APPENDIX 1
Comparative material.
Fossil specimens
Patagornis marshi: MLP 20-157 (ungual phalanx digit IV), MLP 20-164 (ungual phalanx of digit II in Degrange, 2012, and not included in Jones, 2010; however, following the criteria of Jones, 2010, it is assigned here to digit II), MLP 20-85 (ungual phalanx of digit III concurring with Jones, 2010, not assigned to any digit in Degrange 2012), MLP 20-86 (ungual phalanx of digit III, not examined in Jones, 2010 and assigned to digit II in Degrange 2012), MLP 20-184 (ungual phalanx of digit II).
Andrewsornis abbotti: MLP 59-II-26-83 (ungueal phalanx of digit II, not assigned to any digit in Degrange 2012).
Phorusrhacos longissimus: MLP 20-139 (digit III, only as ungual phalanx in Degrange 2012,), MLP 67-VIII-28-1 (digit II) 67-VIII-28-2 (digit III)
Phorusrhacos: MLP 20-572 (ungual pahalanx digit II).
Brontornis burmeisteri: MLP 20-570 (ungual phalanx of digit III).
Psilopterus colzecus: MLP 76-VI-12-2 (ungual phalanx of digits I-IV)
Psilopterinae: MLP 90-III-5-56 (ungual phalanx of digit II), MLP 90-III-5-57 (ungual phalanx of digits III)
Phorusrhacidae: MUSM 351 (ungual phalanx of digit III, taken from Shockey et al., 2009: fig. 4A), MLP 59-II-24-228 (incomplete ungual phalanx), MLP 73-VII-2-10 (badly preserved ungueal phalanx), MLP s/n (field Number 95-159).
Titanis walleri calcotype MNHN s/n (UF 10417)
Extant specimens (ungual phalanges of digit II)
Apteryx haasti: CMC-Av23661
Caracara plancus: MNHN 6390, MNHN 6391
Chunga burmeisteri: MLP ORN 629
Cariama cristata: MNHN 5480, MNHN 6162, MNHN 8260
Casuarius casuarius: MNHT 1813, MACN 53568
Chauna torquata: MNHN 5934, MNHN 5807
Crax fasciolata: MNHT 727
Dromaius novaehollandiae: MHNT 1870
Geranoaetus melanoleucus: MLP ORN 14371
Macronectes giganteus: MNHN 5804, MNHN 5479, MNHN 5804
Otis tarda: MHNT 79
Rhea americana: MLP ORN 1411, MLP ORN 1414, MNHN 6238
Penelope obscura: MHNT 202, MNHN 5669
Tinamus solitarius: MHNT 479, MNHN 6290
Vultur gryphus: MLP ORN 357, MACN 54749
APPENDIX 2
Linear correlation analysis and PCA outputs.
Correlation table for 5 variables. Below the main diagonal are linear correlation coefficients. Upright are the no correlation probability (significant no correlation <0.05. Yellow highlights indicate significant probability of no correlation)
Variable | TL | OCA | LFT | BH | HAF | WAF |
TL | 0 | 0.058487 | 8.52E-06 | 6.88E-09 | 1.55E-06 | 8.50E-08 |
OCA | 0.46746 | 0 | 0.20969 | 0.12486 | 0.069843 | 0.25179 |
LFT | 0.86229 | 0.32055 | 0 | 8.11E-06 | 3.06E-05 | 1.41E-07 |
BH | 0.94851 | 0.38701 | 0.86324 | 0 | 1.60E-07 | 2.01E-08 |
HAF | 0.89153 | 0.4501 | 0.83484 | 0.92081 | 0 | 7.21E-08 |
WAF | 0.92741 | 0.29415 | 0.92221 | 0.94039 | 0.92902 | 0 |
PCA outputs for 6 variables. Jollife cut-off method for significant PC. Yellow highlights indicate a significant PC.
Correlation matrix |
Jollife cut-off: 0.7 | ||
PC | Eigenvalue | % variance | |
1 | 4.90356 | 81.726 | |
2 | 0.848006 | 14.133 | |
3 | 0.11525 | 1.9209 | |
4 | 0.0764382 | 1.274 | |
5 | 0.0346568 | 0.57761 | |
6 | 0.0220869 | 0.36812 |
PCA loadings for 6 variables.
Loadings | Axis 1 | Axis 2 |
TL | 0.9675 | -0.01365 |
OCA | 0.5281 | 0.845 |
LFT | 0.9243 | -0.3058 |
BH | 0.9813 | -0.01997 |
HAF | 0.9645 | 0.05665 |
WAF | 0.97 | -0.1913 |
Correlation table for 4 variables. Below the main diagonal (linear correlation coefficients). Upright the no correlation probability (significant correlation <0.05. Yellow highlights indicate significant probability of no correlation).
Variable | HAF/WAF* | TL/OCA* | TL/LFT* | TL/BH* |
HAF/WAF* | 0 | 0.7679 | 0.49299 | 0.21782 |
TL/OCA* | 0.080164 | 0 | 0.64454 | 0.15355 |
TL/LFT* | 0.1849 | 0.12503 | 0 | 0.21987 |
TL/BH* | -0.32603 | -0.37401 | 0.32466 | 0 |
PCA outputs for 4 variables. Jollife cut-off method for significant PC. Yellow highlights indicate a significant PC.
Correlation matrix | Jollife cut-off: 0.7 | |
PC | Eigenvalue | % variance |
1 | 1.54699 | 38.675 |
2 | 1.21982 | 30.495 |
3 | 0.911681 | 22.792 |
4 | 0.321511 | 8.0378 |
PCA loadings for 4 variables.
Loadings | Axis 1 | Axis 2 | Axis 3 |
HAF/WAF* | 0.5582 | 0.4696 | -0.645 |
TL/OCA* | 0.6441 | 0.2403 | 0.6891 |
TL/LFT* | -0.1898 | 0.9318 | 0.1278 |
TL/BH* | -0.8858 | 0.2709 | 0.0672 |