Table 2. Proximodistal lengths (mm) of the metatarsals of the referred specimen of Notocolossus gonzalezparejasi (UNCUYO-LD 302) compared to those of other titanosauriform sauropods.

Species	Specimen	I	II	III	IV	V	III/I	IV/I	V/III	V/IV	Source
Notocolossus gonzalezparejasi	UNCUYO-LD 302	164	185	197	218	196	1.20	1.33	0.99	0.90	this paper
Mendozasaurus neguyelap	IANIGLA-PV 077	140	156	178	205	165	1.27	1.46	0.93	0.81	9
Opisthocoelicaudia skarzynskii	ZPAL MgD-I/48	150	180	200	180	140	1.33	1.20	0.70	0.78	18
Agua del Padrillo titanosaur	UNCUYO-LD 313	109	138	146	152	130	1.34	1.39	0.89	0.86	this paper
?Alamosaurus sanjuanensis	NMMNH P-49967	195	245	270	291	281	1.38	1.49	1.04	0.97	28
Euhelopus zdanskyi	PMU 234	98	122	136	121	NA	1.39	1.23	—	—	52
La Invernada titanosaur	MUCPv-1533	120	137	168	172	127	1.40	1.43	0.76	0.74	24
Bonitasaura salgadoi	MPCA 460	120	154	169	180	142	1.41	1.50	0.84	0.79	64
Rapetosaurus krausei	FMNH PR 2209	63	82	89	88	59	1.41	1.40	0.66	0.67	13
Epachthosaurus sciuttoi	UNPSJB-PV 920	125	153	177	185	153	1.42	1.48	0.86	0.83	22
Tastavinsaurus sanzi	MPZ 99/9	162	190	230	212	180	1.42	1.31	0.78	0.85	65
Ligabuesaurus leanzai	MCF-PVPH-233	140	190	220	220	180	1.57	1.57	0.82	0.82	27
Antarctosaurus wichmannianus	MACN-PV 6904	140	200	225	215	—	1.61	1.54	—	—	63
Dreadnoughtus schrani	MPM-PV 1156	210	250	NA	NA	NA	—	—	—	—	4
Cedarosaurus weiskopfae	FMNH PR 977	120	200	165*	NA	200	—	—	—	—	31

(See Supplementary Table S3 for additional measurements of the Notocolossus metatarsus.) Specimens are listed by increasing metatarsal III to metatarsal I length ratio. Note that (1) although probable, it is not certain that all metatarsals of Mendozasaurus specimen IANIGLA-PV 077 pertain to a single individual⁹, and (2) although Huene⁶³:73 provided a length measurement (120 mm) for a purported metatarsal V of the Antarctosaurus wichmannianus holotype, this element may actually represent metatarsal I of another individual; as such, we have omitted this measurement here. Abbreviations: I–V, metatarsal number; III/I, metatarsal III to metatarsal I length ratio; IV/I, metatarsal IV to metatarsal I length ratio; V/III, metatarsal V to metatarsal III length ratio; V/IV, metatarsal V to metatarsal IV length ratio; NA, not available (i.e., element not preserved or measurement not reported). Institutional abbreviations see Supplementary Information. * = element incomplete, measurement as preserved; — = calculation not possible based on available data.