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The Mussentuchit local fauna, Utah, USA, is among the best-known terrestrial vertebrate assemblages from the Cretaceous. Study samples include teeth from six microvertebrate sites, ranging in depositional setting from distal floodplain to channel lags. We recognize four theropod morphotypes: a comparatively large theropod (morph 1), a medium-sized dromaeosaurid (morph 2), a small dromaeosaurid (morph 3), and a tooth-morph similar to the genus <jats:italic>Richardoestesia<\/jats:italic> (morph 4). These four morphotypes vary significantly in mean size, from 15.1\u2009mm in the largest theropod to 3.7\u2009mm in <jats:italic>Richardoestesia<\/jats:italic>. Further, tooth representation from two of the best-sampled microsites (representing a channel\/splay and floodplain deposit) show differing patterns of abundances with morphs 1 and 3 having roughly the same abundance in both sites, while morph 2 was more abundant in the floodplain setting and morph 4 was more abundant in the channel\/splay. Stable isotope analysis (\u03b4<jats:sup>13<\/jats:sup>C; \u03b4<jats:sup>18<\/jats:sup>O) of tooth carbonate from the theropod morphotypes, goniopholidid crocodilians, and matrix (to test for diagenesis) from these sites were also analyzed. The theropods show modest differences in \u03b4<jats:sup>13<\/jats:sup>C values between each other, with carbonate from the teeth of morphs 1, 3, and 4 being enriched in <jats:sup>13<\/jats:sup>C for the channel\/splay relative to the floodplain environments, possibly indicative of dietary plasticity in these species. We hypothesize that these data indicate that the Mussentuchit theropods had different niches within the predator guild, suggesting plausible means by which ecospace was divided among the predatory dinosaurs of the Mussentuchit local fauna.<\/jats:p>","DOI":"10.1038\/s41598-018-35689-6","type":"journal-article","created":{"date-parts":[[2018,12,10]],"date-time":"2018-12-10T16:39:58Z","timestamp":1544459998000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":30,"title":["Niche Partitioning in Theropod Dinosaurs: Diet and Habitat Preference in Predators from the Uppermost Cedar Mountain Formation (Utah, U.S.A.)"],"prefix":"10.1038","volume":"8","author":[{"given":"J. A.","family":"Frederickson","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"M. H.","family":"Engel","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"R. 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