@article{boyd_cleland_marrero_clarke_2011, title={Exploring the effects of phylogenetic uncertainty and consensus trees on stratigraphic consistency scores: A new program and a standardized method}, volume={27}, number={1}, journal={Cladistics}, author={Boyd, C. A. and Cleland, T. P. and Marrero, N. L. and Clarke, J. A.}, year={2011}, pages={52–60} }
 @article{boyd_cleland_novas_2011, title={Osteogenesis, homology, and function of the intercostal plates in ornithischian dinosaurs (Tetrapoda, Sauropsida)}, volume={130}, number={4}, journal={Zoomorphology}, author={Boyd, C. A. and Cleland, T. P. and Novas, F.}, year={2011}, pages={305–313} }
 @article{boyd_brown_scheetz_clarke_2009, title={TAXONOMIC REVISON OF THE BASAL NEORNITHISCHIAN TAXA THESCELOSAURUS AND BUGENASAURA}, volume={29}, ISSN={["1937-2809"]}, DOI={10.1671/039.029.0328}, abstractNote={ABSTRACT Considerable controversy surrounds the taxonomy and phylogenetic relationships of Maastrichtian basal neornithischian taxa from North America. Discovery of previously unrecognized cranial material from the paratype specimen of Thescelosaurus neglectus (USNM 7758), along with the examination of two new specimens that preserve nearly complete skulls and mandibles, allows for reevaluation of specimens previously referred to Thescelosaurus that preserve cranial material, including the holotypes of Bugenasaura infernalis (SDSM 7210) and Parksosaurus warreni (ROM 804). A phylogenetic analysis was conducted that included as terminals the holotypes of B. infernalis and P. warreni, the type series of T. neglectus, and six specimens previously referred to Thescelosaurus. This analysis is the first to recover a clade containing all basal neornithischian taxa from the Cretaceous of North America, within which P. warreni is recovered as the sister taxon to a Thescelosaurus clade whose monophyly is supported by five cranial autapomorphies. The results of this analysis support: (1) the synonymization of Bugenasaura with Thescelosaurus; (2) the removal of ROM 804 from Thescelosaurus; and (3) the validity of Thescelosaurus garbanii and its referral to Thescelosaurus despite its fragmentary nature. Currently, Parksosaurus and Thescelosaurus are the only basal neornithischian taxa definitively known from Maastrichtian age sediments of North America, while other basal neornithischian taxa proposed to demonstrate fossorial behavior (i.e., Orodromeus, Oryctodromeus, and Zephyrosaurus) are known from Campanian and older sediments. This temporal segregation may support previous hypotheses of an environmental or ecological shift during the latest Cretaceous in North America.}, number={3}, journal={JOURNAL OF VERTEBRATE PALEONTOLOGY}, author={Boyd, Clint A. and Brown, Caleb Marshall and Scheetz, Rodney D. and Clarke, Julia A.}, year={2009}, month={Sep}, pages={758–770} }
 @article{clarke_ksepka_stucchie_urbina_giannini_bertelli_narvez_boyd_2007, title={Paleogene equatorial penguins challenge the proposed relationship between biogeography, diversity, and Cenozoic climate change}, volume={104}, ISSN={["0027-8424"]}, DOI={10.1073/pnas.0611099104}, abstractNote={
            New penguin fossils from the Eocene of Peru force a reevaluation of previous hypotheses regarding the causal role of climate change in penguin evolution. Repeatedly it has been proposed that penguins originated in high southern latitudes and arrived at equatorial regions relatively recently (e.g., 4–8 million years ago), well after the onset of latest Eocene/Oligocene global cooling and increases in polar ice volume. By contrast, new discoveries from the middle and late Eocene of Peru reveal that penguins invaded low latitudes >30 million years earlier than prior data suggested, during one of the warmest intervals of the Cenozoic. A diverse fauna includes two new species, here reported from two of the best exemplars of Paleogene penguins yet recovered. The most comprehensive phylogenetic analysis of Sphenisciformes to date, combining morphological and molecular data, places the new species outside the extant penguin radiation (crown clade: Spheniscidae) and supports two separate dispersals to equatorial (paleolatitude ≈14°S) regions during greenhouse earth conditions. One new species,
            Perudyptes devriesi
            , is among the deepest divergences within Sphenisciformes. The second,
            Icadyptes salasi
            , is the most complete giant (>1.5 m standing height) penguin yet described. Both species provide critical information on early penguin cranial osteology, trends in penguin body size, and the evolution of the penguin flipper.
          }, number={28}, journal={PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA}, author={Clarke, Julia A. and Ksepka, Daniel T. and Stucchie, Marcelo and Urbina, Mario and Giannini, Norberto and Bertelli, Sara and Narvez, Yanina and Boyd, Clint A.}, year={2007}, month={Jul}, pages={11545–11550} }