TABLE 1. Best partition scheme for Bayesian analysis as obtained from Partition Finder (Lanfear et al., 2012).
| Best model | Subset partitions | Subset sites |
| JTT+G | TTN | 1-1479 |
| JTT+G | CNR1 | 1480-1814 |
| JTT+G | BCHE | 1815-2146 |
| JTT+G | EDG1 | 2147-2466 |
| JTT+G | RAG1 | 2467-3066 |
| JTT+G | RAG2 | 3067-3215 |
| JTT+G | ATP7A | 3216-3444 |
| JTT+G | TYR1 | 3445-3587 |
| JTT+G | Adora3 | 3588-3698 |
| JTT+G | BDNF | 3699-3885 |
| JTT+G | ADRB2 | 3886-4153 |
| JTT+G | PNOC | 4154-4260 |
| JTT+G | A2AB | 4261-4543 |
| JTT+G | BRCA1, BRCA2 | 4544-5574, 5575-7256 |
| JTT+G | APOB, DMP1 | 7257-7710, 9718-10592 |
| JTT+G | GHR | 7711-8026 |
| JTT+G | VWF | 8027-8417 |
| JTT+G | ENAM | 8418-9717 |
| JTT+G | IRBP | 10593-11010 |
| MTMAM+G | Collagen alpha 1 and 2 | 11011-13038 |
| Standard discrete | Morphology | 13039-16698 |
TABLE 2. Skeletal elements of isotemnid specimens from Cañadón Vaca.
| T. externa MPEF-PV 8166 |
T. externa MNHN CAS 844 |
T. externa MNHN CAS 64 |
T. externa AMNH 28698 |
T. externa AMNH 28447 |
T. externa AMNH 28905 |
T. externa AMNH 28563 |
cf. T. externa AMNH 142463 |
A. distentus AMNH 28906 |
A.distentus AMNH 28647 |
P. similis AMNH 28904 |
P. similis AMNH 28635 |
Isotemnidae indet. AMNH 28690 |
|
| Skull | x | x | x | M1 only | |||||||||
| Mandible | x | x | x | ||||||||||
| Scapula | x | x | x | ||||||||||
| Humerus | x | x | x | x | x | ||||||||
| Ulna | x | x | x | x | x | ||||||||
| Radius | x | x | x | x | x | ||||||||
| Manus | x | x | x | ||||||||||
| Pelvis | x | x | |||||||||||
| Femur | x | x | x | x | |||||||||
| Tibia | x | x | x | x | |||||||||
| Pes | x | x | x | x | x |
TABLE 3. Dental measurements of Thomashuxleya; * =taken from Simpson (1967).
| p1 | p2 | p3 | p4 | m1 | m2 | m3 | |||||||||
| Length | Width | Length | Width | Length | Width | Length | Width | Length | Width | Length | Width | Length | Width | ||
| T. rostrata | MACN 10370* | 13.7 | 11.8 | 17.5 | 12.7 | 18.1 | 14.8 | 20.9 | 16.6 | ||||||
| MACN 10539* | 19.9 | 17.8 | 26 | 19.8 | 26.4 | 19.5 | 37.2 | 16.9 | |||||||
| MACN 10546* | 21.5 | 16.8 | |||||||||||||
| AMNH 28692* | 19.5 | 16.5 | 26 | 16.4 | 28.5 | 18.8 | |||||||||
| AMNH 28764* | 21.8 | 13.7 | |||||||||||||
| Mean | 13.7 | 11.8 | 17.5 | 12.7 | 18.8 | 15.7 | 21.0 | 16.2 | 26 | 18.1 | 27.5 | 19.2 | 37.2 | 16.9 | |
| SD | NA | NA | NA | NA | 1.0 | 1.2 | 0.8 | 1.8 | 0.0 | 2.4 | 1.5 | 0.5 | NA | NA | |
| n | 1 | 1 | 1 | 1 | 2 | 2 | 4 | 4 | 2 | 2 | 2 | 2 | 1 | 1 | |
| T. externa | MACN 10540* | 16.5 | 14.6 | 19 | 17.2 | 21 | 28 | 37 | |||||||
| MACN 10537* | 16.3 | 13 | 19.5 | 14 | 23 | 15.5 | |||||||||
| AMNH 28447* | 14.2 | 11.1 | 16.2 | 11.6 | 18.1 | 13 | 22.0 | 15.6 | 27.5 | 16.5 | 31.6 | 15.8 | |||
| AMNH 28697* | 17.3 | 14.2 | 23.2 | 15.9 | 25.5 | 17.2 | 36 | 16.6 | |||||||
| AMNH 28756* | 14.7 | 10.9 | 15.7 | 12.8 | 16.4 | 14.2 | 21.8 | 16.3 | 25.6 | 17.8 | 32.3 | 16.3 | |||
| AMNH 28698* | 11.0 | 10.0 | 15.1 | 12.6 | 16.7 | 13.6 | 16.5 | 14.6 | 24 | 16.1 | 26 | 17.8 | 37 | 17 | |
| AMNH 28686* | 34.5 | 17.0 | |||||||||||||
| AMNH 28822* | 20 | 16.4 | 23 | 18.0 | |||||||||||
| Mean* | 11 | 10 | 14.7 | 11.5 | 16.3 | 13.2 | 17.3 | 14.4 | 21.6 | 15.7 | 25.5 | 17.1 | 34.7 | 16.5 | |
| SD* | NA | NA | 0.5 | 0.9 | 0.4 | 1.3 | 1.1 | 1.5 | 1.6 | 0.9 | 2.0 | 1.0 | 2.4 | 0.5 | |
| n* | 1 | 1 | 3 | 3 | 4 | 4 | 6 | 6 | 7 | 6 | 7 | 7 | 6 | 5 | |
| MPEF-PV 8166 | 12.8 | 8.3 | 15.4 | 10 | 16.5 | 10.1 | 16.4 | 13.3 | 20.1 | 15.6 | 22.5 | 15.3 | 32.3 | 15.7 | |
|
|
P1 | P2 | P3 | P4 | M1 | M2 | M3 | ||||||||
|
|
|
Length | Width | Length | Width | Length | Width | Length | Width | Length | Width | Length | Width | Length | Width |
| T. rostrata | MACN 10370* | 15.4 | 15.7 | 17.0 | 27.2 | 19.5 | 31.2 | 21 | 35 | ||||||
| MACN 10542* | 29.5 | 41.8 | 33.0 | 44.2 | 28.8 | 40.8 | |||||||||
| Mean* | 15.4 | 15.7 | 17 | 27.2 | 19.5 | 31.2 | 21 | 35 | 29.5 | 41.8 | 33 | 44.2 | 28.8 | 40.8 | |
| SD* | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | |
| n* | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | |
| T. externa | MACN 10543* | 24 | 34 | 28.5 | 35.9 | ||||||||||
| AMNH 28699* | 17.5 | 22.1 | 16.8 | 26.4 | 18.5 | 32.1 | 23.8 | 35.8 | 26.7 | 42 | 39.5 | ||||
| AMNH 28757* | 13.8 | 11.5 | 15.2 | 22.1 | 18 | 26 | 25.7 | 27.2 | 39.2 | ||||||
| AMNH 28698* | 10 | 11 | 16 | 18 | 33.2 | 23.9 | 38.7 | 27.2 | 41 | 26 | 41 | ||||
| MNHN CAS 844 | 10.84 | 13.86 | 17.79 | 22.93 | 18.94 | 26.80 | 19.13 | 31.25 | 21.40 | 32.75 | 22.71 | 35.98 | 26.55 | 35.46 | |
| Mean* | 11.5 | 12.1 | 16.8 | 22.4 | 17.4 | 26.4 | 18.5 | 32.2 | 23.8 | 35.3 | 26.5 | 38.8 | 26.3 | 38.7 | |
| SD* | 2.0 | 1.5 | 1.4 | 0.5 | 1.3 | 0.4 | 0.6 | 1.0 | 1.5 | 2.6 | 2.2 | 2.8 | 0.4 | 2.9 | |
| n* | 3 | 3 | 3 | 3 | 4 | 3 | 3 | 3 | 5 | 4 | 5 | 5 | 2 | 3 | |
| MPEF-PV 8166 | 10.2 | 10.5 | 14.0 | 16.2 | 15.0 | 21.6 | 14.6 | 25.9 | 25.2 | 31.3 | 27.9 | 36.9 | 24.0 | 32.0 | |
TABLE 4. Postcranial measurements of MPEF-PV 8166. * Translated from Spanish in Elissamburu (2012).
| Value (mm) |
Acronym | ||||
| Left | Rigth | Scott (1990) |
Elissamburu (2012) |
||
| Scapula | |||||
| Height of the spine | 31.0 | 31.4 | |||
| Humerus | |||||
| Humerus functional length* | 193 | 204 | H1 | LFH | |
| Humerus trochlear diameter* | 52.0 | 43.3 | H4 | DtrH | |
| Maximum length | 211 | 210 | |||
| Maximum diameter of the head | 44.0 | 40.5 | |||
| Maximum diameter of the mayor tuberosity | 46.6 | ||||
| Maximum diameter of the minor tuberosity | 16.6 | ||||
| Maximum widht of the trochlea | 30 | ||||
| Radius | |||||
| Maximum length | 155 | 153 | |||
| Maximum mediolateral width of the medial shaft | 14.1 | 14.0 | |||
| Maximum diameter of the head | 32.0 | ||||
| Minimum diameter of the head | 20.3 | 20.4 | |||
| Maximum diameter of the neck | 20.3 | 19.5 | |||
| Mediolateral width of the distal epiphysis | 36.0 | ||||
| Diameter perpendicular to the maximum width of the distal epiphysis | 31.6 | ||||
| Ulna | |||||
| Anteroposterior diameter of the diaphysis | 28.3 | 28.1 | |||
| Olecraneum height | 64.9 | 63.7 | |||
| Anteroposterior diameter of the oleocranon | 32.6 | ||||
| Proximo-distal length of the trochlear notch | 35.9 | ||||
| Trochlear notch width | 32.6 | ||||
| Width of anconeal process | 20.5 | ||||
| Femur | |||||
| Anteroposterior diameter of the shaft | 25.5 | F7 | DAPF | ||
| Mediolateral diameter of the shaft | 36.2 | F6 | DTF | ||
| Tibia | |||||
| Mediolateral diameter of proximal epiphysis | 55.0 | T2 | DTpT | ||
| Anteroposterior diameter of proximal epiphysis | 44.8 | ||||
| Lateral condyle transverse width | 28.0 | ||||
| Lateral condyle anteroposterior width | 25.0 | ||||
| Astragalus | |||||
| Transverse width of tibial trochlea | 27.7 | Li 1 | |||
| Minimum width of the neck | 14.8 | ||||
| Width sustentacular facet | 17.4 | ||||
| Navicular | |||||
| "Dorsal-plantar" width | 25.6 | ||||
| Astragalar facet transverse width | 24.0 | ||||
| Astragalar facet dorsoventral depth | 25.0 | ||||
| Pelvis | |||||
| Maximum width of the ilium, above the acetabulum | 42.3 | ||||
TABLE 5. Isotemnid astragali measurements in mm.
| Specimen No. | Locality | Maximum length | Trochlear width | Maximum width | Head width |
| MPEF-PV 8166 | Cañadón Vaca | 27.7 | |||
| AMNH 142463 | Cañadón Vaca | 35.9 | 41.4 | ||
| AMNH FM 14501 | "Notostylops beds" | 32.8 | 21.8 | 32.1 | 17.7 |
| AMNH 28690 | Cañadón Vaca | 22 | 12 | 20.6 | |
| AMNH 142464 | Cañadón Vaca | 20.5 | 8.9 | 16.7 | 9.3 |
TABLE 6. Results from the Wilcoxon signed ranks test comparing topologies carried out in PAUP. Meridungulata = constraint with all SANUs within a clade; N/L= Notoungulata (Thomashuxleya, Toxodon) and Litopterna (Macrauchenia, Protolipterna) monophyly constraints for each clade (but not both together); p values greater than 0.05 indicate no difference between optimal and competing topology.
| Topology | Tree length | Rank sums | N | z | p |
| 122374 | (best) | ||||
| N/L | 122391 | 52385.0/--48640.0 | 449 | -0.77 | 0.4390 |
| Meridungulata | 122424 | 214600.5/-193555.5 | 903 | -1.49 | 0.14 |
