Table 1. Proximodistal length and proximal and midshaft mediolateral width (mm) of the humerus of the holotype of Notocolossus gonzalezparejasi (UNCUYO-LD 301) compared to those of other titanosaurian sauropods, including other gigantic species.
| Species | Specimen | Length | Width, proximal | Width, midshaft | PHR | Source(s) |
|---|---|---|---|---|---|---|
| Notocolossus gonzalezparejasi | UNCUYO-LD 301 | 1760 | 720 | 250 | 2.88 | this paper |
| Paralititan stromeri | CGM 81119 | 1690 | 562 | 234 | 2.40 | pers. obs. |
| Titanosauria indet. | MMCH NA | 1660 | NA | NA | — | 61 |
| Dreadnoughtus schrani | MPM-PV 1156 | 1600 | 740 | 320 | 2.31 | 4 |
| Futalognkosaurus dukei | MUCPv-323 | 1560 | 600 | 250 | 2.40 | 17; pers. obs. |
| Alamosaurus sanjuanensis | TMM 41541-1 | 1503 | NA | NA | — | 62 |
| Alamosaurus sanjuanensis | USNM 15560 | 1360 | NA | 230 | — | 54 |
| Mendozasaurus neguyelap | IANIGLA-PV 069 | 1060 | 350 | 145 | 2.41 | 9 |
| Opisthocoelicaudia skarzynskii | ZPAL MgD-I/48 | 1000a | 540a | 220a | 2.45 | 18 |
| Epachthosaurus sciuttoi | UNPSJB-PV 920 | 910a | 310a | 163a | 1.90 | 22 |
| Rapetosaurus krausei | FMNH PR 2209 | 524 | 203 | 86 | 2.36 | 13 |
(See Supplementary Table S1 for additional measurements of the Notocolossus humerus.) Specimens are listed by decreasing humeral length. The Notocolossus humerus is the longest yet reported for Titanosauria, and also exhibits the greatest Proximal Humeral Robusticity (i.e., ratio of proximal to midshaft width) value known within this sauropod clade. Abbreviations: NA, not available (i.e., not preserved or not reported); PHR, Proximal Humeral Robusticity. Institutional abbreviations see Supplementary Information. a = measurement averaged from left and right elements of specimen in question; — = calculation not possible based on available data.