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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