The oldest centrosaurine: a new ceratopsid dinosaur (Dinosauria: Ceratopsidae) from the Allison Member of the Menefee Formation (Upper Cretaceous, early Campanian), northwestern New Mexico, USA

Osteology and reassessment of Dineobellator notohesperus, a southern eudromaeosaur (Theropoda: Dromaeosauridae: Eudromaeosauria) from the latest Cretaceous of New Mexico

“…Additional material, including new specimens of already known taxa, have been reported from the Late Cretaceous of New Mexico by numerous workers. These studies span the early Campanian through the end of the Cretaceous, and provide a clearer picture of this region leading up to (and after) the end‐Cretaceous mass extinction (e.g., Dalman et al, 2021; Dalman, Jasinski, & Lucas, 2022; Dalman & Lucas, 2018; Dalman, Lucas, et al, 2022; Gates, Evans, & Sertich, 2021; Kirkland & Wolfe, 2001; Lichtig & Lucas, 2016; Lucas, Spielmann, Sullivan, & Lewis, 2006; McDonald et al, 2006, 2010, 2018, 2021; Sullivan, Lucas, Jasinski, & Tanke, 2011; McDonald & Wolfe, 2018; Nesbitt et al, 2019; Sullivan & Lucas, 2015; Williamson, 1997; Wolfe & Kirkland, 1998). Fossils from the rocks of the Upper Cretaceous Fruitland Formation through Naashoibito Member (Ojo Alamo Formation) evince a world teeming with life during the time of the retreating Western Interior Seaway (Figure 1).…”

“…Additionally, some of this variation is particularly hard to definitively identify in the fossil record, especially sexual dimorphism (e.g., Mallon, 2017). Many studies have been conducted on morphological variation, particularly within fossil taxa (e.g., Arbour et al, 2016; Bell, 2011; Burns et al, 2015; Carter et al, 2021; Currie, 2003a, 2003b; Dalman et al, 2017, 2021; Dalman, Jasinski, & Lucas, 2022; Dalman, Lucas, et al, 2022; Delcourt & Iori, 2018; Dodson, 1976; Evans et al, 2013, 2014; Fabrezi et al, 2017; Gee & Jasinski, 2021; Grillo & Delcourt, 2017; Jasinski, 2011, 2013, 2015b, 2018; Jasinski et al, 2018, 2022; Jasinski & Moscato, 2014, 2017; Jasinski & Wallace, 2014, 2015; Ji et al, 2011; Johnson, 2020; Johnson et al, 2021; Lacovara et al, 2014; Lehman, 1987; 2001; Longrich, 2014; Lucas et al, 2011, 2016; Machado et al, 2013; Moscato & Jasinski, 2016; Osborn, 1923; Rivera‐Sylva et al, 2012; Rowe, Colbert, & Nations, 1981; Sampson et al, 2010; Sullivan et al, 2013; Sullivan & Jasinski, 2012; Sullivan, Jasinski, Guenther, & Lucas, 2011; Sullivan, Lucas, & Jasinski, 2011c, 2011d; Vamberger et al, 2020; Voris et al, 2019). While the only definitive specimen of Dineobellator notohesperus is the holotype (SMP VP‐2430), other specimens from the Naashoibito Member argue for the presence of more than one dromaeosaurid taxon in this stratigraphic unit.…”

“…As suggested by Jasinski et al (2020), there may still be some vicariance between biogeographical regions. There is a clear connection between many of the dinosaurs (e.g., ankylosaurids, hadrosaurids, pachycephalosaurids, ornithomimids, tyrannosaurids) of Asia and North America during the Late Cretaceous (e.g., Arbour et al, 2014;Brusatte and Carr, 2016;Dalman et al, 2017;Lucas et al, 2016;McFeeters et al, 2017;Prieto-M arquez, 2010;Sullivan, 1999 and how these came about, including possibilities for migration patterns, vicariance, and/or convergence, still need to be investigated.…”

“…Additionally, some of this variation is particularly hard to definitively identify in the fossil record, especially sexual dimorphism (e.g., Mallon, 2017). Many studies have been conducted on morphological variation, particularly within fossil taxa (e.g., Arbour et al, 2016;Bell, 2011;Burns et al, 2015;Carter et al, 2021;Currie, 2003aCurrie, , 2003bDalman et al, 2017Dalman et al, , 2021Delcourt & Iori, 2018;Dodson, 1976;Evans et al, 2013Evans et al, , 2014Fabrezi et al, 2017;Gee & Jasinski, 2021;Grillo & Delcourt, 2017;Jasinski, 2011Jasinski, , 2013Jasinski, , 2015bJasinski, , 2018Jasinski et al, 2018Jasinski et al, , 2022Jasinski & Moscato, 2014Jasinski & Wallace, 2014Ji et al, 2011;Johnson, 2020;Johnson et al, 2021;Lacovara et al, 2014;Lehman, 1987;2001;Longrich, 2014;Lucas et al, 2011Lucas et al, , 2016Machado et al, 2013;Moscato & Jasinski, 2016;Osborn, 1923;Rivera-Sylva et al, 2012;Rowe, Colbert, & Nations, 1981;Sampson et al, 2010;Sullivan et al, 2013;…”

14th Symposium on Mesozoic Terrestrial Ecosystems and Biota

“…Crittendenceratops from the Fort Crittenden Formation of Arizona can currently be constrained to a 10 million year interval, ranging from 86-76 Ma, and is represented by extremely fragmentary material that includes a unique squamosal that exhibits a dorsal otic ridge and a parietal frill with curled epiparietals (Dalman et al, 2018). Menefeeceratops from the Menefee Formation of New Mexico is from an interval dated between 83.5-80 Ma and is represented by a unique squamosal that exhibits a distinct dorsal otic ridge (Dalman et al, 2021). Yehuecauhceratops from the Aguja Formation of Coahuila Mexico is constrained to a wide interval of 80.0-76.28 ± 0.06 Ma and is also represented by a unique squamosal that exhibits a distinct dorsal otic ridge (Rivera-Sylva et al, 2016.…”