Prieto-Márquez and Gutarra—Hadrosaurid dinosaurs from Careless Creek Quarry (Montana)
noted in the literature (Dilkes, 2001; Godefroit et al., 2004; Grigorescu and Csiki, 2006; Brett-Surman and Wagner, 2007; Guenther, 2014; Prieto-Márquez, 2014b). Specifically, the CCQ juveniles show overall less robust humeri, with relatively less expanded deltopectoral crests and less prominent distal condyles; however, Guenther (2014) found no substantial ontogenetic increase in the development of the condyles in the saurolophine Maiasaura peeblesorum Horner and Makela, 1979. These differences are evident when comparing ANSP 15979 with adult humeri such as, for example, that of Prosaurolophus maximus TMP 84.1.1 (Fig. 3.10, 3.11). Prieto-Márquez (2014b) noted the lack of an angular laterodistal corner of the deltopectoral crest in a juvenile Edmontosaurus annectens (LACM 23504). It is interesting to note that angularity of the lateroventral corner of the deltopectoral crest in the CCQ humerus is comparable to that of adult hadrosaurids such as the aforementioned P. maximus TMP 84.1.1. In agreement with previous observations on the ontoge-
netic variation of hadrosauroid tibiae (Dilkes, 1996; Grigorescu and Csiki, 2006; Brett-Surman and Wagner, 2007; Prieto-Márquez, 2011b, 2014b; Guenther, 2014), the tibia of the juvenile ANSP 15979 shows a more slender shaft and caudo- laterally less expanded cnemial crest and internal condyles (Fig. 3.9) than adult hadrosaurid specimens such as, for exam- ple, Prosaurolophus maximus ROM 787 (Fig. 3.12). Although limited by the lack of lower taxonomic com-
parative context, contrasting these observations with those documented in the literature evidences that, while generally many osteological attributes appear to change in a consistent manner through hadrosaurid ontogeny, other character growth changes vary among taxa.
Acknowledgments
We thank T. Daeschler for providing high-resolution photo- graphs of the pelvic bones and neonate specimens from the CCQ housed at the ANSP. We are grateful to T. Gates and an anonymous reviewer for insightful comments on an earlier draft of the manuscript. This study was funded by a Marie Curie Intra-European Fellowship for Career Development (European Commission) presented to APM.
Accessibility of supplemental data
Data available from the Dryad Digital Repository: http://data
dryad.org/handle/doi:10.5061/dryad.4km97
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