Table 3. Size comparisons of MOR 2919 and other selected Brachylophosaurini specimens.
| Taxon | Specimen | Quadrate | Dentary | Tibia | Fibula | Metatarsal II | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Height (cm) | % MOR 794 | Length (cm) | % MOR 794 | Length (cm) | % MOR 794 | Length (cm) | % MOR 794 | Length (cm) | % MOR 794 | ||
| Probrachylophosaurus | MOR 2919 | 37.0 | 114% (adult) | 52.5 | 102% (adult) | 120.0 | 105% (adult) | 112.0 | 109% (adult) | 38.0 | 115% (adult) |
| MOR 1097 | 28.0 (est) | 86% (*76% sub) | - | - | - | - | - | - | - | - | |
| Brachylophosaurus | MOR 794 | 32.5 | 100% (adult) | 51.5 | 100% (adult) | 114.0 | 100% (adult) | 103.0 | 100% (adult) | 33.0 | 100% (adult) |
| FMNH 862 | 32.5 (est) | 92% (adult) | 45.0 | 87% (adult) | - | - | - | - | - | - | |
| MOR 1071 | 32.5 | 100% (adult) | 45.5 | 88% (adult) | 103.5 | 91% (adult) | 94.0 | 91% (adult) | 36.5 | 111% (adult) | |
| MOR 1071 | 21.3 | 66% (sub) | 29.5 | 57% (sub) | 65.0 | 57% (sub) | 64.5 | 63% (sub) | 23.5 | 71% (sub) | |
The value “% MOR 794” indicates the specimen’s size relative to that of MOR 794, the largest Brachylophosaurus canadensis, and its categorization as adult or subadult based solely on its size, not its histological maturity; those specimens 50–85% the size of MOR 794 are considered subadults [26]. The size of MOR 1097 is also given relative to MOR 2919 (*76%), which categorizes MOR 1097 as a subadult. The height of incomplete quadrates was estimated; the quadrate of FMNH is nearly complete, and is a similar size to that of MOR 794. The MOR 1097 quadrate estimate was based on the width of the ventral condyle, which scales linearly with height (R2 = 0.999) in these specimens. Because MOR 1071 specimens are from a disarticulated bonebed, most bones cannot be associated together as specific individuals. For each element, the largest specimen and a representative subadult specimen were included here. Field numbers of MOR 1071 specimens, largest followed by smaller for each element: quadrates, 8-13-98-559D, 6-30-98-1; dentaries, 8-98-X (part of skull 7-7-98-86), 8-1-99-313; tibiae, 672-L, 8-10-98-514; fibulae, 7-7-98-88, 7-23-99-181; metatarsal IIs, 7-19-99-131B, 8-7-99-470. Abbreviations: est, estimated; sub, subadult.