria) fromthe Late Cretaceous of Alabama based on new material}, volume={58}, ISSN={["1480-3313"]}, DOI={10.1139/cjes-2020-0173}, abstractNote={ Diagnostic dinosaur fossils of the southeastern United States are rare discoveries, and even more precious are those fossils that preserve a large portion of a skeleton. Sixty years ago, the dinosaur Lophorhothon atopus was described from Upper Cretaceous sediments of Alabama. It then represented the oldest, most complete, dinosaur in the southeastern United States. Based on a reexamination of the holotype material and a new specimen collected from the same beds, we provide a new diagnosis of this taxon. In particular, the solid nasal crest has several autapomorphies including caudally projecting frontal processes that are oval in cross section, meaning that they did not coalesce at the midline. Other autapomorphies are found on the prefrontal and squamosal. Combining the two Lophorhothon specimens provides nearly the entire skeleton for phylogenetic analysis, which we find as a hadrosauromorph just outside of Hadrosauridae. The original diagnosis of this taxon included the frontonasal fontanelle as a distinguishing character, but comparing the many examples of frontonasal openings across hadrosauromorph taxa shows that in at least a few species, such as Lophorhothon, the structures should be considered a frontonasal fenestra instead of a fontanelle. Additionally, the notion that dinosaurs from the East Coast of the United States represent primitive relicts is an idea that originated before many of the European and Asian hadrosauromorphs known today had been discovered. With new dating and phylogenetic information, it appears that Appalachian dinosaurs are on par evolutionarily with most of the global community and the term ”relict fauna” should be abandoned. }, number={9}, journal={CANADIAN JOURNAL OF EARTH SCIENCES}, author={Gates, Terry A. and Lamb, James P.}, year={2021}, month={Sep}, pages={918–935} } @article{burgener_hyland_griffith_mitasova_zanno_gates_2021, title={An extreme climate gradient-induced ecological regionalization in the Upper Cretaceous Western Interior Basin of North America}, volume={133}, ISSN={["1943-2674"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85111073513&partnerID=MN8TOARS}, DOI={10.1130/B35904.1}, abstractNote={Abstract The Upper Cretaceous Western Interior Basin of North America provides a unique laboratory for constraining the effects of spatial climate patterns on the macroevolution and spatiotemporal distribution of biological communities across geologic timescales. Previous studies suggested that Western Interior Basin terrestrial ecosystems were divided into distinct southern and northern communities, and that this provincialism was maintained by a putative climate barrier at ∼50°N paleolatitude; however, this climate barrier hypothesis has yet to be tested. We present mean annual temperature (MAT) spatial interpolations for the Western Interior Basin that confirm the presence of a distinct terrestrial climate barrier in the form of a MAT transition zone between 48°N and 58°N paleolatitude during the final 15 m.y. of the Cretaceous. This transition zone was characterized by steep latitudinal temperature gradients and divided the Western Interior Basin into warm southern and cool northern biomes. Similarity analyses of new compilations of fossil pollen and leaf records from the Western Interior Basin suggest that the biogeographical distribution of primary producers in the Western Interior Basin was heavily influenced by the presence of this temperature transition zone, which in turn may have impacted the distribution of the entire trophic system across western North America.}, number={9-10}, journal={GEOLOGICAL SOCIETY OF AMERICA BULLETIN}, author={Burgener, Landon and Hyland, Ethan and Griffith, Emily and Mitasova, Helena and Zanno, Lindsay E. and Gates, Terry A.}, year={2021}, pages={2125–2136} } @article{vance-chalcraft_hurlbert_styrsky_gates_bowser_hitchcock_reyes_cooper_2022, title={Citizen Science in Postsecondary Education: Current Practices and Knowledge Gaps}, volume={72}, ISSN={["1525-3244"]}, url={https://doi.org/10.1093/biosci/biab125}, DOI={10.1093/biosci/biab125}, abstractNote={Abstract Citizen science involves the public in science to investigate research questions. Although citizen science facilitates learning in informal educational settings, little is known about its use or effects in postsecondary (college or university) settings. Using a literature review and a survey, we describe how and why citizen science is being used in postsecondary courses, as well as the impacts on student learning. We found that citizen science is used predominantly in biologically related fields, at diverse types of institutions, to improve student engagement and expose students to authentic research. Considerable anecdotal evidence supporting improved student learning from these experiences exists, but little empirical evidence exists to warrant any conclusion. Therefore, there is a need to rigorously assess the relationship between citizen science participation and postsecondary student learning. We highlight considerations for instructors planning to incorporate citizen science and for citizen science projects wanting to facilitate postsecondary use.}, number={3}, journal={BIOSCIENCE}, publisher={Oxford University Press (OUP)}, author={Vance-Chalcraft, Heather D. and Hurlbert, Allen H. and Styrsky, Jennifer Nesbitt and Gates, Terry A. and Bowser, Gillian and Hitchcock, Colleen B. and Reyes, Michelle Anne and Cooper, Caren B.}, year={2022}, month={Mar}, pages={276–288} } @article{gates_evans_sertich_2021, title={Description and rediagnosis of the crested hadrosaurid (Ornithopoda) dinosaur Parasaurolophus cyrtocristatus on the basis of new cranial remains}, volume={9}, ISSN={["2167-8359"]}, DOI={10.7717/peerj.10669}, abstractNote={For nearly 60 years, skulls ofParasaurolophusspecies have been differentiated primarily on the basis of crest shape rather than on unique morphologic characters of other cranial elements. Complicating matters is the fact that crests dramatically change shape throughout ontogeny. Without a complete growth series, it has become difficult to assess the taxonomic distinctness of each species through the lens of allometric growth.Parasaurolophus cyrtocristatushas proven to be especially troublesome to assess because of the poorly preserved nature of the type and only skull. A new, partial skull from the Fossil Forest Member of the Fruitland Formation—the same geologic unit as the type specimen—is the first opportunity to re-diagnose this species as well as redefine the genus with many new traits. An undescribed, short-crested subadult skull from the Kaiparowits Formation of Utah previously assigned to cf.P. cyrtocristatusallows detailed comparisons to be made between the unnamed Utah taxon and the material of this species from the type locality. We find that several characteristics of the squamosal, supraoccipital, and premaxilla shared between the referred skull and the type skull are unique toP. cyrtocristatus(senso stricto) within the genus, irrespective of the overall crest shape. A phylogenetic analysis that includes six new characters posits thatP. cyrtocristatusandP. tubicenare sister taxa, and that the latter does not share a closest common ancestor with the long-crestedP. walkerias previously hypothesized. This result helps to explain why both taxa are found in northeastern New Mexico, USA and in sequential geologic units (Fruitland Formation and Kirtland Formation, respectively). Additionally, the exquisitely preserved new skull provides the first opportunity to unequivocally identify the osteological make-up of theParasaurolophuscranial crest. Unlike in previous reconstructions, the crest composition inParasaurolophusfollows what is seen in other lambeosaurines such asCorythosaurus, where the dorsal process of the premaxilla dominates the crest, with the nasal forming 80% of the ventral paired tubes, and the lateral premaxillary process acting a lateral cover between the dorsal and ventral tubes. The skull ofP. cyrtocristatusis still incompletely known, so more complete material will likely reveal new features that further differentiate this species and aid in determining the pace of ornamental crest evolution.}, journal={PEERJ}, author={Gates, Terry A. and Evans, David C. and Sertich, Joseph J. W.}, year={2021}, month={Jan} } @article{king_la croix_gates_anderson_zanno_2021, title={Glossifungites gingrasi n. isp., a probable subaqueous insect domicile from the Cretaceous Ferron Sandstone, Utah}, volume={95}, ISSN={["1937-2337"]}, DOI={10.1017/jpa.2020.115}, abstractNote={AbstractA new ichnospecies, Glossifungites gingrasi n. isp., is described from multiple locations in basal sand-filled coastal plain distributary channels of the Turonian (Upper Cretaceous) Ferron Sandstone (central Utah). Glossifungites gingrasi n. isp. is attributed to the ichnogenus Glossifungites based on the presence of scratch imprints, passive fill, and a tongue-shaped structure, yet the new ichnospecies is distinct because it displays transverse bioglyphs that run perpendicular to the planiform structure, which contrasts to the axis parallel bioglyphs present in the ichnospecies G. saxicava. The transverse arrangement of ornamentation exhibited by G. gingrasi n. isp. is observed in modern subaqueous insect burrows produced by mayfly and chironomid larvae, and constitutes a way to differentiate insect-generated burrows from structures produced by crustaceans that are known to create other Glossifungites ichnospecies. Differentiating insect- from crustacean-generated burrows is significant because it provides a way to distinguish bioturbation by marine-recruited fauna from that produced by freshwater fauna in the rock record, making G. gingrasi n. isp. a valuable ichnological tool for paleoenvironmental and stratigraphic interpretation. While G. gingrasi n. isp. may represent a burrow created by a variety of filter-feeding subaqueous insects, the large size of G. gingrasi n. isp. in the Ferron Sandstone suggests that the largest specimens are probable mayfly burrows and supports the assertion that burrowing mayflies (e.g., Polymitarcyidae and Ephemeridae) adapted to domicile filter-feeding during or prior to the Turonian.UUID: http://zoobank.org/a033b22f-bf09-481a-975e-3a1b096154cc}, number={3}, journal={JOURNAL OF PALEONTOLOGY}, author={King, M. Ryan and La Croix, Andrew D. and Gates, Terry A. and Anderson, Paul B. and Zanno, Lindsay E.}, year={2021}, month={May}, pages={427–439} } @article{zanno_tucker_canoville_avrahami_gates_makovicky_2019, title={Diminutive fleet-footed tyrannosauroid narrows the 70-million-year gap in the North American fossil record}, volume={2}, ISSN={["2399-3642"]}, url={https://doi.org/10.1038/s42003-019-0308-7}, DOI={10.1038/s42003-019-0308-7}, abstractNote={AbstractTo date, eco-evolutionary dynamics in the ascent of tyrannosauroids to top predator roles have been obscured by a 70-million-year gap in the North American (NA) record. Here we report discovery of the oldest Cretaceous NA tyrannosauroid, extending the lineage by ~15 million years. The new taxon—Moros intrepidus gen. et sp. nov.—is represented by a hind limb from an individual nearing skeletal maturity at 6–7 years. With a ~1.2-m limb length and 78-kg mass, M. intrepidus ranks among the smallest Cretaceous tyrannosauroids, restricting the window for rapid mass increases preceding the appearance of colossal eutyrannosaurs. Phylogenetic affinity with Asian taxa supports transcontinental interchange as the means by which iconic biotas of the terminal Cretaceous were established in NA. The unexpectedly diminutive and highly cursorial bauplan of NA’s earliest Cretaceous tyrannosauroids reveals an evolutionary strategy reliant on speed and small size during their prolonged stint as marginal predators.}, number={1}, journal={COMMUNICATIONS BIOLOGY}, publisher={Springer Nature}, author={Zanno, Lindsay E. and Tucker, Ryan T. and Canoville, Aurore and Avrahami, Haviv M. and Gates, Terry A. and Makovicky, Peter J.}, year={2019}, month={Feb} } @article{gates_gorscak_makovicky_2019, title={New sharks and other chondrichthyans from the latest Maastrichtian (Late Cretaceous) of North America}, volume={93}, ISSN={["1937-2337"]}, DOI={10.1017/jpa.2018.92}, abstractNote={AbstractCretaceous aquatic ecosystems were amazingly diverse, containing most clades of extant aquatic vertebrates as well as an array of sharks and rays not present today. Here we report on the chondrichthyan fauna from the late Maastrichtian site that yielded the Tyrannosaurus rex skeleton FMNH PF 2081 (“SUE”). Significant among the recovered fauna is an unidentified species of carcharhinid shark that adds to the fossil record of this family in the Cretaceous, aligning with estimates from molecular evidence of clade originations. Additionally, a new orectolobiform shark, here named Galagadon nordquistae n. gen. n. sp., is diagnosed on the basis on several autapomorphies from over two-dozen teeth. Common chondrichthyan species found at the “SUE” locality include Lonchidion selachos and Myledaphus pustulosus. Two phylogenetic analyses (Maximum Parsimony and Bayesian Inference) based on twelve original dental character traits combined with 136 morphological traits from a prior study of 28 fossil and extant taxa, posited Galagadon n. gen. in two distinct positions: as part of a clade inclusive of the fossil species Cretorectolobus olsoni and Cederstroemia triangulata plus extant orectolobids from the Maximum Parsimony analysis; and as the sister taxon to all extant hemiscyllids from the Bayesian Inference. Model-based biogeographical reconstructions based on both optimal trees suggest rapid island hopping-style dispersal from the Western Pacific to the Western Interior Seaway of North America where Galagadon n. gen. lived. Alternatively, the next preferred model posits a broader, near-global distribution of Orectolobiformes with Galagadon n. gen. dispersing into its geographic position from this large ancestral range.UUID: http://zoobank.org/61e32ffc-4f87-4ff7-820d-0bb33a80f0a0}, number={3}, journal={JOURNAL OF PALEONTOLOGY}, author={Gates, Terry A. and Gorscak, Eric and Makovicky, Peter J.}, year={2019}, month={May}, pages={501–530} } @article{avrahami_gates_heckert_makovicky_zanno_2018, title={A new microvertebrate assemblage from the Mussentuchit Member, Cedar Mountain Formation: insights into the paleobiodiversity and paleobiogeography of early Late Cretaceous ecosystems in western North America}, volume={6}, ISSN={2167-8359}, url={http://dx.doi.org/10.7717/peerj.5883}, DOI={10.7717/peerj.5883}, abstractNote={The vertebrate fauna of the Late Cretaceous Mussentuchit Member of the Cedar Mountain Formation has been studied for nearly three decades, yet the fossil-rich unit continues to produce new information about life in western North America approximately 97 million years ago. Here we report on the composition of the Cliffs of Insanity (COI) microvertebrate locality, a newly sampled site containing perhaps one of the densest concentrations of microvertebrate fossils yet discovered in the Mussentuchit Member. The COI locality preserves osteichthyan, lissamphibian, testudinatan, mesoeucrocodylian, dinosaurian, metatherian, and trace fossil remains and is among the most taxonomically rich microvertebrate localities in the Mussentuchit Member. To better refine taxonomic identifications of isolated theropod dinosaur teeth, we used quantitative analyses of taxonomically comprehensive databases of theropod tooth measurements, adding new data on theropod tooth morphodiversity in this poorly understood interval. We further provide the first descriptions of tyrannosauroid premaxillary teeth and document the earliest North American record of adocid remains, extending the appearance of this ancestrally Asian clade by 5 million years in western North America and supporting studies of pre-Cenomaninan Laurasian faunal exchange across Beringia. The overabundance of mesoeucrocodylian remains at the COI locality produces a comparatively low measure of relative biodiversity when compared to other microvertebrate sites in the Mussentuchit Member using both raw and subsampling methods. Much more microvertebrate research is necessary to understand the roles of changing ecology and taphonomy that may be linked to transgression of the Western Interior Seaway or microhabitat variation.}, journal={PeerJ}, publisher={PeerJ}, author={Avrahami, Haviv M. and Gates, Terry A. and Heckert, Andrew B. and Makovicky, Peter J. and Zanno, Lindsay E.}, year={2018}, month={Nov}, pages={e5883} } @book{king_gates_gingras_zanno_pemberton_2018, title={Transgressive erosion expressed as a Rhizocorallium ​ -dominated xylic firmground: an example from the Blackhawk Formation, Utah}, volume={33}, ISSN={["1938-5323"]}, DOI={10.2110/palo.2016.111}, abstractNote={Abstract:  Horizontal and inclined U-shaped trace fossils are commonly associated with the Cruziana and Glossifungites ichnofacies, but have rarely been described as a component of the Teredolites ichnofacies (xylic substrates). This study provides several examples of morphologies of Glossifungites saxicava from the Campanian Sunnyside Coal (Blackhawk Formation) that exhibit both xenoglyphs and bioglyphs. Glossifungites along this surface are locally present as compound ?Thalassinoides suevicus-Glossifungites, which may represent a combination of commensalism, an exploited structural weakness, refugium from predators, and/or a secondary behavior of the presumed crustacean tracemakers. The trace-fossil assemblage also contains Teredolites clavatus and Teredolites longissimus and Radichnus isp. locally. Stratigraphically, this trace assemblage is important because it marks a marine flooding surface/transgressive surface of erosion between the Sunnyside and Grassy members of the Blackhawk Formation.}, number={1}, journal={PALAIOS}, publisher={PALAIOS}, author={King, M.R. and Gates, T.A. and Gingras, M.K. and Zanno, L.E. and Pemberton, G.}, year={2018}, pages={29–35} } @article{mcdonald_gates_zanno_makovicky_2017, title={Anatomy, taphonomy, and phylogenetic implications of a new specimen of Eolambia caroljonesa (Dinosauria: Ornithopoda) from the Cedar Mountain Formation, Utah, USA}, volume={12}, number={5}, journal={PLoS One}, author={McDonald, A. T. and Gates, T. A. and Zanno, L. E. and Makovicky, P. J.}, year={2017} } @article{arbour_zanno_gates_2016, title={Ankylosaurian dinosaur palaeoenvironmental associations were influenced by extirpation, sea-level fluctuation, and geodispersal}, volume={449}, ISSN={0031-0182}, url={http://dx.doi.org/10.1016/j.palaeo.2016.02.033}, DOI={10.1016/j.palaeo.2016.02.033}, abstractNote={More species of nodosaurid ankylosaurians than ankylosaurid ankylosaurians have been found in marine sediments, and some previous quantitative studies of global dinosaur occurrences provide support for an association between nodosaurids and marine depositional environments. We compiled a dataset of global ankylosaurian occurrences and found that the geographic distribution of marine ankylosaurian occurrences is regionally biased with 54% of records stemming from western North America in the Cretaceous—a time of regional highstands in sea level and epicontinental flooding, coupled with differential extirpation of ankylosaurian subclades inhabiting the Western Interior Basin (WIB). Within the Western Interior Basin, we found little statistical support for an association between ankylosaurian subclades and palaeoenvironment in a chronological context. Only the Albian–Cenomanian transgressive–regressive cycle had statistical support for an overabundance of nodosaurids in marine environments compared to ankylosaurids. The apparent overabundance of nodosaurids relative to ankylosaurids in marine sediments in the Western Interior Basin overall cannot be decoupled from the extirpation of North American ankylosaurids during the Cenomanian and the subsequent absence of ankylosaurids in North America during the Turonian to early Campanian prior to the immigration of Asian ankylosaurine ankylosaurids. The North American ankylosaurian record highlights the difficulty in interpreting habitat preferences in the context of a shifting seaway, regional extinctions, and intercontinental dispersals.}, journal={Palaeogeography, Palaeoclimatology, Palaeoecology}, publisher={Elsevier BV}, author={Arbour, Victoria M. and Zanno, Lindsay E. and Gates, Terry}, year={2016}, month={May}, pages={289–299} } @article{gates_organ_zanno_2016, title={Bony cranial ornamentation linked to rapid evolution of gigantic theropod dinosaurs}, volume={7}, journal={Nature Communications}, author={Gates, T. A. and Organ, C. and Zanno, L. E.}, year={2016} } @article{zanno_tsogtbaatar_chinzorig_gates_2016, title={Specializations of the mandibular anatomy and dentition of Segnosaurus galbinensis (Theropoda: Therizinosauria)}, volume={4}, journal={PeerJ}, author={Zanno, L. E. and Tsogtbaatar, K. and Chinzorig, T. and Gates, T. A.}, year={2016} } @article{gates_scheetz_2015, title={A new saurolophine hadrosaurid (Dinosauria: Ornithopoda) from the Campanian of Utah, North America}, volume={13}, ISSN={["1478-0941"]}, DOI={10.1080/14772019.2014.950614}, abstractNote={A new hadrosaurid is described from the Upper Cretaceous Neslen Formation of central Utah. Rhinorex condrupus gen. et sp. nov. is diagnosed on the basis of two unique traits, a hook-shaped projection of the nasal anteroventral process and dorsal projection of the posteroventral process of the premaxilla, and is further differentiated from other hadrosaurid species based on the morphology of the nasal (large nasal boss on the posterodorsal corner of the circumnarial fossa, small protuberences on the anterior process, absence of nasal arch), jugal (vertical postorbital process), postorbital (high degree of flexion present on posterior process), and squamosal (inclined anterolateral processes). This new taxon was discovered in estuarine sediments dated at approximately 75 Ma and just 250 km north of the prolific dinosaur-bearing strata of the Kaiparowits Formation, possibly overlapping in time with Gryposaurus monumentensis. Phylogenetic parsimony and Bayesian analyses associate this new taxon with the Gryposaurus clade, even though the type specimen does not possess the diagnostic nasal hump of the latter genus. Comparisons with phylogenetic analyses from other studies show that a current consensus exists between the general structure of the hadrosaurid evolutionary tree, but on closer examination there is little agreement among species relationships. http://zoobank.org/urn:lsid:zoobank.org:pub:0FDD0FE6-6C20-4838-BD4A-092161179095}, number={8}, journal={JOURNAL OF SYSTEMATIC PALAEONTOLOGY}, author={Gates, Terry A. and Scheetz, Rodney}, year={2015}, month={Aug}, pages={711–725} } @article{boyd_drumheller_gates_2013, title={Crocodyliform Feeding Traces on Juvenile Ornithischian Dinosaurs from the Upper Cretaceous (Campanian) Kaiparowits Formation, Utah}, volume={8}, ISSN={["1932-6203"]}, DOI={10.1371/journal.pone.0057605}, abstractNote={Crocodyliforms serve as important taphonomic agents, accumulating and modifying vertebrate remains. Previous discussions of Mesozoic crocodyliform feeding in terrestrial and riverine ecosystems have often focused on larger taxa and their interactions with equally large dinosaurian prey. However, recent evidence suggests that the impact of smaller crocodyliforms on their environments should not be discounted. Here we present direct evidence of feeding by a small crocodyliform on juvenile specimens of a ‘hypsilophodontid’ dinosaur from the Upper Cretaceous (Campanian) Kaiparowits Formation of southern Utah. Diagnostic crocodyliform bite marks present on a left scapula and a right femur, as well as a partial probable crocodyliform tooth crown (ovoid in cross-section) preserved within a puncture on the right femur, comprise the bulk of the feeding evidence. Computed tomography scans of the femoral puncture reveal impact damage to the surrounding bone and that the distal tip of the embedded tooth was missing prior to the biting event. This is only the second reported incidence of a fossil crocodyliform tooth being found embedded directly into prey bone. These bite marks provide insight into the trophic interactions of the ecosystem preserved in the Kaiparowits Formation. The high diversity of crocodyliforms within this formation may have led to accentuated niche partitioning, which seems to have included juvenile dinosaurian prey.}, number={2}, journal={PLOS ONE}, author={Boyd, Clint A. and Drumheller, Stephanie K. and Gates, Terry A.}, year={2013}, month={Feb} }