TABLE 1. List and geometric properties of species used in the present study. Diet following (Redford, 1985). Abbreviations preceding the names of institutions are used to identify the location of specimens: AMNH, American Museum of Natural History, New York, USA; FMNH, Field Museum of Natural History, Chicago, USA; MNCN, Museo Nacional de Ciencias Naturales, Madrid, Spain; MNHN, Muséum National d’Histoire Naturalle, Paris, France; ZMB, Zoologisches Museum, Berlin, Germany; MLP, Museo de la Plata, La Plata, Argentina. The data of Eutatus seguiniis is a reconstruction based on Vizcaíno and Bargo (1998).

Taxon Diet Collection number Thickness
 (mm)
Model area
 [mm2]
Masseter area
[mm2]
Temporalis area
 [mm2]
Masseter Force
 [N]
Temporalis Force
 [N]
Priodontes maximus Specialist insectivore AMNH 208104 6.41 2051.70 616.02 255.06 1.29 0.53
Cabassous unicinctus 1 Specialist insectivore MNHN 1953/457 3.51 415.75 112.08 22.91 0.37 0.08
Cabassous unicinctus 2 Specialist insectivore ZMB 5913 4.60 813.05 182.24 30.86 0.70 0.12
Cabassous unicinctus 3 Specialist insectivore ZMB 37799 4.48 698.77 21.75 12.27 0.70 0.04
Tolypeutes matacus 1 Generalist insectivore AMNH 246460 3.56 497.40 157.01 64116.00 0.35 0.14
Tolypeutes matacus 2 Generalist insectivore ZMB 47083 3.97 316.81 94.09 32.51 0.33 0.11
Dasypus kappleri Generalist insectivore MNHN 1995/207 3.51 971.37 105.37 153.18 0.28 0.41
Dasypus sabanicola Generalist insectivore ZMB 85899 2.78 527.86 150.66 71545.00 0.27 0.13
Dasypus novemcinctus 1 Generalist insectivore AMNH 133338 2.94 613.54 225.77 92174.00 0.32 0.13
Dasypus novemcinctus 2 Generalist insectivore ZMB 38343 2.93 819.33 283.15 49.13 0.45 0.08
Dasypus novemcinctus 3 Generalist insectivore ZMB 31703 3.19 882.19 295.67 65.74 0.49 0.11
Chlamyphorus truncatus Generalist insectivore ZMB 4321 2.00 113.19 16035.00 34006.00 0.04 0.09
Macroeuphractus outesi Omnivore/ Carnivore MLP 69-IX-9-3 25.97 11750.00 5328.00 1455.90 13.89 3.79
Chaetophractus villosus Omnivore/ Carnivore MNCN 2538 4.94 1038.90 300.58 156.08 0.66 0.34
Chaetophractus vellerosus Omnivore/ Carnivore MLP 18.XI.99.9 3.68 538.80 145.04 117.03 0.30 0.24
Euphractus sexcinctus Omnivore/ Carnivore MNHN 1917/13 5.66 1019.20 331.22 190.60 0.72 0.41
Zaedyus pichiy Omnivore/ Carnivore MLP 9.XII.2.10 3.51 327.35 89737.00 66091.00 0.23 0.17
Vassallia maxima Herbivore FMNH 14424 25.97 4620.30 2208.40 140.23 10.43 0.66
Eutatus seguini Herbivore Reconstruction 13.74 3517.90 890.49 551.23 3.16 1.96

 

TABLE 2. Statistics for the Kruskal-Wallis test: Arithmetic Mean (AM), Mesh-Weighted Arithmetic Mean (MWAM), Median (M) and Mesh-Weighted Median (MWM).

  Kruskal-Wallis H Kruskal-Wallis p-value Pairwise test p-value: Bonferroni non-corrected / corrected
Specialist Insectivore vs Generalist Insectivore Specialist Insectivore vs Omnivore Generalist Insectivore vs Omnivore
AM 9.429 0.0089 0.8197 / 1 0.0369 / 0.1107 0.0058 / 0.0173
MWAM 9.429 0.0089 0.8197 / 1 0.0369 / 0.1107 0.0058 / 0.0173
M 9.587 0.0072 0.3619 / 1 0.0368 / 0.1107 0.0058 / 0.0173
MWM 9.589 0.0081 0.5676 / 1 0.0358 / 0.1073 0.0057 / 0.0170

 

TABLE 3. Values for the descriptive statistics Arithmetic Mean (AM) and Median (M) of the Von Mises Stress Distribution in each of the 20 Cingulate mandible.

Taxon Nodes AM
[MPa]
MWAM
[MPa]
M
[MPa]
MWM
[MPa]
PEofAM
[%]
PEofM
[%]
Priodontes maximus 34850 0.024369 0.024416 0.020965 0.021166 0.19 0.95
Cabassous unicinctus 1 20223 0.019407 0.019715 0.016175 0.015493 1.56 4.40
Cabassous unicinctus 2 147443 0.021900 0.021400 0.018200 0.018600 2.43 2.15
Cabassous unicinctus 3 133183 0.018900 0.019000 0.015300 0.014700 0.79 3.94
Tolypeutes matacus 1 24202 0.017281 0.017435 0.014982 0.014603 0.89 2.59
Tolypeutes matacus 2 132946 0.016500 0.016700 0.014100 0.013500 0.72 4.56
Dasypus kappleri 45523 0.023298 0.023447 0.021266 0.020468 0.64 3.90
Dasypus sabanicola 25174 0.022948 0.023036 0.022615 0.021783 0.38 3.82
Dasypus novemcinctus 1 29249 0.022644 0.022692 0.022301 0.021585 0.21 3.32
Dasypus novemcinctus 2 133983 0.025400 0.025300 0.023100 0.022300 0.15 3.76
Dasypus novemcinctus 3 187208 0.026300 0.026200 0.021800 0.021200 0.13 2.77
Chlamyphorus truncatus 48577 0.013004 0.013131 0.009605 0.009309 0.96 3.19
Macroeuphractus outesi 61435 0.012038 0.011881 0.009044 0.008903 1.32 1.59
Chaetophractus villosus 50126 0.013269 0.013519 0.010344 0.009984 1.85 3.60
Chaetophractus vellerosus 26309 0.012094 0.012253 0.009270 0.008934 1.30 3.77
Euphractus sexcinctus 48517 0.014003 0.014263 0.010759 0.010404 1.83 3.41
Zaedyus pichiy 136253 0.015548 0.015669 0.012378 0.011875 0.77 4.24
Vassallia maxima 65549 0.009714 0.009635 0.008301 0.008054 0.83 3.06
Eutatus seguini 76191 0.014400 0.014449 0.011008 0.010713 0.34 2.75