. The Canadian field-naturalist. Natural history; Sciences naturelles. Figure 4. Dimorphic overlapping material of (A) CMN 2245 and (B) CMN 2280. i. right and left humeri: ii right and left sternal plates; iii posterior thoracic vertebrae in anterior (left) and left lateral (right) views. Note that, because of the poor preservation of the overlapping vertebrae, the eighth thoracic \ertebra is figured for CMN 2245 and the tenth thoracic vertebra is figured for CMN 2280. Scale bar = 10 cm. A Reevaluation of Sexual Dimorphism in Chasmosaurus belli Recognizing sexual dimorphism in a fossil species
. The Canadian field-naturalist. Natural history; Sciences naturelles. Figure 4. Dimorphic overlapping material of (A) CMN 2245 and (B) CMN 2280. i. right and left humeri: ii right and left sternal plates; iii posterior thoracic vertebrae in anterior (left) and left lateral (right) views. Note that, because of the poor preservation of the overlapping vertebrae, the eighth thoracic \ertebra is figured for CMN 2245 and the tenth thoracic vertebra is figured for CMN 2280. Scale bar = 10 cm. A Reevaluation of Sexual Dimorphism in Chasmosaurus belli Recognizing sexual dimorphism in a fossil species is rarely a straightforward task, especially given small sample sizes where subtle but statistically significant dimorphic characters are difficult to resolve (Padian et al. 2005). Chinner>- (2001. 2004) attempted to discern morphological variation, including sexual dimorphism, in the appendicular skeleton of the Ceratopsia. but could find none. The dimorphism originalh ascribed by Sternberg (1927) to CMN 2245 and CNIN 2280 was presumably based on variation in the postcranial skele-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
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